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

Junyuan Liu, Yunhui Zhu (), Taiju Tsuboi, Chao Deng, Weiwei Lou, Dan Wang, Tiangeng Liu and Qisheng Zhang ()
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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

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32607-3

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