External Link : https://uec-hirata.net/en/index.html

工学博士, 東京農工大学

光化学、有機光エレクトロニクス、分子フォトニクス

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment

Nanotechnology/Materials, Organic functional materials

Nanotechnology/Materials, Functional solid-state chemistry

Nanotechnology/Materials, Basic physical chemistry

Jun. 2021 - Present
The University of Electro-Communications, Graduate School of Informatics and Engineering, School of Informatics and Engineering Department of Engineering Science, Cluster III(Fundamental Science and Engineering), Associate Professor

01 Jun. 2021
The University of Electro-Communications, Department of Engineering Science, Associate Professor

01 Jan. 2018 - 31 May 2021
The University of Electro-Communications, Department of Engineering Science, Assistant Professor

Jan. 2018 - May 2021
The University of Electro-Communications, Graduate School of Informatics and Engineering, School of Informatics and Engineering Department of Engineering Science, Cluster III(Fundamental Science and Engineering), Assistant Professor

01 Apr. 2016 - 31 Dec. 2017
Tokyo Institute of Technology, Department of Materials Science, Assistant Professor

01 Sep. 2012 - 31 Mar. 2016
Tokyo Institute of Technology, Department of Organic and Polymeric Materials, Assistant Professor

01 Sep. 2012 - 31 Mar. 2016
東京工業大学 有機・高分子物質専攻, 助教

01 Apr. 2012 - 31 Aug. 2012
Kyushu University, Center for Organic Photonics and Electronics Research (OPERA), Research Assistant Professor

01 Apr. 2012 - 31 Aug. 2012
同, 特プロ助教

01 Apr. 2010 - 31 Mar. 2012
Kyushu University, Center for Organic Photonics and Electronics Research (OPERA), Research Assistant Professor

01 Apr. 2010 - 31 Mar. 2012
九州大学 最先端有機光エレクトロニクス研究センター, 特任助教

01 Apr. 2009 - 31 Mar. 2010
Kyushu University, Center for Future Chemistry, Post Doctral Fellow

01 Apr. 2004 - 30 Sep. 2006
株式会社フジクラ, 材料技術研究所

01 Apr. 2006 - 31 Mar. 2009
東京農工大学, 工学府, 応用化学専攻

01 Apr. 2002 - 31 Mar. 2004
東京農工大学, 工学研究科, 応用化学専攻

01 Apr. 1998 - 31 Mar. 2002
東京農工大学, 工学部, 応用化学科

Apr. 2024 - Present
日本化学会関東支部幹事

Jan. 2023 - Dec. 2023
Guest Editor in PNAS, https://www.pnas.org/guest-editor/acknowledgments#section-h

Apr. 2022 - Mar. 2023
光化学若手の会 世話人代表

Jul. 2021 - Jun. 2022
Guest Editor of Frontiers in Chemistry, Frontiers, Others

Sep. 2021 - Mar. 2022
第102回春季年会(2022)の第10回ルミネッセンス化学アンサンブル: 未来のサイエンスに向けた多様な励起化学企画委員

Jan. 2016 - Jun. 2016
有機EL討論会実行委員, 有機EL討論会実行委員, Others

Apr. 2023
The Royal Society of Chemistry
2023 Pioneering Investigator in Chemical Communications, Shuzo Hirata

Jan. 2023
American Chemical Society
2023 Early-Career and Emerging Researcher in The Journal of Physical Chemistry, Shuzo Hirata

Apr. 2019
平成31年度科学技術分野の文部科学大臣表彰 若手科学者賞, 平田修造

Nov. 2018
The Royal Society of Chemistry
2018 Emerging Investigator in Journal of Materials Chemistry C, Shuzo Hirata
Official journal

Sep. 2017
Japanese Photochemistry Association
17th The Japanese Photochemistry Association Award for Young Scientist, Shuzo Hirata

Mar. 2016
Chemical Society Japan
65th Chemical Society Japan (CSJ) Award for Young Chemists, Shuzo Hirata

Apr. 2015
日本化学会
日本化学会第95回春季年会優秀講演賞（学術）, Shuzo Hirata

Mar. 2015
Chemical Society Japan
29th Young Scholar Lectures of Chemical Society Japan (CSJ), Shuzo Hirata

Oct. 2013
2013年度化学･生物素材研究開発奨励賞, 平田修造

May 2013
第2回新化学技術研究奨励賞, 平田修造

Mar. 2011
2010年度(秋季)応用物理学会講演奨励賞, 平田修造

May 2010
日本化学会第90回春季年会講演奨励賞（産業）, 平田修造

May 2010
日本化学会第90回春季年会優秀講演賞（学術）, 平田修造

Jun. 2009
Pan-Pacific Imaging Conference '08コニカミノルタ研究奨励賞, 渡辺敏行、平田修造

May 2006
日本化学会第86回春季年会講演奨励賞（産業）, 平田修造

Vertical substitution strategy to enable cooperation between spin–orbit coupling and transition dipoles for organic phosphorescence
Kikuya Hayashi; Riku Shimura; Ryo Miyashita; Shuzo Hirata
Last, Nature Communications, Springer Science and Business Media LLC, 17 Mar. 2026, Peer-reviwed, Abstract

The emission from organic molecules can be broadly classified as fluorescence or phosphorescence, and it is used in a wide range of applications from optoelectronics to bioimaging. The common method to enhance the fluorescence from organic chromophores is to introduce horizontal substituents into long conjugated structures. However, this concept does not allow the phosphorescence efficiency in the visible range to be increased to the fluorescence efficiency. Here we introduce a molecular design of conjugated molecules that effectively cooperate spin-orbit and transition dipoles. Increasing the through-space substitution of main-group elements perpendicular to the conjugated plane produces a cooperative effect of the spin–orbit and large transition dipoles of the conjugated plane to enhance the organic phosphorescence. This molecular design, which is different from the fluorescence, will increase the efficiency of the organic phosphorescence to the same level as the fluorescence at all visible wavelengths.
Scientific journal

Oxygen quantification based on the persistent phosphorescence lifetime of host–guest nanocrystals
Riku Shimura; Kikuya Hayashi; Sakuya Ueda; Rana Tsuru; Shuzo Hirata
Last, ACS Materials Letters, 7, 6, 2049-2055 (Supplementary Cover), 28 Apr. 2025, Peer-reviwed
Scientific journal, English

Selective lower-occupied through-bond interactions for efficient organic phosphorescence enabling high-resolution long-wavelength afterglow
Rajashekhar K. Mulimani; Sakuya Ueda; Ryo Miyashita; Rana Tsuru; Kikuya Hayashi; Riku Shimura; Bahadur Sk; Shinji Matsuda; Shuzo Hirata
Last, Advanced Materials, 37, 27, 2502611 (Back Cover), 24 Apr. 2025, Peer-reviwed
Scientific journal, English

Synchronizing the nπ* Transition Dipole in a Benzoyl-Linked N-Fused Ring for Highly Efficient Yellow Afterglow
Bahadur Sk; Riku Shimura; Kazuki Fujita; Shuzo Hirata
Last, The Journal of Physical Chemistry Letters, American Chemical Society (ACS), 3904-3910, 10 Apr. 2025, Peer-reviwed
Scientific journal

Deciphering carbon–sulfur rotational distribution in a crystalline host for enhanced red persistent organic phosphorescence
Sakuya Ueda; Kazuki Fujita; Bahadur Sk; Shuzo Hirata
Last, Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), 13, 6, 2654-2660 (Front Cover), 12 Dec. 2024, Peer-reviwed, A collaborative synthesis and computational approach is used to decipher confined carbon–sulfur rotational distribution in a crystalline host for enhanced red persistent phosphorescence.
Scientific journal

Symmetry-Breaking Triplet Excited State Enhances Red Afterglow Enabling Ubiquitous Afterglow Readout
Bahadur Sk; Shuzo Hirata
Last, Advanced Science, 11, 14, 2308897, 04 Feb. 2024, Peer-reviwed
Scientific journal

High‐Resolution Afterglow Patterning Using Cooperative Vapo‐ and Photo‐Stimulation
Kikuya Hayashi; Shuzo Hirata
Last, Small, Wiley, 20, 16, 2308103, 28 Nov. 2023, Peer-reviwed
Scientific journal

Continuous Condensed Triplet Accumulation for Irradiance‐Induced Anticounterfeit Afterglow
Ende Hopsah Badriyah; Kikuya Hayashi; Bahadur Sk; Rina Takano; Takayuki Ishida; Shuzo Hirata
Last, Advanced Science, Wiley, 10, 2304374, 28 Oct. 2023, Peer-reviwed, Abstract

Afterglow room‐temperature emission that is independent of autofluorescence after ceasing excitation is a promising technology for state‐of‐the‐art bioimaging and security devices. However, the low brightness of the afterglow emission is a current limitation for using such materials in a variety of applications. Herein, the continuous formation of condensed triplet excitons for brighter afterglow room‐temperature phosphorescence is reported. (S)‐(‐)‐2,2′‐Bis(diphenylphosphino)‐1,1′‐binaphthyl ((S)‐BINAP) incorporated in a crystalline host lattice showed bright green afterglow room‐temperature phosphorescence under strong excitation. The small triplet–triplet absorption cross‐section of (S)‐BINAP in the whole range of visible wavelengths greatly suppressed the deactivation caused by Förster resonance energy transfer from excited states of (S)‐BINAP to the accumulated triplet excitons of (S)‐BINAP under strong continuous excitation. The steady–state concentration of the triplet excitons for (S)‐BINAP reached 2.3 × 10⁻² M, producing a bright afterglow. Owing to the brighter afterglow, afterglow detection using individual particles with sizes approaching the diffraction limit in aqueous conditions and irradiance‐dependent anticounterfeiting can be achieved.
Scientific journal

Photoinduced Triplet Depletion Allowing Higher-Resolution Afterglow
Kikuya Hayashi; Keiki Fukumoto; Shuzo Hirata
Last, ACS Materials Letters, 5, 1649-1655, May 2023, Peer-reviwed
Scientific journal

Förster resonance energy transfer involving the triplet state
Bahadur Sk; Shuzo Hirata
Last, Chemical Communications, 59, 6643-6659 (Invited Future Article), Apr. 2023, Peer-reviwed, Invited
Scientific journal, English

Role of Carbonyl Distortions Facilitating Persistent Room-Temperature Phosphorescence
Shuzo Hirata*, Takuya Kamatsuki
Lead, The Journal of Physical Chemistry C, 127, 7, 3861-3871 (Invited Article), Jan. 2023, Peer-reviwed, Invited, False
Scientific journal, English

Selective Triplet-Singlet Förster-Resonance Energy Transfer for Bright Red Afterglow Emission
Bahadur Sk; Rana Tsuru; Kikuya Hayashi; Shuzo Hirata
Last, Advanced Functional Materials, 33, 11, 2211604, Dec. 2022, Peer-reviwed
Scientific journal, English

Enhanced Red Persistent Room-Temperature Phosphorescence Induced by Orthogonal Structure Disruption during Electronic Relaxation
Kei Fukasawa; Yuma Sugawara; Rana Tsuru; Takashi Yamashita; Shuzo Hirata
Last, The Journal of Physical Chemistry Letters, 13, 33, 7788-7796 (Invited Article), Aug. 2022, Peer-reviwed, Invited
Scientific journal, English

