High-efficiency and stable short-delayed fluorescence emitters with hybrid long- and short-range charge-transfer excitations

Guoyun Meng, Hengyi Dai, Qi Wang, Jianping Zhou, Tianjiao Fan, Xuan Zeng, Xiang Wang, Yuewei Zhang, Dezhi Yang, Dongge Ma, Dongdong Zhang () and Lian Duan ()
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Guoyun Meng: Tsinghua University
Hengyi Dai: Tsinghua University
Qi Wang: Tsinghua University
Jianping Zhou: Tsinghua University
Tianjiao Fan: Tsinghua University
Xuan Zeng: Tsinghua University
Xiang Wang: Tsinghua University
Yuewei Zhang: Tsinghua University
Dezhi Yang: South China University of Technology
Dongge Ma: South China University of Technology
Dongdong Zhang: Tsinghua University
Lian Duan: Tsinghua University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-38086-4

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