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Ladder-like energy-relaying exciplex enables 100% internal quantum efficiency of white TADF-based diodes in a single emissive layer

Author

Listed:
  • Chunmiao Han

    (Heilongjiang University)

  • Ruiming Du

    (Heilongjiang University)

  • Hui Xu

    (Heilongjiang University)

  • Sanyang Han

    (National University of Singapore)

  • Peng Ma

    (Heilongjiang University)

  • Jinkun Bian

    (Heilongjiang University)

  • Chunbo Duan

    (Heilongjiang University)

  • Ying Wei

    (Heilongjiang University)

  • Mingzhi Sun

    (Heilongjiang University)

  • Xiaogang Liu

    (National University of Singapore)

  • Wei Huang

    (Nanjing Tech University
    Northwestern Polytechnical University (NPU))

Abstract

Development of white organic light-emitting diodes based on purely thermally activated delayed fluorescence with a single-emissive-layer configuration has been a formidable challenge. Here, we report the rational design of a donor-acceptor energy-relaying exciplex and its utility in fabricating single-emissive-layer, thermally activated delayed fluorescence-based white organic light-emitting diodes that exhibit 100% internal quantum efficiency, 108.2 lm W−1 power efficiency, and 32.7% external quantum efficiency. This strategy enables thin-film fabrication of an 8 cm × 8 cm thermally activated delayed fluorescence white organic light-emitting diodes (10 inch2) prototype with 82.7 lm W−1 power efficiency and 25.0% external quantum efficiency. Introduction of a phosphine oxide-based acceptor with a steric group to the exciplex limits donor-acceptor triplet coupling, providing dual levels of high-lying and low-lying triplet energy. Transient spectroscopic characterizations confirm that a ladder-like energy relaying occurs from the high-lying triplet level of the exciplex to a blue emitter, then to the low-lying triplet level of the phosphine oxide acceptor, and ultimately to the yellow emitter. Our results demonstrate the broad applicability of energy relaying in multicomponent systems for exciton harvesting, providing opportunities for the development of third-generation white organic light-emitting diode light sources.

Suggested Citation

  • Chunmiao Han & Ruiming Du & Hui Xu & Sanyang Han & Peng Ma & Jinkun Bian & Chunbo Duan & Ying Wei & Mingzhi Sun & Xiaogang Liu & Wei Huang, 2021. "Ladder-like energy-relaying exciplex enables 100% internal quantum efficiency of white TADF-based diodes in a single emissive layer," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23941-z
    DOI: 10.1038/s41467-021-23941-z
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    Cited by:

    1. Lei Hua & Yuchao Liu & Binbin Liu & Zhennan Zhao & Lei Zhang & Shouke Yan & Zhongjie Ren, 2022. "Constructing high-efficiency orange-red thermally activated delayed fluorescence emitters by three-dimension molecular engineering," Nature Communications, Nature, vol. 13(1), pages 1-11, December.
    2. Hao Liu & Yan Fu & Ben Zhong Tang & Zujin Zhao, 2022. "All-fluorescence white organic light-emitting diodes with record-beating power efficiencies over 130 lm W‒1 and small roll-offs," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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