Editorial: Metal-Free Room-Temperature Phosphorescence
Shuzo Hirata; Sebastian Reineke; Abhijit Patra; Wan Zhang Yuan
Lead, Frontiers in Chemistry, 10, 1025674, Aug. 2022, Peer-reviwed, Invited
Scientific journal, English

A Rational Key of Triplet Afterglow Sensitizer Allowing Bright Long-Wavelength Afterglow Room-Temperature Emission
Kikuya Hayashi; Kei Fukasawa; Takashi Yamashita; Shuzo Hirata
Last, Chemistry of Materials (Supplementary Cover), 34, 1627-1637, Jan. 2022, Peer-reviwed
Scientific journal, English

Molecular physics of persistent room-temperature phosphorescence and long-lived triplet excitons
Shuzo Hirata
Lead, Applied Physics Reivews, 9, 011304 (Invited Article), Jan. 2022, Peer-reviwed, Invited
Scientific journal, English

Thermo-Reversible Persistent Phosphorescence Modulation Reveals the Large Contribution Made by Rigidity to the Suppression of Endothermic Intermolecular Triplet Quenching
Tomoya Kusama; Shuzo Hirata
Last, Frontiers in Chemistry, 7, 788577, Oct. 2021, Peer-reviwed, Invited
Scientific journal, English

高輝度長寿命室温りん光の高解像空間変調媒体への応用
平田修造
化学工業, 株式会社化学工業社, 72, 6, 357-362, Jun. 2021, Invited
Research society, Japanese

Key of Suppressed Triplet Nonradiative Transition-Dependent Chemical Backbone for Spatial Self-Tunable Afterglow
Indranil Bhattacharjee; Kikuya Hayashi; Shuzo Hirata
Last, JACS Au (Front Cover Picture), 1, 945-954, May 2021, Peer-reviwed
Scientific journal, English

Vibrational Radiationless Transition from Triplet States of Chromophores at Room Temperature
Shuzo Hirata; Indranil Bhattacharjee
Lead, The Journal of Physical Chemistry A, 125, 3, 885-894, Jan. 2021, Peer-reviwed
Scientific journal, English

Chiral Approach to Investigate Mechanism of Highly Efficient Thermally Activated Delayed Fluorescence
Kikuya Hayashi; Arimasa Matsumoto; Shuzo Hirata
Last, Chemical Communications, Royal Society of Chemistry (RSC), 57, 14, 1738-1741, Jan. 2021, Peer-reviwed,

Cancellation of the Cotton effect depending on vibrations of a chiral orthogonal donor–acceptor structure identifies a mechanism of highly efficient delayed fluorescence.

Scientific journal, English

Phosphorescence Quenching of Heavy-Atom-Free Dopant Chromophores Triggered by Thermally Activated Triplet Exciton Diffusion of a Conjugated Crystalline Host
Shuzo Hirata; Hyuman Hara; Indranil Bhattacharjee
Lead, JOURNAL OF PHYSICAL CHEMISTRY C, 124, 45, 25121-25132, Nov. 2020, Peer-reviwed
Scientific journal, English

The Substituent-Induced Symmetry-Forbidden Electronic Transition Allows Significant Optical Limiting under Weak Sky-Blue Irradiance
Takuya Kamatsuki; Indranil Bhattacharjee; Shuzo Hirata
Last, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 11, 20, 8675-8681, Oct. 2020, Peer-reviwed
Scientific journal, English

Energy localization vs. charge funneling in aggregates of CsPbBr(3 )perovskite nanocrystals
Dharmendar Kumar Sharma; Shuzo Hirata; Martin Vacha
JOURNAL OF LUMINESCENCE, 222, 117119, Jun. 2020, Peer-reviwed
Scientific journal, English

Highly Efficient Persistent Room‐Temperature Phosphorescence from Heavy Atom‐Free Molecules Triggered by Hidden Long Phosphorescent Antenna
Indranil Bhattacharjee; Shuzo Hirata
Last, Advanced Materials, 32, 2001348, Jun. 2020, Peer-reviwed
Scientific journal, English

Effect of the Tris(trimethylsilyl)silyl Group on the Fluorescence and Triplet Yields of Oligothiophenes
Shuzo Hirata; Masaki Nishio; Hikaru Uchida; Tsukasa Usuki; Toyotaka Nakae; Mariko Miyachi; Yoshinori Yamanoi; Hiroshi Nishihara
Lead, JOURNAL OF PHYSICAL CHEMISTRY C, 124, 5, 3277-3286, Feb. 2020, Peer-reviwed
Scientific journal, English

Single-particle electroluminescence of CsPbBr3 perovskite nanocrystals reveals particle-selective recombination and blinking as key efficiency factors
Dharmendar Kumar Sharma; Shuzo Hirata; Martin Vacha
NATURE COMMUNICATIONS, 10, 4499, Oct. 2019, Peer-reviwed
Scientific journal, English

Roles of Localized Electronic Structures Caused by pi Degeneracy Due to Highly Symmetric Heavy Atom-Free Conjugated Molecular Crystals Leading to Efficient Persistent Room-Temperature Phosphorescence
Shuzo Hirata
Lead, ADVANCED SCIENCE, 6, 14, 1900410, Jul. 2019, Peer-reviwed
Scientific journal, English

Suppressed Triplet Exciton Diffusion Due to Small Orbital Overlap as a Key Design Factor for Ultralong-Lived Room-Temperature Phosphorescence in Molecular Crystals
Kaishi Narushima; Yasuhiro Kiyota; Takehiko Mori; Shuzo Hirata; Martin Vacha
Corresponding, ADVANCED MATERIALS, 31, 10, 1807268, Mar. 2019, Peer-reviwed
Scientific journal, English

A colorless semi-aromatic polyimide derived from a sterically hindered bromine-substituted dianhydride exhibiting dual fluorescence and phosphorescence emission
Kenta Kanosue; Shuzo Hirata; Martin Vacha; Ramunas Augulis; Vidmantas Gulbinas; Ryohei Ishige; Shinji Ando
MATERIALS CHEMISTRY FRONTIERS, 3, 1, 39-49, Jan. 2019, Peer-reviwed
Scientific journal, English

Stark Effect and Environment-Induced Modulation of Emission in Single Halide Perovskite Nanocrystals
Dharmendar Kumar Sharma; Shuzo Hirata; Vasudevanpillai Biju; Martin Vacha
ACS NANO, 13, 1, 624-632, Jan. 2019, Peer-reviwed
Scientific journal, English

Wavelength-Tunable Band-Edge Photoluminescence of Nonstoichiometric Ag-In-S Nanoparticles via Ga3+ Doping
Tatsuya Kameyama; Marino Kishi; Chie Miyamae; Dharmendar Kumar Sharma; Shuzo Hirata; Takahisa Yamamoto; Taro Uematsu; Martin Vacha; Susumu Kuwabata; Tsukasa Torimoto
ACS APPLIED MATERIALS & INTERFACES, 10, 49, 42844-42855, Dec. 2018, Peer-reviwed
Scientific journal, English

Efficient triplet-triplet annihilation upconversion in binary crystalline solids fabricated via solution casting and operated in air (vol 4, pg 83, 2017)
Kenji Kamada; Yusuke Sakagami; Toshiko Mizokuro; Yutaka Fujiwara; Kenji Kobayashi; Kaishi Narushima; Shuzo Hirata; Martin Vacha
MATERIALS HORIZONS, 5, 6, 1219-1219, Nov. 2018, Peer-reviwed
English

Ultralong-lived room temperature triplet excitons: molecular persistent room temperature phosphorescence and nonlinear optical characteristics with continuous irradiation
Shuzo Hirata
Lead, JOURNAL OF MATERIALS CHEMISTRY C, 6, 44, 11785-11794, Nov. 2018, Peer-reviwed, Invited
Scientific journal, English

Identification of Short- and Long-Wavelength Emitting Chlorophylls in Cyanobacterial Photosystem I by Plasmon-Enhanced Single-Particle Spectroscopy at Room Temperature
Soya Hatazaki; Dharmendar Kumar Sharma; Shuzo Hirata; Keiji Nose; Tomokazu Iyoda; Adrian Koelsch; Heiko Lokstein; Martin Vacha
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9, 22, 6669-6675, Nov. 2018, Peer-reviwed
Scientific journal, English

Intrinsic Analysis of Radiative and Room-Temperature Nonradiative Processes Based on Triplet State Intramolecular Vibrations of Heavy Atom-Free Conjugated Molecules toward Efficient Persistent Room-Temperature Phosphorescence
Shuzo Hirata
Lead, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9, 15, 4251-4259, Aug. 2018, Peer-reviwed
Scientific journal, English

Narrow band-edge photoluminescence from AglnS(2) semiconductor nanoparticles by the formation of amorphous III-VI semiconductor shells
Taro Uematsu; Kazutaka Wajima; Dharmendar Kumar Sharma; Shuzo Hirata; Takahisa Yamamoto; Tatsuya Kameyama; Martin Vacha; Tsukasa Torimoto; Susumu Kuwabata
NPG ASIA MATERIALS, 10, 713-726, Aug. 2018, Peer-reviwed
Scientific journal, English

Large refractive index variations induced by accumulating triplet excitons under photoexcitation at low power
Tomoe Hori; Kenro Totani; Shuzo Hirata; Toshiyuki Watanabe
CHEMICAL PHYSICS LETTERS, 704, 5-10, Jul. 2018, Peer-reviwed
Scientific journal, English

Excited State Behavior of Single Strand and Bulk P3HT in Contact with a Au-Nanowire Array
Mengdi Liu; Shuzo Hirata; Tomokazu Iyoda; Martin Vacha; Piotr Piotrowiak
JOURNAL OF PHYSICAL CHEMISTRY C, 122, 14, 7925-7933, Apr. 2018, Peer-reviwed
Scientific journal, English

Intrachain Aggregates as the Origin of Green Emission in Polyfluorene Studied on Ensemble and Single-Chain Level
Tomonori Nakamura; Dharmendar Kumar Sharma; Shuzo Hirata; Martin Vacha
JOURNAL OF PHYSICAL CHEMISTRY C, 122, 15, 8137-8146, Apr. 2018, Peer-reviwed
Scientific journal, English

Single-molecule studies beyond optical imaging: Multi-parameter single-molecule spectroscopy
Martin Vacha; Dharmendar Kumar Sharma; Shuzo Hirata
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS, 34, 121-136, Mar. 2018, Peer-reviwed, Invited
Scientific journal, English

Macrocyclic poly(p-phenylenevinylene)s by ring expansion metathesis polymerisation and their characterisation by single-molecule spectroscopy
Benjamin John Lidster; Shuzo Hirata; Shoki Matsuda; Takuya Yamamoto; Venukrishnan Komanduri; Dharam Raj Kumar; Yasuyuki Tezuka; Martin Vacha; Michael L. Turner
CHEMICAL SCIENCE, 9, 11, 2934-2941, Mar. 2018, Peer-reviwed
Scientific journal, English

Plasmon Enhancement of Triplet Exciton Diffusion Revealed by Nanoscale Imaging of Photochemical Fluorescence Upconversion
Lukasz Bujak; Kaishi Narushima; Dharmendar Kumar Sharma; Shuzo Hirata; Martin Vacha
JOURNAL OF PHYSICAL CHEMISTRY C, 121, 45, 25479-25486, Nov. 2017, Peer-reviwed
Scientific journal, English

