2023 Fiscal Year Annual Research Report
Meso-hierarchy optical characterization
| Project Area | Materials Science of Meso-Hierarchy |
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| Project/Area Number |
23H04875
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| Research Institution | Tokyo Institute of Technology |
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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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| Keywords | Single-molecule studies / Exciton transport |
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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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