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共役系高分子ポリフルオレンの一本鎖における力学特性と蛍光を同時計測 高分子鎖内の集合体による光力学的な引力
2023/05/19
掲載言語： 日本語
要点-一本の共役系高分子鎖の蛍光と力学特性の同時計測に成功。-ポリフルオレンの緑色発光のメカニズムを解明。-集合体による光力学的な引力を発見。概要東京工業大学物質理工学院材料系のVACHAMartin（バッハマーティン）教授の研究チーム
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Unraveling the Mechanism of Green Emission Peaks in Single Polyfluorene Chains
2023/05/19
掲載言語： 英語
Using a pioneering experimental approach of mechanical manipulation under fluorescence, researchers from Tokyo Tech unveil the elusive origin of the observed green emission band in single polyflu
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ペロブスカイトナノ粒子LEDはなぜ低効率か ブリンキングによる消光時間の増加が原因と究明
2019/10/16
掲載言語： 日本語
要点-超解像顕微鏡により発光ダイオード中のペロブスカイト粒子の発光を解析-ナノ凝集体中の一部のナノ粒子のみで電界発光が生じていることを確認-上記一部のナノ粒子の電界発光の点滅度合いの増加が低い電光変換の原因概要東京工業大学物質理工学院材料系
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2019/10/09
掲載言語： 英語
Researchers from Tokyo Institute of Technology (Tokyo Tech) used the method of single-particle spectroscopy to study electroluminescence in light-emitting devices. They discovered that efficient c
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2014/10/03
掲載言語： 日本語
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Electroluminescence from a single polymer chain
2014/09/10
掲載言語： 英語
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高分子1本鎖からの電界発光を観測 ―高分子ELディスプレイや照明の高耐久性に寄与―
2014/08/29
掲載言語： 日本語
学位
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理学博士
研究キーワード
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Single molecule spectroscopy
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単一分子分光
研究分野
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ナノテク・材料 / 有機機能材料
学歴
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Charles University, Prague, Faculty of Mathematics and Physics, Department of Chemical Physics
- 1991年
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Charles University, Prague, Faculty of Mathematics and Physics, Department of Chemical Physics
- 1991年
所属学協会
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The Society of Polymer Science
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高分子学会
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American Chemical Society
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American Chemical Society
委員歴
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Nature Publishing Group NPG Asia Materials Editorial Board
2012年1月 - 現在
団体区分：その他
論文
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Efficient Hot Carrier Management in Lead Halide Perovskite Micro‐Disks Revealed by Super‐Diffusive Migration 査読
Nithin Pathoor, Shun Omagari, Martin Vacha
Advanced Science 2026年7月
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Long-Range Exciton Transport in Anthracene-Based Supramolecular Mesostructures and Its Control by Surface Plasmons 査読
Nithin Pathoor, Qiwen Tan, Wenhao Zhang, Misa Nozaki, Takatoshi Fujita, Toranosuke Takagi, Shun Omagari, Yoshimitsu Sagara, Martin Vacha
Nano Letters 2026年7月
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Photoluminescence Emitter with 100% Power Efficiency─The Key Role of the Absorption Edge in CsPbBr3 Perovskite Quantum Dots
Jan Valenta, Michael Greben, Toranosuke Takagi, Martin Vacha
ACS Nano 2026年5月
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Unveiling the nanoscale dynamics of electroluminescence
Martin Vacha
Nature Photonics 2026年5月
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Takumi Aizawa, Hironari Arima, Sota Mihara, Takahiro Ueno, Shotaroh Yoshii, Takuho Saito, Hiroki Itabashi, Sougata Datta, Hiroki Hanayama, Akira Sakamoto, Rintaro Shimada, Sarah E. Rogers, Martin J. Hollamby, Takashi Kajitani, Yoshiki Ishii, Go Watanabe, Koji Harano, Takuma Matsumoto, Nithin Pathoor, Martin Vacha, Hikaru Sotome, Shiki Yagai
Journal of the American Chemical Society 2026年4月
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Room temperature collective blinking and photon bunching from CsPbBr3 quantum dot superlattice