Recent Advances in Materials with Room-Temperature Phosphorescence: Photophysics for Triplet Exciton Stabilization
Shuzo Hirata
Lead, ADVANCED OPTICAL MATERIALS, 5, 17, 1700116, Sep. 2017, Peer-reviwed
Scientific journal, English

Large Reverse Saturable Absorption at the Sunlight Power Level Using the Ultralong Lifetime of Triplet Excitons
Shuzo Hirata; Martin Vacha
Lead, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 8, 15, 3683-3689, Aug. 2017, Peer-reviwed
Scientific journal, English

Nanoscale triplet exciton diffusion via imaging of up-conversion emission from single hybrid nanoparticles in molecular crystals
Kaishi Narushima; Shuzo Hirata; Martin Vacha
Corresponding, NANOSCALE, 9, 30, 10653-10661, Aug. 2017, Peer-reviwed
Scientific journal, English

White Afterglow Room-Temperature Emission from an Isolated Single Aromatic Unit under Ambient Condition
Shuzo Hirata; Martin Vacha
Lead, ADVANCED OPTICAL MATERIALS, 5, 5, Mar. 2017, Peer-reviwed
Scientific journal, English

Influence of Zn on the photoluminescence of colloidal (AgIn)(x)Zn2(1-x) S-2 nanocrystals
Dharmendar Kumar Sharma; Shuzo Hirata; Lukasz Bujak; Vasudevanpillai Biju; Tatsuya Kameyama; Marino Kishi; Tsukasa Torimoto; Martin Vacha
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19, 5, 3963-3969, Feb. 2017, Peer-reviwed
Scientific journal, English

Photo-Functional Materials with Ultralong Exciton Lifetime Using Super Rigid Molecular Hosts
HIRATA SHUZOU
Sen'i Gakkaishi, The Society of Fiber Science and Technology, Japan, 73, 9, P-336-P-341, 2017
Japanese

Efficient triplet-triplet annihilation upconversion in binary crystalline solids fabricated: Via solution casting and operated in air
Kenji Kamada; Yusuke Sakagami; Toshiko Mizokuro; Yutaka Fujiwara; Kenji Kobayashi; Kaishi Narushima; Shuzo Hirata; Martin Vacha
Materials Horizons, Royal Society of Chemistry, 4, 1, 83-87, 01 Jan. 2017, Peer-reviwed
Scientific journal, English

Selective turn-on and modulation of resonant energy transfer in single plasmonic hybrid nanostructures
Lukasz Bujak; Tatsuya Ishii; Dharmendar Kumar Sharma; Shuzo Hirata; Martin Vacha
NANOSCALE, 9, 4, 1511-1519, Jan. 2017, Peer-reviwed
Scientific journal, English

Efficient triplet-triplet annihilation upconversion in binary crystalline solids fabricated via solution casting and operated in air
Kenji Kamada; Yusuke Sakagami; Toshiko Mizokuro; Yutaka Fujiwara; Kenji Kobayashi; Kaishi Narushima; Shuzo Hirata; Martin Vacha
MATERIALS HORIZONS, 4, 1, 83-87, Jan. 2017, Peer-reviwed
Scientific journal, English

High-throughput virtual screening
Shuzo Hirata; Katsuyuki Shizu
Lead, NATURE MATERIALS, 15, 10, 1056-1057, Oct. 2016, Peer-reviwed, Invited
English

分子性室温りん光と三重項の光物理化学
平田修造
光化学協会誌, 光化学協会, 47, 2, 84-91, Sep. 2016, Invited
Research society, Japanese

Circularly Polarized Persistent Room-Temperature Phosphorescence from Metal-Free Chiral Aromatics in Air
Shuzo Hirata; Martin Vacha
Lead, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7, 8, 1539-1545, Apr. 2016, Peer-reviwed
Scientific journal, English

Large Transmittance Change Induced by Exciton Accumulation under Weak Continuous Photoexcitation
Shuzo Hirata; Martin Vacha
Lead, ADVANCED OPTICAL MATERIALS, 4, 2, 297-305, Feb. 2016, Peer-reviwed
Scientific journal, English

Single-particle spectroscopy of I-III-VI semiconductor nanocrystals: spectral diffusion and suppression of blinking by two-color excitation
Dharmendar Kumar Sharma; Shuzo Hirata; Lukasz Bujak; Vasudevanpillai Biju; Tatsuya Kameyama; Marino Kishi; Tsukasa Torimoto; Martin Vacha
NANOSCALE, 8, 28, 13687-13694, 2016, Peer-reviwed
Scientific journal, English

Photoreversible On-Off Recording of Persistent Room-Temperature Phosphorescence
Yuki Katsurada; Shuzo Hirata; Kenro Totani; Toshiyuki Watanabe; Martin Vacha
Corresponding, ADVANCED OPTICAL MATERIALS, 3, 12, 1726-1737, Dec. 2015, Peer-reviwed
Scientific journal, English

Super-resolution localization microscopy reveals nanoscale dynamics of polymers and soft matter
Shuzo Hirata; Syoji Ito; Martin Vacha; Hiroshi Miyasaka
Kobunshi, 64, 9, 575-577, Sep. 2015
Scientific journal

Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy
Tatsuya Fukushima; Junichi Yamamoto; Masashi Fukuchi; Shuzo Hirata; Heo Hyo Jung; Osamu Hirata; Yuki Shibano; Chihaya Adachi; Hironori Kaji
AIP ADVANCES, 5, 8, Aug. 2015, Peer-reviwed
Scientific journal, English

Position-Dependent Three-Dimensional Diffusion in Nematic Liquid Crystal Monitored by Single-Particle Fluorescence Localization and Tracking
Seonik Lee; Koushi Noda; Shuzo Hirata; Martin Vacha
Journal of Physical Chemistry Letters, 6, 8, 1403-1407, Apr. 2015, Peer-reviwed
Scientific journal, English

Highly efficient blue electroluminescence based on thermally activated delayed fluorescence
Shuzo Hirata; Yumi Sakai; Kensuke Masui; Hiroyuki Tanaka; Sae Youn Lee; Hiroko Nomura; Nozomi Nakamura; Mao Yasumatsu; Hajime Nakanotani; Qisheng Zhang; Katsuyuki Shizu; Hiroshi Miyazaki; Chihaya Adachi
Lead, NATURE MATERIALS, 14, 3, 330-336, Mar. 2015, Peer-reviwed
Scientific journal, English

Meta-linking strategy for thermally activated delayed fluorescence emitters with a small singlet-triplet energy gap
Katsuyuki Shizu; Yumi Sakai; Hiroyuki Tanaka; Shuzo Hirata; Chihaya Adachi; Hironori Kaji
ITE Transactions on Media Technology and Applications, Institute of Image Information and Television Engineers, 3, 2, 108-113, 2015, Peer-reviwed
Scientific journal, English

Long-lived Triplet Excitons Allowed by Intermolecular Hydrogen Bonding in Amorphous Matrix
Yuichiro Tsubomoto; Shuzo Hirata; Kenro Totani; Martin Vacha; Toshiyuki Watanabe
Corresponding, JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY, 28, 4, 573-577, 2015, Peer-reviwed
Scientific journal, English

Thermally activated delayed fluorescence with circularly polarized luminescence characteristics
Takuro Imagawa; Shuzo Hirata; Kenro Totani; Toshiyuki Watanabe; Martin Vacha
Corresponding, CHEMICAL COMMUNICATIONS, 51, 68, 13268-13271, 2015, Peer-reviwed
Scientific journal, English

Large reverse saturable absorption under weak continuous incoherent light
Shuzo Hirata; Kenro Totani; Takashi Yamashita; Chihaya Adachi; Martin Vacha
Lead, NATURE MATERIALS, 13, 10, 938-946, Oct. 2014, Peer-reviwed
Scientific journal, English

Circularly polarized luminescence from individual microstructures of conjugated polymer aggregates with solvent-induced chirality
Kenta Katayama; Shuzo Hirata; Martin Vacha
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16, 33, 17983-17987, Sep. 2014, Peer-reviwed
Scientific journal, English

Single-molecule electroluminescence and photoluminescence of polyfluorene unveils the photophysics behind the green emission band
Yoshihiro Honmou; Shuzo Hirata; Hideaki Komiyama; Junya Hiyoshi; Susumu Kawauchi; Tomokazu Iyoda; Martin Vacha
NATURE COMMUNICATIONS, 5, 938-946, Aug. 2014, Peer-reviwed
Scientific journal, English

Bacteriochlorophyll Aggregates Self-Assembled on Functionalized Gold Nanorod Cores as Mimics of Photosynthetic Chlorosomal Antennae: A Single Molecule Study
Shu Furumaki; Frantisek Vacha; Shuzo Hirata; Martin Vacha
ACS NANO, 8, 3, 2176-2182, Mar. 2014, Peer-reviwed
Scientific journal, English

Relationship between room temperature phosphorescence and deuteration position in a purely aromatic compound
S. Hirata; K. Totani; T. Watanabe; H. Kaji; M. Vacha
Lead, CHEMICAL PHYSICS LETTERS, 591, 119-125, Jan. 2014, Peer-reviwed
Scientific journal, English

Mechanical Manipulation of Photophysical Properties of Single Conjugated Polymer Nanoparticles
Hiroyuki Kobayashi; Shuzo Hirata; Martin Vacha
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 4, 15, 2591-2596, Aug. 2013, Peer-reviwed
Scientific journal, English

Efficient Persistent Room Temperature Phosphorescence in Organic Amorphous Materials under Ambient Conditions
Shuzo Hirata; Kenro Totani; Junxiang Zhang; Takashi Yamashita; Hironori Kaji; Seth R. Marder; Toshiyuki Watanabe; Chihaya Adachi
Lead, ADVANCED FUNCTIONAL MATERIALS, 23, 27, 3386-3397, Jul. 2013, Peer-reviwed
Scientific journal, English

Reversible Thermal Recording Media Using Time-Dependent Persistent Room Temperature Phosphorescence
Shuzo Hirata; Kenro Totani; Hironori Kaji; Martin Vacha; Toshiyuki Watanabe; Chihaya Adachi
Lead, ADVANCED OPTICAL MATERIALS, 1, 6, 438-442, Jun. 2013, Peer-reviwed
Scientific journal, English

Energy Transfer: Thermoresponsive Persistent Phosphorescent Color Change Using Efficient Thermally Activated Reverse Energy Transfer with a Large Energy Difference (Advanced Optical Materials 4/2013)
Kenro Totani; Yuya Okada; Shuzo Hirata; Martin Vacha; Toshiyuki Watanabe
Advanced Optical Materials, 1, 4, 282-282, Apr. 2013, Peer-reviwed
Scientific journal, English

Thermoresponsive Persistent Phosphorescent Color Change Using Efficient Thermally Activated Reverse Energy Transfer with a Large Energy Difference
Kenro Totani; Yuya Okada; Shuzo Hirata; Martin Vacha; Toshiyuki Watanabe
Corresponding, ADVANCED OPTICAL MATERIALS, 1, 4, 283-288, Apr. 2013, Peer-reviwed
Scientific journal, English

Efficient Persistent Room Temperature Phosphorescence in Organic Materials
Shuzo Hirata; Chihaya Adachi; Toshiyuki Watanabe; Kenro Totani
Lead, KOBUNSHI RONBUNSHU, 70, 11, 623-636, 2013, Peer-reviwed
Scientific journal, Japanese

