| Project/Area Number |
23KF0263
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 外国 |
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| Review Section |
Basic Section 35030:Organic functional materials-related
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| Research Institution | Kyushu University |
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Principal Investigator |
安達 千波矢 九州大学, 工学研究院, 教授 (30283245)
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| Co-Investigator(Kenkyū-buntansha) |
KIM HYUNG SUK 九州大学, 工学研究院, 外国人特別研究員
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| Project Period (FY) |
2023-11-15 – 2026-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2025: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2024: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2023: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | TADF / Spin-flip process / IPN-derivative / Charge-transfer / OLED / RISC / COMPASS / Spin-orbit coupling |
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| Outline of Research at the Start |
We will propose a comprehensive TADF model that incorporates a four-level electronic structure to fully account for the observed experimental responses in our study. This model will take into consideration the spin-flip process facilitated by an intermediate, high-lying T state. It will be constructed based on the principles of universal exciton dynamics using time-dependent population rate equations. This approach will provide us with a better understanding of the underlying spin-flip mechanisms.
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| Outline of Annual Research Achievements |
We have developed a comprehensive analytical spin-flips (COMPASS) TADF model that incorporates a four-level electronic structure to fully account for the observed experimental responses in our study. This model accounts for the spin-flip process facilitated by an intermediate, high-lying T state. It is constructed based on the exciton dynamics using time-dependent population rate equations. This approach enhances our understanding of complex spin-flip mechanisms. We successfully published our research in Nature Communications on March 13th. The title of the paper is "Understanding complex spin up-conversion processes in charge-transfer-type organic molecules". (refer to Kim et al., Nat. Commun., 15, 2024, 2267)
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Thanks to the support of the JSPS post-doc fellowship, we were able to achieve research outcomes faster than anticipated. The initial experimental results were consistently reproduced, and based on these, our described exciton dynamics model could very effectively explain the experimental findings. This minimized the time spent on trial and error, and as a result, one of our most crucial research projects planned until December 2024 has been published in Nature Communications. Additionally, we presented oral and poster presentations at two international conferences (IMID, KJF-ICOMEP) related to this research. Building on these achievements, we aim to deepen our understanding of charge-transfer molecules to contribute to the creation of highly efficient advanced molecules.
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| Strategy for Future Research Activity |
Through our study, we have laid the groundwork for describing complex spin-flip processes in charge-transfer (CT) type organic materials. However, there is an increasing need to expand our understanding to encompass a broader range of CT systems. Given the complexity of the exciton model, we must clarify the ambiguity surrounding a series of rate constants in these systems. Therefore, while utilizing the 4CzIPN molecule as a prototype in this study, we intend to introduce the heavy atom effect to the outer electron donor carbazole structure. We will then examine the temperature-dependent spin-flip behavior in 4CzIPN molecules to gain a deeper understanding of their behavior.
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