2022 Fiscal Year Annual Research Report
Study and control of long-range exciton transport in organic and hybrid nanostructures for future exciton-based electronics
| Project/Area Number |
21K18927
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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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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Keywords | Exciton transport |
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| Outline of Annual Research Achievements |
The purpose of this research is to study long-range exciton transport in organic and hybrid systems with the aim to understand the key design principles for long-range exciton transport in mesoscopic structures, including the roles of topology and dimensionality, and to discover ways to actively control the key factors of the exciton transport efficiency.
In the past year, the research focused on the detailed characterization of exciton transport in molecular fibers and fiber bundles self-assembled from derivatives of the small molecule tris(phenylisoxazolyl)benzene. Combined atomic force and fluorescence confocal microscopy revealed that average exciton transport along the fibers occurs on the distance of 340 nm. This value is much larger than the expected exciton transport of tens of nanometers in organic molecular solids, and holds promise for further development and applications. Further characterization showed that the long-range exciton transport is not affected by the fiber bundle thickness or curvature, but that the fiber photophysical properties such as fluorescence spectra can be effectively controlled by surface plasmons of nanostructured gold substrates. On the other hand, study of exciton transport was also carried out on supramolecular nanorings self-assembled from derivatives of naphthalene barbiturate. Polarized excitation and emission microscopy on individual nanorings showed that the exciton transport is limited to distances of several nanometers.
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