Reversible Coloration Enhanced by Electrochemical Deposition of an Ultrathin Zinc Layer onto an Anodic Nanoporous Alumina Layer
Shuzo Hirata; Toshiro Tsuji; Yoshimine Kato; Chihaya Adachi
Lead, ADVANCED FUNCTIONAL MATERIALS, 22, 20, 4195-4201, Oct. 2012, Peer-reviwed
Scientific journal, English

Uniform and refreshable liquid electroluminescent device with a back side reservoir
Chang-Hoon Shim; Shuzo Hirata; Juro Oshima; Tomohiko Edura; Reiji Hattori; Chihaya Adachi
APPLIED PHYSICS LETTERS, 101, 11, 283-288, Sep. 2012, Peer-reviwed
Scientific journal, English

Liquid Carbazole Substituted with a Poly(ethylene oxide) Group and Its Application for Liquid Organic Light-emitting Diodes
Korefumi Kubota; Shuzo Hirata; Yuki Shibano; Osamu Hirata; Masayuki Yahiro; Chihaya Adachi
CHEMISTRY LETTERS, 41, 9, 934-936, Sep. 2012, Peer-reviwed
Scientific journal, English

Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
Qisheng Zhang; Jie Li; Katsuyuki Shizu; Shuping Huang; Shuzo Hirata; Hiroshi Miyazaki; Chihaya Adachi
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 134, 36, 14706-14709, Sep. 2012, Peer-reviwed
Scientific journal, English

Improved Device Lifetime of Organic Light Emitting Diodes with an Electrochemically Stable pi-Conjugated Liquid Host in the Liquid Emitting Layer
Shuzo Hirata; Hyo Jung Heo; Yuki Shibano; Osamu Hirata; Masayuki Yahiro; Chihaya Adachi
Lead, JAPANESE JOURNAL OF APPLIED PHYSICS, 51, 4, 14706-14709, Apr. 2012, Peer-reviwed
Scientific journal, English

Self-refreshable lighting device using liquid oled material
Chang-Hoon Shim; Shuzo Hirata; Juro Oshima; Tomohiko Edura; Reiji Hattori; Chihaya Adachi
Digest of Technical Papers - SID International Symposium, Blackwell Publishing Ltd, 43, 1, 1542-1543, 2012
International conference proceedings, English

MICROFLUIDIC ORGANIC LIGHT EMITTING DIODE (OLED) USING LIQUID ORGANIC SEMICONDUCTORS
T. Kasahara; J. Mizuno; S. Hirata; T. Edura; S. Matsunami; C. Adachi; S. Shoji
2012 IEEE 25TH INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS), 1069-1072, 2012, Peer-reviwed
International conference proceedings, English

Improvement of Electroluminescence Performance of Organic Light-Emitting Diodes with a Liquid-Emitting Layer by Introduction of Electrolyte and a Hole-Blocking Layer
Shuzo Hirata; Korefumi Kubota; Heo Hyo Jung; Osamu Hirata; Kenichi Goushi; Masayuki Yahiro; Chihaya Adachi
Lead, ADVANCED MATERIALS, 23, 7, 889-+, Feb. 2011, Peer-reviwed
Scientific journal, English

Enhanced figure of merit of a porous thin film of bismuth antimony telluride
Makoto Kashiwagi; Shuzo Hirata; Kentaro Harada; Yanqiong Zheng; Koji Miyazaki; Masayuki Yahiro; Chihaya Adachi
APPLIED PHYSICS LETTERS, 98, 2, 14706-14709, Jan. 2011, Peer-reviwed
Scientific journal, English

Investigation of Quenching Mechanism in Thermoreversible Fluorescent Recording Materials of Fluorescence Using Thermochromic Fluorescence Resonance Energy Transfer
Shuzo Hirata; Martin Vacha; Toshiyuki Watanabe
Lead, JAPANESE JOURNAL OF APPLIED PHYSICS, 49, 5, 889-+, May 2010, Peer-reviwed
Scientific journal, English

高輝度有機蓄光材料と感熱型蓄光記録素子の開発
渡辺敏行; 平田修造
WEBジャーナル, 99, 29-33, Apr. 2009, Peer-reviwed
Scientific journal, Japanese

Reversible Fluorescent On-Off Recording in a Highly Transparent Polymeric Material Utilizing Fluorescent Resonance Energy Transfer (FRET) Induced by Heat Treatment
Shuzo Hirata; Kwang-Sup Lee; Toshiyuki Watanabe
Lead, ADVANCED FUNCTIONAL MATERIALS, 18, 19, 2869-2879, Oct. 2008, Peer-reviwed
Scientific journal, English

Reversible thermoresponsive on-off recording of fluorescence and long lived room temperature phosphorescence in organic materials /Next-generation advanced materials for security technology
S. Hirata; T. Watanabe
Lead, Proceeding of Pan-Pacific Imaging Conference, 1069-1072, Jun. 2008
International conference proceedings, English

Reversible thermoresponsive recording of fluorescent images (TRF)
Shuzo Hirata; Toshiyuki Watanabe
Lead, ADVANCED MATERIALS, 18, 20, 2725-+, Oct. 2006, Peer-reviwed
Scientific journal, English

ホストゲスト有機分子結晶からの 高輝度室温りん光と高解像アフターグロー
平田修造
Lead, Mar. 2024, 超分子アニュアルレビュー (公益社団法人 高分子学会 超分子研究会), 44, Japanese, Invited, Introduction other

明るい環境下でも視認可能な高輝度蓄光分子
平田修造
株式会社加工技術研究会, Dec. 2020, コンバーテック, 573, 48, 91-94, Japanese, Introduction commerce magazine

高解像蓄光イメージングを可能にする高輝度長寿命室温りん光分子
平田修造
株式会社オプトロニクス社, Nov. 2020, OPTRONICS, 467, 11, 200-204, Japanese, Introduction commerce magazine

Role of Suppressed Triplet Exciton Diffusion of pi-Aggregated Molecular Materials for Ultralong-Lived Room Temperature Phosphorescence
Shuzo Hirata
May 2019, SEN-I GAKKAISHI, 75, 5, P253-P257, Japanese, 0037-9875, WOS:000474324000005

超剛直有機媒体による芳香族分子の励起子蓄積機能を利用した光機能性材料
平田修造
繊維学会, Oct. 2017, 繊維学会紙, 79, 3, 336-341, Japanese, Invited, Introduction commerce magazine

重ハロゲンの立体効果による凝集状態制御を基盤とした高透明・室温燐光性ポリイミド
鹿末健太; 平田修造; VACHA Martin; 安藤慎治
2017, 高分子学会予稿集(CD-ROM), 66, 1, 201702218380863037

かさ高い電子供与性置換基を導入したフタルイミド化合物の蛍光特性制御
折田良司; 鹿末健太; 平田修造; VACHA Martin; 石毛亮平; 安藤慎治
2017, 高分子学会予稿集(CD-ROM), 66, 1, 201702259323535384

High-throughput virtual screening
Shuzo Hirata; Katsuyuki Shizu
Oct. 2016, NATURE MATERIALS, 15, 10, 1056-1057, English, Peer-reviwed, Invited, Introduction commerce magazine, 1476-1122, 1476-4660, WOS:000384677100005

Large nonlinear absorption under weak continuous incoherent light
平田 修造
コスメトロジー研究振興財団, 2016, コスメトロジー研究報告, 24, 43-52, Japanese, 2188-563X, 40020954778, AA11571370

室温長寿命励起子を利用した光機能材料の創製
平田修造
日本化学会, Nov. 2015, 化学と工業11月号, 575-577, Japanese, Invited, Introduction commerce magazine

非点収差を用いた高分子の三次元ダイナミックス評価
平田修造; 伊都庄司; バッハマーティン; 宮坂博
高分子学会, Sep. 2015, 高分子, 575-577, Japanese, Invited, Introduction commerce magazine

長い励起状態を利用した光機能性材料
平田修造
シーエムシー出版, Apr. 2015, 月刊機能材料, 35, 4, 41-48, Japanese, Invited, Introduction commerce magazine, 0286-4835, 40021171742, AN00360069

Degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance
Junichi Yamamoto; Masashi Fukuchi; ○Tatsuya Fukushima; Shuzo Hirata; Heo Hyo Jung; Osamu Hirata; Yuki Shibano; Chihaya Adachi; Hironori Kaji
Sep. 2012, International Conference on Electroluminescence & Organic Optoelectronics, Fukuoka, Japan, English, Peer-reviwed

背面貯蔵型液体ELデバイス
SHIM Chang-Hoon; SHIM Chang-Hoon; 平田修造; 大島寿郎; 大島寿郎; 江面知彦; 服部励治; 服部励治; 安達千波矢
2012, 応用物理学関係連合講演会講演予稿集(CD-ROM), 59th, 201202293383784454

液体有機半導体における材料劣化のNMR解析
山本順一; 福地将志; 福島達也; 平田修造; ホ ヒョジョン; 平田修; 柴野佑紀; 安達千波矢; 梶弘典
Nov. 2011, 有機EL討論会 第13回例会，大阪, Japanese, Peer-reviwed

Material degradations in liquid organic semiconductors analyzed by solution NMR
Junichi Yamamoto; Masashi Fukuchi; Tatsuya Fukushima; Shuzo Hirata; Heo Hyo Jung; Osamu Hirata; Yuki Shibano; Chihaya Adachi; Hironori Kaji
Nov. 2011, Asian Conference on Organic Electronics, Taipei, Taiwan, English, Peer-reviwed

Long-lived Phosphorescent Color Change with Temperature Increase : Inter-molecular thermally activated triplet-triplet energy transfer
TOTANI Kenro; OKADA Yuya; HIRATA Shuzo; WATANABE Toshiyuki
A significant long-lived phosphorescent color change with temperature increase using efficient inter-molecular thermally activated energy transfer was observed. The materials are a host-guest compound composed of secondary amino substituted aromatic carbons as a guest, phosphorescent iridium complex as a guest, and amorphous steroid compound as a host matrix. The phosphorescent color was gradually changed with increasing temperature from red in low temperature region at 77 K to green in room temperature region at 300 K. The red color was originated from aromatic carbons and the green color was originated from iridium complex, resulting from thermally activated energy transfer with temperature increase., The Institute of Electronics, Information and Communication Engineers, 11 Oct. 2011, Technical report of IEICE. OME, 111, 236, 7-8, Japanese, 110008900295, AN10013334

NMRによる有機EL分子の配向および劣化解析
梶弘典; 福島達也; 福地将志; 山本順一; 藤村昴; 八尋正幸; 平田修造; HEO Hyo Jung; 平田修; 柴野佑紀; 安達千波矢
11 Mar. 2011, 日本化学会講演予稿集, 91st, 1, 5, Japanese, 0285-7626, 201102221984915760

NMRによる液体有機半導体の劣化解析
山本順一; 福島達也; 福地将志; 平田修造; HEO Hyo Jung; 平田修; 柴野佑紀; 安達千波矢; 梶弘典
09 Mar. 2011, 応用物理学関係連合講演会講演予稿集(CD-ROM), 58th, ROMBUNNO.26P-BD-2, Japanese, 201102273763414651