Qiwen Tan, Sudipta Seth, Boris Louis, Xiayan Wu, Nithin Pathoor, Toranosuke Takagi, Shun Omagari, Takumi Sannomiya, Johan Hofkens, Martin Vacha
Nature Communications 2026年3月
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Nanoparticle-Mediated Interface Engineering for Uniform, Reproducible Electron Transport Layers in Scalable Perovskite Solar Cells
Charlie Henderson, Adriano S. Marques, Izabela S. Bicalho, Lucy J. F. Hart, Amy Monahan, Katherine Stewart, Koki Asano, Tianhao Lan, Martin Vacha, Molly M. Stevens, Piers R. F. Barnes, Diego Bagnis, Ji-Seon Kim
ACS Applied Materials & Interfaces 2026年2月
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Controls and evidence for assigning europium emission in Eu-treated CsPbCl3 nanocrystals
Yanfei Wang, Martin Vacha, Shun Omagari
Physical Chemistry Chemical Physics 2026年
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Synthesis and single-particle photophysics of BaZrS3 chalcogenide perovskite quantum dots
Toranosuke Takagi, Yoshinori Kimoto, Nithin Pathoor, Shun Omagari, Tadashi Kawamoto, Takuya Kato, Hiroaki Nakamura, Issei Takenaka, Martin Vacha
Nanoscale 2026年
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Tomoaki Sakurada, Nithin Pathoor, Takuma Matsumoto, Rattapon Khamlue, Petcharaphorn Chatsiri, Jan Valenta, Tadashi Kawamoto, Shun Omagari, William A. Tisdale, Watcharaphol Paritmongkol, Yeongsu Cho, Martin Vacha
Journal of the American Chemical Society 2025年10月
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Chelation-Driven Dissolution and Single-Crystal Growth of Hybrid Metal Organochalcogenide Semiconductors by Polydentate Amines
Rattapon Khamlue, Petcharaphorn Chatsiri, Tomoaki Sakurada, Jesadaporn Chotimook, Pimpan Leangtanom, Pongkamon Prayongkul, Thassanant Atithep, Jintara Padchasri, Pinit Kidkhunthod, Martin Vacha, Pichaya Pattanasattayavong, Watcharaphol Paritmongkol
Journal of the American Chemical Society 2025年10月
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Luminescence Variability of CsPbBr3 Nanocrystals in Single-Particle Emitter Applications
Shun Omagari, Eisuke Hirao, Martin Vacha
ACS Applied Nano Materials 2025年8月
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Vortex-Flow-Directed Chiral Macroscopic Ordering of Platelet Nanostructures Formed via the Supramolecular Assembly of Platinum Complexes with Bis(phenylisoxazolyl)benzene
Masaya Yoshida, Kyota Yasuda, Takuma Matsumoto, Yudai Ono, Naoyuki Hisano, Mao Kawasaki, Takehiro Hirao, Ye Yuan, Shin-ichi Tate, Martin Vacha, Takeharu Haino
Journal of the American Chemical Society 2025年8月
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Anisotropic Cation Migration Drives the Formation and Stability of Lateral 3D/2D Perovskite Heterostructures
Xiayan Wu, Shun Omagari, Martin Vacha
ACS Energy Letters 2025年7月
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Unveiling the Local Fate of Charge Carriers in Halide Perovskite Thin Films via Correlation Clustering Imaging
Sudipta Seth, Boris Louis, Koki Asano, Toon Van Roy, Maarten B. J. Roeffaers, Elke Debroye, Ivan G. Scheblykin, Martin Vacha, Johan Hofkens
Chemical & Biomedical Imaging 2025年4月
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Real-Time Structural Dynamics at the 3D/2D Perovskite Interface in CsPbBr3/PEA2PbBr4 Nano-heterostructures
Xiayan Wu, Nithin Pathoor, Xin Xu, Shun Omagari, Toranosuke Takagi, Martin Vacha
Nano Letters 2025年1月
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Small Au Nanoparticles Synthesized by Peptide-Based Biomineralization for Catalytic Applications
Masayoshi Tanaka, Yuka Kiriki, Nozomi Kiyohara, Mirei Hayashi, Abiral Tamang, Tomonori Nakamura, Martin Vacha, Yonghyun Choi, Jonghoon Choi, Wataru Yoshida, Kevin Critchley, Stephen D. Evans, Mina Okochi
ACS Applied Nano Materials 2024年5月
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Qiwen Tan, Nao Koishihara, Shun Omagari, Takehiro Hirao, Takeharu Haino, Martin Vacha
The Journal of Physical Chemistry C 128 ( 10 ) 4295 - 4302 2024年3月
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Resolving Multi-Asperity Contacts at the Nanoscale through Super-Resolution Fluorescence Imaging
