| Project Area | Materials Science of Meso-Hierarchy |
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| Project/Area Number |
23H04875
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| Research Category |
Grant-in-Aid for Transformative Research Areas (A)
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| Allocation Type | Single-year Grants |
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| Review Section |
Transformative Research Areas, Section (II)
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| Research Institution | Institute of Science Tokyo |
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Principal Investigator |
VACHA Martin 東京工業大学, 物質理工学院, 教授 (50361746)
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| Co-Investigator(Kenkyū-buntansha) |
増尾 貞弘 関西学院大学, 生命環境学部, 教授 (80379073)
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| Project Period (FY) |
2023-04-01 – 2028-03-31
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| Project Status |
Granted (Fiscal Year 2024)
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| Budget Amount *help |
¥160,420,000 (Direct Cost: ¥123,400,000、Indirect Cost: ¥37,020,000)
Fiscal Year 2024: ¥28,990,000 (Direct Cost: ¥22,300,000、Indirect Cost: ¥6,690,000)
Fiscal Year 2023: ¥41,600,000 (Direct Cost: ¥32,000,000、Indirect Cost: ¥9,600,000)
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| Keywords | 単一分子分光 / Single-molecule studies / Exciton transport |
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| Outline of Research at the Start |
超分子構造は、励起子の長距離輸送など、構造に特有の性質を示すことから注目されている。この超分子構造をさらに階層的に集積した「メゾヒエラルキー構造」においては、全く新しい光機能や特性が期待される。本研究では、超微弱光を検出可能な単一分子分光と原子間力顕微鏡を組み合わせた高度な顕微分光技術を駆使することにより、超分子構造からメゾヒエラルキー構造までの様々なスケールでの新規機能を精査する。最終目標は、メゾヒエラルキー構造における一重項および三重項励起子の長距離輸送を決定するキーファクターを解明し、それを完全に制御することである。
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The research is progressing according to the plan.
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| Strategy for Future Research Activity |
This year, research will continue on exciton transport along thin supramolecular nanofibers of tris(phenylisoxazolyl)benzene molecules. Further, exciton transport will be explored on nanofibers self-assembled from the mechanochromic material based on luminescent the 9,10-bis(phenylethynyl)anthracene core, with the goal of mechanical manipulation of the transport. Apart from the organic mesostructures, nanoscale photoluminescence properties of 3D/2D interface of mesohierarchical structures formed from CsPbBr3/PEA2PbBr4 by post-growth assembly will be studied. Further, the correlation between the Bohr diameter and single photon generation behavior will be investigated. Also, regarding the 1D array structure of QDs, exciton diffusion will be evaluated and other QD types will be considered.
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