MNM-4A-5 Thermoelectric thin film deposition on a porous alumina
KASHIWAGI Makoto; Zheng Yanqiong; HIRATA Shuzo; HARADA Kentaro; MIYAZAKI Koji; YAHIRO Masayuki; ADACHI Chihaya
A nano-porous thin film of p-type Bismuth-Telluride with an enhanced figure of merit of 1.8 at room temperature was fabricated by flash evaporation on an alumina substrate containing hexagonally arranged nano-pores with an average diameter of 20 nm, separated by an average of 50 nm. The thermal conductivity was significantly reduced compared with standard Bismuth-Telluride films to 0.25 [W/(m・k)] with no major decrease in either the electrical conductivity (398 [S/cm]) or the Seebeck coefficient (198 [μV/K]). The reduction in thermal conductivity was roughly explained using a full distribution model of the phonon mean free path, The Japan Society of Mechanical Engineers, 12 Oct. 2010, マイクロ・ナノ工学シンポジウム, 2010, 2, 179-180, Japanese, 110008743277, AA12456946

Material's design concept for organic highly efficient long lived room temperature phosphorescence by decreasing nonradiative process at excited triplet state
TOTANI Kenro; HIRATA Shuzo; WATANABE Toshiyuki; ADACHI Chihaya
Long lived room temperature phosphorescence (LL-RTP) is not observed under the atmosphere in organic materials since active thermal motion of dye and matrix quenches a long exited triplet state of dyes at RT and oxygen accelerates electron quenching in an excited triplet state of dyes due to triplet-triplet energy transfer from a dye to oxygen. Therefore, it has been reported that long excited lifetime more than second order and efficient long lived phosphorescence are usually observed when some organic dyes dispersed into matrix is frozen to 77 K. Here we report that aromatic carbons substituted with strong electron donors dispersed homogeneously into amorphous steroid compounds show highly efficient LL-RTP under the atmosphere., The Institute of Electronics, Information and Communication Engineers, 20 May 2010, IEICE technical report, 110, 59, 51-53, Japanese, 0913-5685, 110008001569, AN10013334

【96】常温有機蓄光体の開発とデバイスへの応用展開
平田 修造; 戸谷 健朗; Junzhang Zhang; 山下 俊; 渡辺 敏行; Seth Richard Marder; 梶 弘典; 安達 千波矢
12 Nov. 2009, 有機EL討論会 第9回例会 ,京都大学 宇治キャンパス おうばくプラザ, Japanese, Peer-reviwed

【67】熱による有機化合物の凝集変化を利用した蛍光や蓄光情報の可逆的なOn-Off 記録特性
平田修造; 渡辺敏行; 梶弘典
20 Jun. 2008, 繊維学会 平成20年度年次大会 ,東京, Japanese, Peer-reviwed

Reversible thermoresponsive on-off recording of strong long lived room temperature phosphorescence in organic materials under atmosphere
Hirata S; Sesei T; Kaji H; Yamashita T; Watanabe T
18 May 2008, International Conference on Organic Photonics and Electronics 2008 (ICOPE2008) ,Santa Fe, New Mexico, USA, English, Peer-reviwed

【59】感熱記録による有機材料の常温蓄光機能および蛍光機能のOn-Off制御
平田修造; 瀬々井巌士; 梶弘典; 山下隆志; 渡辺敏行
27 Mar. 2008, 日本化学会第88回春季年会 アドバンスト・テクノロジー・プログラム(ATP) シンポジウム ,東京, Japanese, Peer-reviwed

感熱型蛍光記録材料
渡辺敏行; 平田修造
2008, 工業材料, 56, 1, 82-83

感熱型蛍光記録材料
渡辺敏行; 平田修造
日刊工業新聞, Jan. 2008, 工業材料, 1, 83-84, Japanese, Invited, Introduction commerce magazine

Migration-proof membrane circuits for fine-pitch connector
S. Hirata; A. Ono; Y. Kurosawa; Y. Oyama; M. Chiba
Oct. 2006, Fujukura Technical Review, 36, 25-29, English, Technical report

Single-Molecule Level Study and Control of Collective Photosynergetic Responses in Molecules and Molecular Aggregates; Photoresponse in Molecular Complexes and Related Systems
Martin Vacha; Shuzo Hirata
Scholarly book, English, Joint work, Springer, Singapore, Sep. 2020

環状高分子の合成と機能発現
平田修造; バッハマーティン
Scholarly book, Japanese, Joint work, 第5章 単一分子分光法による環状共役高分子の コンフォメーションおよび励起状態の解析, シーエムシー出版, Nov. 2018

先端有機半導体デバイス―基礎からデバイス物性まで
平田修造
Dictionary or encycropedia, Japanese, Joint work, 常温りん光, オーム社, Jan. 2015

光化学の事典
平田修造
Dictionary or encycropedia, Japanese, Joint work, 第2章, 2項, 長寿命発光-遅延発光の原理, 朝倉書店, 2014

導電性ポリマー材の高機能化と用途開発最前線
平田修造; 羽渕聡志; バッハマーティン
General book, Japanese, Joint work, 第2章, 第2節, 共役系高分子のコンフォメーションと光物性, シーエムシー出版, 2014

有機光半導体デバイスの物性
平田修造
General book, Japanese, Joint work, 電荷再結合領域(pp.107-109), 励起子相互作用(pp.109-117), 金属非含有型常温りん光材料(pp.269-273), 講談社, 2012

CSJ Current Review 07, 高分子と光が織りなす新機能・新物性
渡辺敏行; 平田修造
General book, Japanese, Joint work, 感熱型蛍光記録材料, Part II、Chapter 10, 日本化学会, 2011

カルコゲン–カルコゲン相互作用を活用した広域酸素マッピングを可能にする有機りん光分子の開発
上田 朔也; 志村 理玖; 林 希久也; 宮下 凌羽; 奥山 晃希; 平田 修造
Oral presentation, Japanese, 日本化学会第106春季年会(2026)
19 Mar. 2026
17 Mar. 2026- 20 Mar. 2026

サンドイッチ型セレン-縮環芳香族炭化水素-セレン構造による有機りん光の増強
宮下 凌羽; 志村 理玖; 林 希久也; 平田 修造
Oral presentation, Japanese, 日本化学会第106春季年会(2026)
18 Mar. 2026
17 Mar. 2026- 20 Mar. 2026

スルースペース相互作用を誘起する置換基の小型化に伴う有機りん光の増強
奥山 晃希; 平田 修造
Oral presentation, Japanese, 日本化学会第106春季年会(2026)
18 Mar. 2026
17 Mar. 2026- 20 Mar. 2026

Selenium induced through-bond interactions to enable efficient deep red organic room temperature phosphorescence
Rajashekhar K. Mulimani; Kikuya Hayashi; Shuzo Hirata
Oral presentation, English, 日本化学会第106春季年会(2026)
17 Mar. 2026
17 Mar. 2026- 20 Mar. 2026

垂直型スルースペース置換基による有機りん光過程の増強効果
林 希久也; 志村 理玖; 宮下 凌羽; 平田 修造
Oral presentation, Japanese, 日本化学会第106春季年会(2026)
17 Mar. 2026
17 Mar. 2026- 20 Mar. 2026

Unique π-Molecular Design to Enhance Organic Phosphorescence for High-Resolution Afterglow Imaging
Shuzo Hirata
Invited oral presentation, English, The 106th CSJ Annual Meeting, Invited
17 Mar. 2026
17 Mar. 2026- 20 Mar. 2026

A collaborative experimental and computational approach for the discovery of enhanced organic phosphorescent molecules
Shuzo Hirata
Invited oral presentation, English, The 817th MANA Seminar, Invited
23 Jan. 2026
23 Jan. 2026- 23 Jan. 2026

有機りん光を増強するπ発色団と典型元素間の スルーボンド・スルースペース相互作用
平田修造
Invited oral presentation, 第6回 IRCCSフォーラム産学共創ワークショップ, Invited
14 Jan. 2026
14 Jan. 2026- 14 Jan. 2026

High-resolution afterglow imaging using enhanced organic phosphorescence nanoparticles
Shuzo Hirata
Invited oral presentation, 1st DGU Conference of Advanced Energy and Materials Technology, Invited
18 Nov. 2025

酸素濃度で長寿命りん光減衰が変化する結晶ミセルの低速酸素拡散挙動
志村理玖; 林希久也; 平田修造
Oral presentation, 第74回高分子討論会
16 Sep. 2025

硫黄-セレン間スルースペース相互作用を有するπ分子の長寿命有機りん光の増強
上田 朔也; Bahadur Sk; 平田 修造
Poster presentation, 第35回基礎有機化学討論会
11 Sep. 2025

Long-lived phosphorescent analysis visualizes ultraslow oxygen diffusion capability in individual nanocrystals
Riku Shimura; Kikuya Hayashi; Shuzo Hirata
Poster presentation, Annual Meeting on Photochemistry 2025
04 Sep. 2025

Selective through bond interactions in the lower-occupied orbitals for efficient organic phosphorescence to enable high-resolution red afterglow
Rajashekhar Mulimani Kashipati; Sakuya Ueda; Ryo Miyashita; Riku Shimura; Kikuya Hayashi; Shuzo Hirata
Oral presentation, Annual Meeting on Photochemistry 2025
04 Sep. 2025

Oxygen quantification based on the persistent phosphorescence lifetime of host−guest nanocrystals
Riku Shimura; Kikuya Hayashi; Shuzo Hirata
Poster presentation, 32nd International Conference on Photochemistry (ICP2025)
15 Jul. 2025

Deciphering carbon–sulfur rotational distribution in a crystalline host for enhanced red persistent organic phosphorescence
Sakuya Ueda; Kazuki Fujita; Bahadur Sk; Shuzo Hirata
Poster presentation, 32nd International Conference on Photochemistry (ICP2025)
15 Jul. 2025

Selective Lower-Occupied Through-Bond Interactions for Efficient Organic Phosphorescence in Long Wavelength
Shuzo Hirata
Oral presentation, 32nd International Conference on Photochemistry (ICP2025)
15 Jul. 2025

第16族元素と縮環芳香族炭化水素の分子内スルースペース結合を用いた赤色有機りん光の増強
宮下凌羽; 平田修造
Poster presentation, 第49回有機電子移動化学討論会
27 Jun. 2025

赤色長寿命室温りん光を活用した分子のC-S回転分布解析
上田朔也; Mulimani K. Rajashekhar; 平田修造
Poster presentation, 第49回有機電子移動化学討論会
27 Jun. 2025

ナノ結晶からの長寿命りん光の酸素消光を利用した高速二次元酸素濃度計測
志村理玖; 林希久也; 平田修造
Poster presentation, 第49回有機電子移動化学討論会
27 Jun. 2025

Through bond interactions specific to lower occupied orbitals for enabling efficient long-wavelength organic phosphorescence
Rajashekhar K. Mulimani; Sakuya Ueda; Ryo Miyashita; Riku Shimura; Kikuya Hayashi; Shuzo Hirata
Poster presentation, 第49回有機電子移動化学討論会
27 Jun. 2025

Microparticulation of molecular crystals to enhance oxygen sensing capability based on long-lived phosphorescence lifetime
Riku Shimura; Kikuya Hayashi; Shuzo Hirata
Japanese, The 105th CSJ Annual Meeting
29 Mar. 2025
26 Mar. 2025- 29 Mar. 2025

