2021 Fiscal Year Annual Research Report
Controlling excited-state proton transfer dynamics using nanocavity engineering
| Project/Area Number |
19F19034
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| Research Institution | Kyushu University |
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Principal Investigator |
恩田 健 九州大学, 理学研究院, 教授 (60272712)
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| Co-Investigator(Kenkyū-buntansha) |
KONINTI RAJ KUMAR 九州大学, 理学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2019-10-11 – 2022-03-31
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| Keywords | encapsulation / microporous crystal / MCM-41 / benzophenone / OLED / TADF |
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| Outline of Annual Research Achievements |
Controlling excited-state characters of molecules is of great importance for developing novel photofunctional materials. Encapsulation of a molecule is one of the promising methods by coupling with rapid development of novel porous materials such as metal organic frameworks. Nevertheless, there is little information on excited characters in a small cavity due to experimental and theoretical difficulties. We developed the handling methods of molecules in a various nano- and micro-cavities and combined with our ultrafast spectroscopic techniques. As a result, we found that the emissive character of a prototypical emissive molecule, benzophenone, is dramatically changed when it is encapsuled in a nanocavity of mesoporous material, MCM-41. Aiming at applications of this novel phenomenon to luminescent devices, we also investigated encapsulation effects on emissive materials for organic light emitting diode (OLED), and found that the encapsulation highly improves their thermally activated fluorescence (TADF) activities. Recently, TADF activities have attracted much attention for applications not only to the emissive materials for OLED but also to the harvesting of long-lived triplet-states in various photofunctional materials. Thus, this new finding would be contributed to developments of novel highly efficient photofunctional devices. Moreover, we discovered that light irradiation accelerates encapsulation process for a certain type of emissive materials. This finding would open a new world such as light control of encapsulation and decapsulation of photofunctional molecules.
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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