Begüm Demirkurt, Dina Petrova, Dharmendar Kumar Sharma, Martin Vacha, Bart Weber, Daniel Bonn, Albert M. Brouwer
The Journal of Physical Chemistry Letters 2024年2月
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Sho Takahashi, Takuma Matsumoto, Martin J. Hollamby, Hiroshi Miyasaka, Martin Vacha, Hikaru Sotome, Shiki Yagai
Journal of the American Chemical Society 2024年1月
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In Situ Monitoring of Nanocrystal Formation and Ion Migration in Lead Halide Perovskite Metal–Organic Framework Composites
Xiayan Wu, Shun Omagari, Jinwei Gao, Martin Vacha
Advanced Optical Materials 2024年1月
共同研究・競争的資金等の研究課題
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メゾ光計測
研究課題/領域番号：23H04875 2023年4月 - 2028年3月
日本学術振興会 科学研究費助成事業 学術変革領域研究(A)
VACHA Martin, 増尾 貞弘
配分額：160420000円 （ 直接経費：123400000円 、 間接経費：37020000円 ）
In the past year, research was carried out on exciton diffusion along individual nanorings formed from barbituric acid rosettes. Fluorescence anisotropy measurements together with numerical simulations showed that the exciton diffusion is limited to 2-4 nm along the ring, irrespective of its shape distortion. Further research was aimed at studying energy transport along supramolecular nanofibers self-assembled from tris(phenylisoxazolyl)benzene molecules and at the effect of surface plasmons on the transport. It was found that thick nanofibers function as waveguides for fluorescence which can transfer tens of micrometers. On substrates of gold nanohole arrays the surface plasmons cause strong leakage of the guided light, the spectrum of which is consistent with plasmon resonance wavelength. Apart from organic mesostructures, research was also carried out on nanocrystal formation and ion migration in lead halide perovskite metal-organic framework hierarchical composites where dynamic compositional heterogeneity due to local ionic environment was discovered. Further, with the goal of realizing long-distance exciton transfer between quantum dots (QDs) arranged using molecular assemblies as templates, the light-emitting behavior of the QDs at the single-QD level was evaluated. Also, using perylene bisimide as the templating molecule, QD array structure was successfully constructed and evaluated.
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単一ハライドペロブスカイトナノ結晶における電界発光及び光物理過程の研究
研究課題/領域番号：19H02684 2019年4月 - 2024年3月
日本学術振興会 科学研究費助成事業 基盤研究(B)
VACHA Martin
配分額：17940000円 （ 直接経費：13800000円 、 間接経費：4140000円 ）
The purpose of the project is to study the basic photophysical properties of single halide perovskite nanocrystals by photoluminescence and electroluminescence single-particle spectroscopy, with the perspective of development towards nanoscale light-emitting optoelectronic devices. The methodology is based on measurement and analysis of emission intensity time traces, spectra and excited state lifetimes. The key questions include origin and methods of suppression of blinking in both EL and PL, origin of spectral diffusion in relationship with structural/compositional stability, and effect of surface functionalization and nanocrystal orientation on the effectivity of charge transport and charge recombination.
In the past year, the research on the mechanism and methods of suppression of PL blinking included ligand engineering of the CsPbBr3 nanocrystals. The commonly used oleylamine ligands, which passivate the surface of the nanocrystals as a result of the synthesis process, were replaced by less bulky DDAB ligands. The ligand exchange had a profound effect on the PL blinking, causing a desired extension of the PL on-times (periods without the loss of PL intensity). Further, EL devices showing the potential of detecting EL signal from individual nanocrystals were fabricated and optimized with respect to charge injection and transport. In another direction of the research, a series of mixed cation (MA/FA) hybrid organo-metallic halide perovskite films were fabricated and the initial PL studies revealed the presence of PL blinking as well as nanoscale structural heterogeneity.