Role of through-space interaction for enhancing long-wavelength organic phosphorescence
Ryo Miyashita; Rajashekhar Kashipati Mulimani; Shuzo Hirata
Oral presentation, Japanese, The 105th CSJ Annual Meeting
29 Mar. 2025
26 Mar. 2025- 29 Mar. 2025

Host-induced site-selective vibrational suppression of a π-molecule revealed by extensive phosphorescence analysis
Rana Tsuru; Sakuya Ueda; Shuzo Hirata
Oral presentation, Japanese, The 105th CSJ Annual Meeting
29 Mar. 2025
26 Mar. 2025- 29 Mar. 2025

Enhanced red persistent room-temperature phosphorescence using a phenylthio substituent
Sakuya Ueda; Kazuki Fujita; Bahadur Sk; Shuzo Hirata
Oral presentation, Japanese, The 105th CSJ Annual Meeting
26 Mar. 2025
26 Mar. 2025- 29 Mar. 2025

Predicted Organic Phosphorescence Performance Considering Molecular Vibrations
Shuzo Hirata
Invited oral presentation, English, 12th Singapore International Chemical Conference (SICC-12), Invited
11 Dec. 2024
09 Dec. 2024- 13 Dec. 2024

Selenium induced through-bond interactions to enable efficient deep red organic room temperature phosphorescence
平田修造
Invited oral presentation, Japanese, 第3回IRCCSフォーラム産学共創WS, Invited
13 Nov. 2024
13 Nov. 2024- 13 Nov. 2024

Enhanced red persistent room-temperature phosphorescence using a phenylthio substituent
Sakuya UEDA; Bahadur SK; Shuzo HIRATA
Poster presentation, English, Annual Meeting on Photochemistry 2024
05 Sep. 2024
03 Sep. 2024- 05 Sep. 2024

Efficient red persistent room temperature phosphorescence from a selenium substituted aromatic carbon
Kikuya HAYASHI; Rajashekhar; MULIMANI KASHIPATI; Rana TSURU; Sakuya UEDA; Shuzo HIRATA
Oral presentation, English, Annual Meeting on Photochemistry 2024
05 Sep. 2024
03 Sep. 2024- 05 Sep. 2024

Synchronized Twosome in Benzoyl Linked N-Fused Ring for Highly Efficient Yellow Afterglow
Bahadur Sk; Shuzo Hirata
Oral presentation, English, Annual Meeting on Photochemistry 2024
05 Sep. 2024
03 Sep. 2024- 05 Sep. 2024

Role of multiple sulfur bridged substitutions for facilitating red persistent room-temperature phosphorescence
Rajashekhar Kashipati MULIMANI; Shuzo HIRATA
Poster presentation, English, Annual Meeting on Photochemistry 2024
03 Sep. 2024
03 Sep. 2024- 05 Sep. 2024

High-resolution oxygen sensing using persistent room-temperature phosphorescence from individual nanoparticles
Riku SHIMURA; Kikuya HAYASHI; Shuzo HIRATA
English, Annual Meeting on Photochemistry 2024
03 Sep. 2024
03 Sep. 2024- 05 Sep. 2024

Molecular Vibrations and Distortions Facilitating Persistent Room-Temperature Phosphorescence
Shuzo Hirata
Oral presentation, English, 29th PhotoIUPAC, Peer-reviewed
16 Jul. 2024
14 Jul. 2024- 19 Jul. 2024

High-Resolution Afterglow Modulation Using Efficient Persistent Room-Temperature Phosphorescence Materials
Shuzo Hirata
Invited oral presentation, English, OPTICS & PHOTONICS International Congress 2024, Invited
26 Apr. 2024
22 Apr. 2024- 26 Apr. 2024

Photoinduced Triplet Depletion Allowing Higher-Resolution Afterglow
Kikuya Hayashi; Shuzo Hirata
Oral presentation, English, SPIE Photonics Europe 2024, Peer-reviewed
09 Apr. 2024
07 Apr. 2024- 11 Apr. 2024

Challenge to improve the brightness of persistent room temperature phosphorescence for high-resolution autofluorescence-free imaging
Shuzo Hirata
Invited oral presentation, English, SPIE Photonics Europe 2024, Invited
09 Apr. 2024
07 Apr. 2024- 11 Apr. 2024

Photoinduced Triplet Depletion Allowing Higher-Resolution Afterglow
Kikuya Hayashi; Shuzo Hirata
Oral presentation, English, SPIE Photonics West 2024, Peer-reviewed
30 Jan. 2024

High-resolution afterglow imaging using efficient long-lived room-temperature phosphorescence
Shuzo Hirata
Invited oral presentation, English, SPIE Photonics West 2024, Invited, Peer-reviewed
30 Jan. 2024

協働刺激による高スピードアフターグロー光パターニングと 高解像アフターグロー読み出し
平田 修造; 林 希久也
Invited oral presentation, Japanese, 第72回高分子討論会, Invited
26 Sep. 2023

High-resolution afterglow patterning using cooperative vapo- and photo-chemical reactions
Kikuya Hayashi; Shuzo Hirata
Oral presentation, English, 2023年光化学討論会, Peer-reviewed
06 Sep. 2023

高輝度アフターグロー発光に向けた高濃度三重項蓄積挙動
平田 修造; Badriyah Ende Hopsah; 林 希久也; Sk Bahadur
Oral presentation, Japanese, 2023年光化学討論会, Peer-reviewed
05 Sep. 2023

Role of molecular vibrations and distortions facilitating persistent room-temperature phosphorescence
Shuzo Hirata
Invited oral presentation, English, CEMS Topical Meeting on Chemistry of pi-Conjugated Materials, Invited
31 Jul. 2023

Symmetry-breaking triplet excited state allowing enhanced red afterglow room-temperature phosphorescence
Bahadur Sk; Shuzo Hirata
Oral presentation, English, The 31st International Conference on Photochemistry (ICP2023), Peer-reviewed
25 Jul. 2023

Triplet Quenching Mechanism of Chromophores in Insulating Polymers
Takuya Kamatsuki; Shuzo Hirata
Oral presentation, Japanese, The 103rd CSJ Annual Meeting
22 Mar. 2023
22 Mar. 2023- 25 Mar. 2023

Photo-Induced Triplet Depletion Allowing Higher-Resolution Afterglow
Kikuya Hiyashi; Keiki Fukumoto; Shuzo Hirata
Oral presentation, English, 日本化学会第103回春季年会
22 Mar. 2023
22 Mar. 2023- 25 Mar. 2023

Excited state science of N-fused ring allowing selective and efficient triplet-singlet resonance energy transfer for bright red afterglow emission
Bahadur Sk; Shuzo Hirata
Oral presentation, English, Annual Meeting on Photochemistry 2022
13 Sep. 2022

計算科学を活用した戦略的長波長長寿命室温りん光材料の開発
平田修造
Invited oral presentation, Japanese, 第71回高分子討論会, Invited, Domestic conference
05 Sep. 2022

分子固体ホストの相状態の違いを利用した分子間熱活性三重項消光因子の考察
草間 智也; 平田 修造
Oral presentation, Japanese, 日本化学会 第102春季年会, Domestic conference
25 Mar. 2022

Key factor facilitating triplet-singlet resonance energy transfer for efficient red afterglow emission
Kikuya Hayashi; Kei Fukasawa; Takashi Yamashita; Shuzo Hirata
Oral presentation, English, Web Annual Meeting on Photochemistry 2021, Domestic conference
14 Sep. 2021

蓄光ナノイメージングを可能にする高輝度残光型室温りん光分子の開発
平田修造
Invited oral presentation, Japanese, 第69回高分子討論会, Domestic conference
16 Sep. 2020

実験と理論の協働によるπ共役系凝集体における三重項失活メカニズムの考察
平田修造
Invited oral presentation, Japanese, 第69回高分子討論会, Invited, Domestic conference
16 Sep. 2020

ドナーアクセプター直交型キラル分子を利用した高効率熱活性化遅延蛍光発生要因の考察
林希久也; 松本有正; 平田修造
Oral presentation, Japanese, 2020年web光化学討論会, Domestic conference
11 Sep. 2020

Highly Efficient Persistent Room Temperature Phosphorescence From Heavy Atom Free Molecules Triggered By Hidden Long Phosphorescent Antenna
Indranil Bhattacharjee; Shuzo Hirata
Oral presentation, English, Web Annual Meeting on Photochemistry 2020, Domestic conference
11 Sep. 2020

The effect of the lowest singlet excited state lifetime on up-conversion emission via stepwise two-photon absorption
Kentaro Yomogita; Shuzo Hirata
Poster presentation, English, Web Annual Meeting on Photochemistry 2020, Domestic conference
09 Sep. 2020

高次励起状態の電子構造制御による高輝度且つ高効率な長寿命室温りん光の抽出
平田修造
Invited oral presentation, Japanese, 第三回“光”機到来！Qコロキウム
06 Jul. 2020

Intrinsic analysis of transition processes from the lowest excited triplet state of heavy atom-free molecules with persistent room-temperature phosphorescence
Shuzo Hirata
Invited oral presentation, English, SPIE Photonics Europe, Digital Forum, Invited, International conference
29 Mar. 2020

置換基誘起の対称禁制遷移分子を用いた弱連続青色光下での大きな光制限効果
釜付卓弥; Bhattacharjee Indranil; 平田修造
Oral presentation, Japanese, Domestic conference
19 Mar. 2020

Intrinsic analysis of transition processes from the lowest excited triplet state of heavy atom-free conjugated molecular crystals with persistent room temperature phosphorescence
Shuzo Hirata
Invited oral presentation, English, 2019 MRS Fall Meeting, Boston, USA, Invited, Boston, USA, International conference
03 Dec. 2019

Donor-acceptor molecules showing photon upconversion emission by stepwise two photon absorption
YOMOGITA Kentaro; ZHANG Junxiang; MIZUTANI Ryota; VAHCA Martin; KAMADA Kenji; MARDER Seth; HIRATA Shuzo
Oral presentation, English, Annual Meeting on Photochemistry 2019, Domestic conference
04 Sep. 2019

分散系および凝集系における重原子フリー分子の三重項励起状態
平田修造
Invited oral presentation, Japanese, 141 M&BE 新分野開拓研究会「有機半導体制御技術の最新動向～分子配向・電荷・励起子～」, Domestic conference
28 Aug. 2019

Analysis of Triplet State in Conjugated Molecular Crystals toward Persistent Room Temperature Phosphorescence from Soft Crystals
Shuzo Hirata
Invited oral presentation, English, The 2nd International Symposium of Soft Crystals, Chiba, Japan, Invited, International conference
13 Jul. 2019

Exciton management for unique molecular emission characteristics
Shuzo Hirata
Invited oral presentation, English, The 36th International Conference of Photopolymer Science and Technology (ICPST-36), Chiba, Japan, Invited, International conference
25 Jun. 2019

Molecular Materials with Ultralong-Lived Room Temperature Triplet Excitons
Shuzo Hirata
Invited oral presentation, English, 2019 International Seminar on Polymer Photochemistry (2019 ISPP), Guangzhou, China, Invited, International conference
09 May 2019

高効率分子蓄光に向けた三重項からの輻射と非輻射過程の解析
平田
Oral presentation, Japanese, 日本化学会第99回春季年会 特別企画 ルミネッセンス化学アンサンブル：発光の未来を探る, Domestic conference
Mar. 2019

