| 研究課題/領域番号 |
23KF0263
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 基金 |
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| 応募区分 | 外国 |
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| 審査区分 |
小区分35030:有機機能材料関連
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| 研究機関 | 九州大学 |
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研究代表者 |
安達 千波矢 九州大学, 工学研究院, 教授 (30283245)
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| 研究分担者 |
KIM HYUNG SUK 九州大学, 工学研究院, 外国人特別研究員
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| 研究期間 (年度) |
2023-11-15 – 2026-03-31
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| 研究課題ステータス |
交付 (2023年度)
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| 配分額 *注記 |
2,000千円 (直接経費: 2,000千円)
2025年度: 300千円 (直接経費: 300千円)
2024年度: 900千円 (直接経費: 900千円)
2023年度: 800千円 (直接経費: 800千円)
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| キーワード | TADF / Spin-flip process / IPN-derivative / Charge-transfer / OLED / RISC / COMPASS / Spin-orbit coupling |
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| 研究開始時の研究の概要 |
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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| 研究実績の概要 |
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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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
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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| 今後の研究の推進方策 |
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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