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Three-State-Involving Vibronic Resonance Is a Key to Enhancing Reverse Intersystem Crossing Dynamics of Organoboron-Based Ultrapure Blue Emitters

preprint
submitted on 03.06.2020 and posted on 04.06.2020 by Inkoo Kim, Kwuang Hyun Cho, Soon Ok Jeon, Won-Joon Son, Dongwook Kim, Young Min Rhee, Inkook Jang, Hyeonho Choi, Dae Sin Kim
In organoboron OLED emitter DABNA, vibronic resonance strongly enhances reverse intersystem crossing rate even with a sizable T1-S1 energy gap. The resonance is peculiar in that the vibrational frequency has to match both (1) the T1-S1 energy gap and (2) the T1-T3 nonadiabatic coupling oscillation frequency. This three-state involving resonance is a result of combination of T1-T3-S1 superexchange and T1-T3 non-Condon coupling.

History

Email Address of Submitting Author

ymrhee@kaist.ac.kr

Institution

Korea Advanced Institute of Science and Technology

Country

Korea (ROK)

ORCID For Submitting Author

0000-0002-2392-3962

Declaration of Conflict of Interest

None

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