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

Author

Listed:
  • 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
    Tsinghua University)

  • Dezhi Yang

    (South China University of Technology)

  • Dongge Ma

    (South China University of Technology)

  • Dongdong Zhang

    (Tsinghua University
    Tsinghua University)

  • Lian Duan

    (Tsinghua University
    Tsinghua University)

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.

Suggested Citation

  • Guoyun Meng & Hengyi Dai & Qi Wang & Jianping Zhou & Tianjiao Fan & Xuan Zeng & Xiang Wang & Yuewei Zhang & Dezhi Yang & Dongge Ma & Dongdong Zhang & Lian Duan, 2023. "High-efficiency and stable short-delayed fluorescence emitters with hybrid long- and short-range charge-transfer excitations," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38086-4
    DOI: 10.1038/s41467-023-38086-4
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    1. M. A. Baldo & D. F. O'Brien & Y. You & A. Shoustikov & S. Sibley & M. E. Thompson & S. R. Forrest, 1998. "Highly efficient phosphorescent emission from organic electroluminescent devices," Nature, Nature, vol. 395(6698), pages 151-154, September.
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