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Toward a BT.2020 green emitter through a combined multiple resonance effect and multi-lock strategy

Author

Listed:
  • Junyuan Liu

    (Zhejiang University)

  • Yunhui Zhu

    (Zhejiang Hongwu Technology Co., Ltd.)

  • Taiju Tsuboi

    (Zhejiang University)

  • Chao Deng

    (Zhejiang Hongwu Technology Co., Ltd.)

  • Weiwei Lou

    (Zhejiang Hongwu Technology Co., Ltd.)

  • Dan Wang

    (Zhejiang University)

  • Tiangeng Liu

    (Zhejiang University)

  • Qisheng Zhang

    (Zhejiang University
    Zhejiang University)

Abstract

Color-saturated green-emitting molecules with high Commission Internationale de L’Eclairage (CIE) y values have great potential applications for displays and imaging. Here, we linked the outer phenyl groups in multiple-resonance (MR)-type blue-emitting B (boron)-N (nitrogen) molecules through bonding and spiro-carbon bridges, resulting in rigid green emitters with thermally activated delayed fluorescence. The MR effect and multiple interlocking strategy greatly suppressed the high-frequency vibrations in the molecules, which emit green light with a full-width at half-maximum of 14 nm and a CIE y value of 0.77 in cyclohexane. These were the purest green molecules with quantum efficiency and color purity that were comparable with current best quantum dots. Doping these emitters into a traditional green-emitting phosphorescence organic light-emitting diode (OLED) endowed the device with a Broadcast Service Television 2020 color-gamut, 50% improved external quantum efficiency, and an extremely high luminescence of 5.1 × 105 cd/m2, making it the greenest and brightest OLED ever reported.

Suggested Citation

  • Junyuan Liu & Yunhui Zhu & Taiju Tsuboi & Chao Deng & Weiwei Lou & Dan Wang & Tiangeng Liu & Qisheng Zhang, 2022. "Toward a BT.2020 green emitter through a combined multiple resonance effect and multi-lock strategy," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32607-3
    DOI: 10.1038/s41467-022-32607-3
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