Journal
NATURE PHOTONICS
Volume 16, Issue 11, Pages 803-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41566-022-01083-y
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Funding
- National Natural Science Foundation of China [52130308]
- Shenzhen Science and Technology Program [KQTD20170330110107046, ZDSYS20210623091813040]
- China Postdoctoral Science Foundation [2021M692183]
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This study reports a heavy-atom incorporating emitter, BNSeSe, based on a selenium-integrated boron-nitrogen skeleton, which exhibits high photoluminescence quantum yield and fast reverse intersystem crossing rate. By utilizing BNSeSe, green OLEDs demonstrate high operational efficiency and significantly reduced efficiency roll-off at high brightness.
Organic light emitters based on multiresonance-induced thermally activated delayed fluorescent materials have great potential for realizing efficient, narrowband organic light-emitting diodes (OLEDs). However, at high brightness operation, efficiency roll-off attributed to the slow reverse intersystem crossing (RISC) process hinders the use of multiresonance-induced thermally activated delayed fluorescent materials in practical applications. Here we report a heavy-atom incorporating emitter, BNSeSe, which is based on a selenium-integrated boron-nitrogen skeleton and exhibits 100% photoluminescence quantum yield and a high RISC rate (k(RISC)) of 2.0 x 10(6) s(-1). The corresponding green OLEDs exhibit excellent external quantum efficiencies of up to 36.8% and ultra-low roll-off character at high brightnesses (with very small roll-off values of 2.8% and 14.9% at 1,000 cd m(-2) and 10,000 cd m(-2), respectively). Furthermore, the outstanding capability to harvest triplet excitons also enables BNSeSe to be a superior sensitizer for a hyperfluorescence OLED, which shows state-of-the-art performance with a high excellent external quantum efficiency of 40.5%, power efficiency beyond 200 lm W-1, and luminance close to 20,0000 cd m(-2). Green OLEDs based on BNSeSe offer high operational efficiency and reduced efficiency roll-off.
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