遷移双極子が小さい光学活性分子材料：円偏光遅延蛍光と円偏光室温蓄光
平田修造
Invited oral presentation, Japanese, 千葉大学分子キラリティーセンター定例研究会, Invited, Domestic conference
Jan. 2019

分散系共役分子および凝集系共役分子結晶の室温長寿命三重項励起子のサイエンスと機能
平田修造
Invited oral presentation, Japanese, PHyM若手フォーラム, Invited, Domestic conference
Nov. 2018

Intrinsic analysis of radiative process, intramolecular vibrational room-temperature nonradiative process, and quenching process from triplet state for heavy atom-free conjugated structures
Shuzo Hirata
Invited oral presentation, English, Annual Meeting on Photochemistry on 2018, Invited, Domestic conference
07 Sep. 2018

Intrinsic Analysis between Radiative Process and Room-Temperature Nonradiative Process based on Intramolecular Vibrations from Triplet State of Heavy Atom-free Aromatics toward Efficient Persistent Room-temperature Phosphorescence
Shuzo Hirata
Invited oral presentation, English, 2018 International Seminar on Advanced Materials Research 2018 ISAMR, Shanghai, China, Invited, International conference
Aug. 2018

Molecular Materials with Ultralong-lived Room-temperature Triplet Excitons
Shuzo Hirata
Invited oral presentation, English, Seminor in Key Laboratory of Advanced Display and System Applications (Shanghai University)
Aug. 2018

振動状態を考慮に入れたスピン禁制から見えてくる共役分子の三重項からの輻射・非輻射過程の本質
平田修造
Invited oral presentation, Japanese, 学振142委員会ABC合同部会, Invited, Domestic conference
Jul. 2018

分子発光材料の設計指針と現状
平田修造
Public discourse, Japanese, 新学術領域高次複合光応答分子システムの開拓と学理の構築, Domestic conference
Jan. 2018

Photofunctional materials using long-lived room-temperature triplet excitons
Shuzo Hirata
Invited oral presentation, English, Royal Society of Chemistry Symposia on Electronic and Photonic Materials, Tsukuba, Japan, Invited, International conference
Nov. 2017

Extraction of Unique Emission and Absorption Characteristics by Stabilization of Triplet Excitons
Shuzo Hirata
Invited oral presentation, English, The 97th CSJ Annual Meeting, Asian International Symposium- Photochemistry, Invited, Domestic conference
Mar. 2017

励起三重項を経由したルミネッセンスの科学と応用
平田修造
Invited oral presentation, Japanese, シンポジウム超短パルスレーザーと機能性材料, Invited, Domestic conference
Oct. 2016

White afterglow room temperature emission from isolated aromatic unit in air
Shuzo Hirata
Invited oral presentation, English, 2016 International Symposium on Integrated Molecular / Materials Science & Engineering (IMSE 2016), Qingdao, China, International conference
Oct. 2016

非共役系有機媒体の超剛直性を利用した芳香族分子の新規光機能
平田修造
Invited oral presentation, Japanese, 平成28年度繊維学会秋季研究発表会, Domestic conference
Sep. 2016

Large reverse saturable absorption under weak continuous incoherent light
Shuzo Hirata
Oral presentation, English, MRS Spring Meeting, Arizona, USA, International conference
Mar. 2016

スーパーハードな環境下での芳香族化合物からの新規光機能の開拓
平田修造
Invited oral presentation, Japanese, 第96回日本化学会春季年会, Invited, Domestic conference
Mar. 2016

Large reverse saturable absorption under weak continuous incoherent light
Shuzo Hirata
Invited oral presentation, English, The 32nd International Conference of Photopolymer Science and Technology, Chiba, Japan, Invited, International conference
Jun. 2015

室温長寿命励起子を用いた光機能性材料の開発
平田修造
Invited oral presentation, Japanese, 第95回日本化学会春季年会, Invited, Domestic conference
Mar. 2015

室温長寿命励起子を利用した非コヒーレント光に応答する非線形吸収材料の開発
平田修造
Invited oral presentation, Japanese, 高分子同友会, Invited, Domestic conference
Feb. 2015

Novel organic emitting materials for electronics and optics applications
Shuzo Hirata
Invited oral presentation, English, PITTCON CONFERENCE & EXPO 2012, JAPAN SYMPOSIUM, The State-of-the-Art Technologies, Florida, USA, Invited, International conference
Mar. 2012

Improvement of electroluminescence performance of organic light emitting diodes with a liquid emitting layer
Shuzo Hirata; Chihaya Adachi
Invited oral presentation, English, 2nd Asian Conference on Organic Electronics (A-COE 2010), Seoul, Korea, Invited, International conference
Dec. 2010

物理化学II
The University of Electro-Communications

物理化学II
電気通信大学

基礎物理化学
The University of Electro-Communications

基礎物理化学
電気通信大学

現代有機化学論
京都大学大学院

現代有機化学論
京都大学大学院

サステーナビリティー化学
東京工科大学

サステーナビリティー化学
東京工科大学

現代化学
The University of Electro-Communications

化学生命工学実験第一
The University of Electro-Communications

化学生命工学実験第一
The University of Electro-Communications

化学生命工学実験第一
電気通信大学

固体物性化学特論
The University of Electro-Communications

固体物性化学特論
電気通信大学

現代化学
The University of Electro-Communications

現代化学
電気通信大学

Sep. 2025 - Present
基礎有機化学会

日本化学会

応用物理学会

光化学協会

高分子学会

アメリカ化学会

The Pursuit of Functionality Woven by pi-Molecular Complexity
山口 茂弘; 成田 明光; 八木 亜樹子; 岩本 武明; 笹森 貴裕; 清水 章弘; 石垣 侑祐; 平田 修造; 若宮 淳志; 吉尾 正史; 中西 尚志; 松田 亮太郎; 柳井 毅
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nagoya University, Grant-in-Aid for Transformative Research Areas (A), 25H01253
Apr. 2025 - Mar. 2030

高度π分子体の３重項エンジニアリング
平田修造、福本恵紀
学術変革領域研究(A)計画班, Principal investigator, 25H01253
Apr. 2025 - Mar. 2030

生体内の高解像蓄光イメージング技術の創生(フェーズ2)
平田修造
JST, 創発的研究支援事業, 電気通信大学, Principal investigator
Apr. 2024 - Mar. 2028

りん光増強分子フレキシブル要素の抽出と赤色長寿命室温りん光への応用
Shuzo Hirata
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(B), Principal investigator, 24K01567
Apr. 2024 - Mar. 2027

分子固体の室温での三重項失活速度の推定法の確立
平田 修造
日本学術振興会, 科学研究費助成事業, 電気通信大学, 基盤研究(B), 本研究では、分子固体の室温での三重項失活速度の推定法の確立を目的としている。三重項失活速度の推定法を正しく推定するためには、材料の三重項からの輻射速度(kp)、三重項からの非放射遷移速度（knr）、および三重項からの分子間電子移動を経由した失活速度（kq）の3つを少なくとも定量的に議論し、推定可能な計算法を見出すことが必要となる。 本年度までに、knrに関しては20のさまざまな種類の有機分子や錯体に関して、室温エネルギーでの全振動による分子配座変化を考慮したスピン軌道相互作用を計算することで、実験値との良好な相関が取れることを確認している。この手法を用いると、さまざまな分子のknrが推定可能となることを学術論文で報告した。 kpの推定に関しては、これまで計算量コストの問題から、室温の熱による振動や室温の熱によって統計的に生まれる配座変化が考慮された計算は行われてこなかった。本年度は、その計算法に切り込み、室温の熱による振動や室温の熱によって統計的に生まれる配座変化によりknrが増強されずにkpのみが増強される分子群が存在することを明らかにした。knrが増強されずにkpのみが増強される分子群のサイエンスとして、ヘテロアトムの共役系の面外振動が誘起する系を学術論文で報告し、分子の対象性が崩れる系は学術論文の投稿準備中である。これら論文の中で、全振動考慮型のkp計算法とキーとなる振動のみを変動させるkp計算法を提案した。 またkq に関しては、さまざまなゲスト分子を絶縁ホスト分子に分散した材料を評価する中で、ホスト分子の動きとゲスト分子のT1とS0間のスピン軌道相互作用の両者がかかわる失活モードが存在することを統計的に明らかにし、学会で発表している。, 21H02011
Apr. 2021 - Mar. 2024

生体内の高解像蓄光イメージング技術の創生(フェーズ1)
平田修造
JST, 創発的研究支援事業
Apr. 2021 - Mar. 2024

Photoinduced Triplet Depletion for Super-Resolution Afterglow Imaging
Hirata Shuzo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Challenging Research (Exploratory), Afterglow emission allows imaging independent of autofluorescence under ambient conditions. Although higher resolution afterglow is crucial for increasing quality of the autofluorescence-free emission imaging, increase of excitation intensity to allow brighter afterglow emission induces a decrease of the resolution of afterglow images. Therefore, procedure and mechanism of materials to allow afterglow imaging with more higher-resolution capability is neccesary. Here, we report photoinduced triplet depletion and improved resolution of bright afterglow emission using depletion. Triplet excitons accumulated in a solid material by excitation were depleted under irradiation with a depletion beam with a longer wavelength than the absorption wavelength of the material. A higher-resolution afterglow image was observed by simultaneously focusing a donut-shaped depletion beam and an excitation beam., 21K18928
Jul. 2021 - Mar. 2023

残光機能や散乱機能を可逆的に制御可能なソフトクリスタルの構築
平田修造
日本学術振興会, 科学研究費助成事業, 電気通信大学, 新学術領域研究(研究領域提案型), 1秒に迫るもしくは超えるような長い発光寿命を有する室温りん光（長寿命室温りん光）は2015年から数多くの芳香族結晶からも報告されてきている。しかし分子結晶から室温蓄光を得るためには結晶内の強い分子間相互作用を用いることによる剛直性の追求が一般的であった。申請者は、長寿命室温りん光における三重項励起子の失活抑制には分子結晶の剛直性ではなく、三重項励起子拡散が抑制されるような三重項閉じ込め効果が鍵であると予想した。そして高解像顕微鏡を用いた三重項励起子拡散長の計測と量子化学計算による三重項励起子拡散能の推定を協働的に行うことで、三重項励起子拡散が抑制される結晶系では、分子間力が小さいような大幅に捻じれた共役分子系においても長寿命室温りん光が生じることを報告してきた。このことから、分子間力が小さいような系でも三重項閉じ込め効果が作用すれば長寿命室温りん光の発現が期待される。本研究では、長寿命室温りん光を示すソフトクリスタルの機能および長寿命室温りん光発現のメカニズムの明確化を研究の目的とする。 H8-binaphthyl骨格を有する分子固体系は、結晶と非晶を熱履歴で変化させることが可能であり、それに応じて長寿命室温りん光のスイッチングが可能である。これまで結晶時の長寿命室温りん光のメカニズムは不明であったが、合成の過程でH8に変換されないbinaphthylがわずかに存在し、それらの低いT1エネルギー状態が閉じ込められることで発現していることが予想された。実際に令和2年度開発した三重項無輻射遷移の計算法でT1が低いbinaphthylの三重項振動失活は十分に小さいことが裏付けられた。また三重項閉じ込めの論理に基づき、T1が低いゲストが力学的もしくは結晶内からの溶媒のリリースによって結晶内に取り込まれることで長寿命室温りん光を放射するような材料系を見出すことに成功した。, 20H04664
Apr. 2020 - Mar. 2022

