| Budget Amount *help |
¥45,110,000 (Direct Cost: ¥34,700,000、Indirect Cost: ¥10,410,000)
Fiscal Year 2021: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2020: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥28,340,000 (Direct Cost: ¥21,800,000、Indirect Cost: ¥6,540,000)
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| Outline of Final Research Achievements |
The fast spin-flip realized in some thermally activated delayed fluorescence emitters is considered to be due to a higher-order triplet excited state (Tn). The aim of this project was to collect experimental evidences of Tn, in order to gain a deeper understanding of its role in the fast spin-flip process. As the main experimental techniques, transient photoluminescence (PL) and time-resolved PL spectrum measurements were utilized. In this project, we first developed the necessary analytic methods of the experimental results and then found experimental conditions where singlet-triplet and triplet-triplet annihilation processes is negligible. In addition, the influences of long-lived PL components due to charge recombination and dimers (or aggregates) in solid-state samples were clarified. Finally, we demonstrated that the energy level of Tn is determined and its characters were revealed by means of transient PL and time-resolved PL spectrum measurements.
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