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All-fluorescence white organic light-emitting diodes with record-beating power efficiencies over 130 lm W‒1 and small roll-offs

Author

Listed:
  • Hao Liu

    (South China University of Technology)

  • Yan Fu

    (South China University of Technology)

  • Ben Zhong Tang

    (The Chinese University of Hong Kong)

  • Zujin Zhao

    (South China University of Technology)

Abstract

Improving power efficiency (PE) and reducing roll-off are of significant importance for the commercialization of white organic light-emitting diodes (WOLEDs) in consideration of energy conservation. Herein, record-beating PE of 130.7 lm W−1 and outstanding external quantum efficiency (EQE) of 31.1% are achieved in all-fluorescence two-color WOLEDs based on a simple sandwich configuration of emitting layer consisting of sky-blue and orange delayed fluorescence materials. By introducing a red fluorescence dopant, all-fluorescence three-color WOLEDs with high color rendering index are constructed based on an interlayer sensitization configuration, furnishing ultrahigh PE of 110.7 lm W−1 and EQE of 30.8%. More importantly, both two-color and three-color WOLEDs maintain excellent PEs at operating luminance with smaller roll-offs than the reported state-of-the-art WOLEDs, and further device optimization realizes outstanding comprehensive performances of low driving voltages, large luminance, high PEs and long operational lifetimes. The underlying mechanisms of the impressive device performances are elucidated by host-tuning effect and electron-trapping effect, providing useful guidance for the development of energy-conserving all-fluorescence WOLEDs.

Suggested Citation

  • 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.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32967-w
    DOI: 10.1038/s41467-022-32967-w
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    References listed on IDEAS

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    1. 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.
    2. Yiru Sun & Noel C. Giebink & Hiroshi Kanno & Biwu Ma & Mark E. Thompson & Stephen R. Forrest, 2006. "Management of singlet and triplet excitons for efficient white organic light-emitting devices," Nature, Nature, vol. 440(7086), pages 908-912, April.
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