先進的な発光特性を示す材料に関する研究
01 Apr. 2018 - 31 Mar. 2021

高次励起状態から発光する分子設計と光エネルギー材料への応用
平田修造
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Scientific Research (B), Electronic structures relating to the high order singlet excited state (Sn) have not been considered to control excitons. Here we enhance photon up-conversion characteristics via two-photon absorption and persistent room-temperature phosphorescence (RTP) characteristics by controlling the electronic structures relating to Sn. The effective separation between electronic structures relating to Sn and that relating to the lowest singlet excited state led to more fluorescence from Sn to allow enhanced photon-up conversion intensity after stepwise two-photon absorption. The enhancement of the transition dipole moment between Sn and the ground state by controlling the Sn electronic structure increases the rate constant of phosphorescence without largely increasing the rate constant of nonradiative transition from the lowest triplet excited state, resulting in a large increase of RTP yield with keeping long RTP lifetime., 18H02046
Apr. 2018 - Mar. 2021

化合物半導体ナノ粒子の光物性評価
平田修造
01 Oct. 2018 - 30 Sep. 2020

ソフトキラル分子結晶による刺激応答性室温円偏光蓄光材料の創生
平田 修造
日本学術振興会, 科学研究費助成事業, 電気通信大学, 新学術領域研究(研究領域提案型), 1秒以上の長い寿命を有する室温りん光（蓄光）は2015年からいくつかの芳香族結晶からも報告されてきているが、分子結晶から室温蓄光を得るためには結晶内の強い分子間相互作用を用いることによる剛直性の追求が一般的であった。最近申請者は、芳香族部位に敢えてより柔軟なシクロ環であるH8部位を導入したH8-binaphytyl骨格のキラル芳香族分子の結晶を用いると効率よい室温蓄光が得られることを見出した。キラル分子結晶からの蓄光特性の発現は初めての現象であり、円偏光蓄光特性などの新規機能発現が期待される。さらに、柔軟なシクロ環であるH8部位の導入により、このような結晶群では蓄光特性が低刺激の力学応答や低温で変化する可能性がある。本研究では、ソフトな非共役部位を有する新規キラル芳香族分子の結晶群を用いて、円偏光蓄光機能の構築と、外部刺激による円偏光蓄光の動的制御を目的とする。 三重項励起子拡散が大きいことが数多くの重原子フリーの分子結晶から長い寿命の室温りん光が生じない理由であることを高解像顕微鏡と計算科学を協働させることで明確にした。さらに高効率室温りん光を示す重原子フリードーパントを、同等の最低励起三重項(T1)エネルギーを示すフルオレン結晶とH8-BINAP結晶にそれぞれドープしたところ、フルオレン結晶中では室温りん光を示さなかったが、H8-BINAP結晶中ではドーパント由来の強い長寿命の室温りん光が観測された。この原因がフルオレン結晶が三重項励起子拡散能が大きい一方で、H8-BINAP結晶中では三重項励起子拡散が生じにくいことに由来することを計算科学的アプローチにより確認した。 計算科学により三重項励起子拡散能が可逆的に変化する結晶を探索し、異なる蒸気下で結晶構造が変化することで三重項状態の電子構造と励起子拡散能が変化し、微弱に長寿命の室温りん光応答が可逆的に変化する結晶を見出した。, 18H04507
Apr. 2018 - Mar. 2020

従来の分子光励起応答の制約を打破する革新的な分子励起サイエンスに関する研究
文部科学省卓越研究員事業
01 Jan. 2018 - 31 Mar. 2019

高発光量子収率と高2色性を示す円偏光発光型熱活性化遅延蛍光材料の開発と高性能表示素子への応用
平田修造
JST, 地域産学バリュープログラム
01 Sep. 2017 - 31 Mar. 2019

先進的有機機能性材料に関する研究
平田修造
文部科学省, 平成２９年度科学技術人材育成費補助事業「卓越研究員事業」助成金, Principal investigator
Jan. 2018 - Mar. 2019

Science of zero oscillator strength for circularly polarized luminescence and their application for light emitting diodes
Hirata Shuzo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, The University of Electro-Communications, Grant-in-Aid for Challenging Research (Exploratory), Novel chiral conjugated molecules with significant small oscillator strength for fluorescence (F) were synthesized. The chiral molecules that a chiral carbon is located between the highest occupied molecular orbital and the lowest unoccupied molecular orbital showed circularly polarized luminescence with absolute value of dissymmetry factor (|g|) of 10-3 when they were doped in solutions or solid films. On the other hand, |g| of the molecules largely increased up to 5×10-2 in their crystalline thin films. Emission yield (ΦPL) of the molecules did not decrease between doped condition and aggregated crystalline state because of no large Davydov splitting due to the significant small F value. One of the chiral molecules showed large ΦPL as well as large |g| in crystalline state., 17K19152
Jun. 2017 - Mar. 2019

Molecular-level study and control of cooperative photoresponse of molecular complexes
VACHA Martin
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Technology, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Using single-molecule spectroscopy we studied and controlled the photoresponse of molecular complexes, such as aggregates, molecular crystals and conjugated polymers, as well as their semiconducting counterparts, such as quantum dots, and hybrid systems composed of noble metal nanoparticles and organic dyes. The results include conformational and spectroscopic characterization of poly(phenylene vinylene) and polyfluorene conjugated polymers, origin and suppression of defect emission and characterization of band-edge emission in I-III-IV semiconductor quantum dots, characterization of blinking, emission quantum efficiency and electroluminescence in halide perovskite nanocrystals, effect of enhancement of resonant energy transfer between organic dyes by localized plasmons and study of triplet exciton diffusion, phosphorescence and of triple-triplet annihilation and photon upconversion in molecular solids., 26107014
Jul. 2014 - Mar. 2019

先進的有機機能性材料に関する研究
平田修造
研究助成, Principal investigator
Jun. 2017 - Dec. 2017

非晶材料中における分子運動性と三重項励起子の寿命の関係に関する研究
平田修造
京都大学化学研究所, 共同設備利用費, Principal investigator
Apr. 2016 - Mar. 2017

Highly efficient circularly polarized organic luminogens with a large dissymmetry factor of circularly polarized luminescence characteristics
Hirata Shuzo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Technology, Grant-in-Aid for Challenging Exploratory Research, Three kinds of metal-free aromatic compounds (CPDF1-3) with a chiral carbon sandwiched between a donor moiety and an acceptor moiety were designed. They showed thermally activated delayed fluorescence (TADF) as well as circularly polarized luminescence (CPL) characteristics. (R)-CPDF3 and (S)-CPDF3 showed CPL with a dissymmetry factor of 4×10-4 in toluene solution. CPDF3 doped into π-conjugated host with large energy of the lowest triplet excited state displayed a photoluminescence quantum yield of 99%. An electroluminescence (EL) device having a 30 wt% CPDF3 doped π-conjugated host as an emitting layer showed an external EL quantum yield of 9.5%. With increasing the concentration of (R)-CPDF3 and (S)-CPDF3 in the emitting layer, intermolecular charge transfer transition largely contributed to TADF, causing a disappearance of CPL characteristics from the devices., 26620165
Apr. 2014 - Mar. 2017

Large reverse saturable absorption at sunlight power level using ultralong lifetime of triplet excitons
Hirata Shuzo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Technology, Grant-in-Aid for Young Scientists (A), Large reverse saturable absorption (RSA) at sunlight power level was observed from a host-guest amorphous material composed of d12-coronene as a guest and β-estradiol as a rigid amorphous host. Large highly symmetric two dimensional (2D) aromatic structure of d12-coronene doped into the rigid host causes ultralong triplet lifetime as well as high triplet yield, serving efficient accumulation of the triplet excitons of d12-coronene under weak excitation light. The high absorption coefficient of the triplet state (σ34) compared with that of the ground state (σ01) for d12-coronene is also caused by the highly symmetric 2D aromatic structure. The efficient accumulation of the triplet excitons and high σ34/σ01 led to an onset of the RSA characteristics under irradiance below 10-1 mW cm-2. An film of the amorphous material showed a large decrease of transmittance from 66% at 0.02 mW cm-2 to 24% at 50 mW cm-2 for continuous light at 405 nm., 26708010
Apr. 2014 - Mar. 2017

ナノ空間場を用いた10 mW/cm2で最大効率を示すフォトンアップコンバージョン材料への挑戦
平田修造
野口遵研究所, 研究助成, Principal investigator
Apr. 2015 - Mar. 2016

10 mW/cm2以下の非コヒーレント光照射で大きな非線形吸収を示す材料への挑戦
平田修造
住友財団, 研究助成, Principal investigator
Apr. 2014 - Sep. 2015

低パワーの非コヒーレント光による高効率エネルギーアップコンバージョン
平田修造
矢崎科学技術振興記念財団, 研究助成, Principal investigator
Apr. 2014 - Mar. 2015

明るい環境でより鮮やかに着色する有機材料の開発
平田修造
コスメトロジー研究振興財団, 研究助成, Principal investigator
Apr. 2014 - Mar. 2015

生体内の高コントラスト動的イメージングにむけた時間分解発光ラベルの開発
平田修造
一般財団法人バイオインダストリー協会, 研究助成, Principal investigator
Oct. 2013 - Sep. 2014

メタルフリーの低閾値非線形吸収材料の開発
平田修造
新化学技術推進協会, 研究助成, Principal investigator
May 2013 - Apr. 2014

低パワーの非コヒーレント光に応答する非線形吸収材料の開発
平田修造
東京工業大学, 新任助教助成, Principal investigator
Aug. 2013 - Mar. 2014

Stretching Organic Solar Cells using a Gel Composed of Conjugated Liquids and a Polymer Matrix
HIRATA shuzo
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tokyo Institute of Technology, Grant-in-Aid for Challenging Exploratory Research, We fabricated solar cells whose active layer is constructed from a gel material composed of conjugated liquid molecules and a polymer matrix. Elastic modulus and strain of the gel materials were 0.01 times less than and 100 times larger than those of conventional solid conjugated polymers, respectively. Power conversion efficiency of the solar cells containing the gel layer as an active layer was 0.01% when they were not stretched. The power conversion efficiency of a solar cell using conventional conjugated polymer as an active layer decreases when the device was stretched to 20%. On the other hand, the decrease of power efficiency was not observed in the devices using the gels as an active layer., 24655175
Apr. 2012 - Mar. 2014

低パワー非コヒーレント光による有機非線形吸収の実現と調光材料への応用
平田修造
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Kyushu University, Grant-in-Aid for Young Scientists (B), Principal investigator, We developed an organic RSA material that displays a large decrease in transmittance upon exposure to weak incoherent light, such as that from light emitting diodes(LEDs), at room temperature(RT) in air. To minimize threshold of transmittance decrease(Fth) and obtain a large decrease in transmittance, two kinds of guest compounds dispersed in an amorphous steroidal host matrix were used. One guest compound is a metal complex used as a donor for photosensitization and the other is a deuterated aromatic deuterated carbon that behaves as an acceptor to allow efficient accumulation of the Ti state. The accumulation of long-lived RT triplet excitons of the acceptor with a large triplet-triplet absorption coefficient by photosensitization of the donor allowed a drastic decrease in the power threshold to be realized., 22750132
Apr. 2010 - Mar. 2012

2022年光化学討論会 男女共同参画・若手研究者交流ランチョンシンポジウム
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