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- W4367052004 abstract "The pursuit of ideal short-delayed thermally activated delayed fluorescence (TADF) emitters is hampered by the mutual exclusion of a small singlet-triplet energy gap (ΔEST) and a large oscillator strength (f). Here, by attaching an multiresonance-acceptor onto a sterically-uncrowded donor, we report TADF emitters bearing hybrid electronic excitations with a main donor-to-acceptor long-range (LR) and an auxiliary bridge-phenyl short-range (SR) charge-transfer characters, balancing a small ΔEST and a large f. Moreover, the incorporation of dual equivalent multiresonance-acceptors is found to double the f value without affecting the ΔEST. A large radiative decay rate over an order of magnitude higher than the intersystem crossing (ISC) rate, and a decent reverse ISC rate of >106 s-1 are simultaneously obtained in one emitter, leading to a short delayed-lifetime of ~0.88 μs. The corresponding organic light-emitting diode exhibits a record-high maximum external quantum efficiency of 40.4% with alleviated efficiency roll-off and extended lifetime." @default.
- W4367052004 created "2023-04-27" @default.
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- W4367052004 date "2023-04-26" @default.
- W4367052004 modified "2023-10-14" @default.
- W4367052004 title "High-efficiency and stable short-delayed fluorescence emitters with hybrid long- and short-range charge-transfer excitations" @default.
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- W4367052004 doi "https://doi.org/10.1038/s41467-023-38086-4" @default.
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