【摘 要】
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Thermally activated delayed fluorescence (TADF) sensitized fluorescent organic light-emitting diodes (TSF-OLEDs) have shown great potential for the realization
【机 构】
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College of Chemistry, Sichuan University, Chengdu 610064, China;Key Laboratory of Organic Optoelectr
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Thermally activated delayed fluorescence (TADF) sensitized fluorescent organic light-emitting diodes (TSF-OLEDs) have shown great potential for the realization of high efficiency with low efficiency roll-off and good color purity.However,the superior examples of TSF-OLEDs are still limited up to now.Herein,a trade-off strategy is presented for designing efficient TADF materials and achieving high-performance TSF-OLEDs via the construction of a new type of triazolotriazine (TAZTRZ) acceptor,The enhanced electron-withdrawing ability of TAZTRZ acceptor,fused by triazine (TRZ) and triazole (TAZ) together,enables TADF luminogens with small singlet-triplet energy gap (△EsT) values.Meanwhile,the increased planarity from the TRZ-phenyl linkage (6∶6 system) to the TAZ-phenyl linkage (5:6 system) can compensate the decrease of oscillator strength (f) while lowing △EST,thus achieving a trade-off between small △EST and high f.As a result,the related TSF-OLED achieved an extremely low turn-on volt-age of 2.1 V,an outstanding maximum external quantum efficiency (EQEmax) of 23.7％ with small efficiency roll-off (EQE1000 of 23.2％;EQQE5000 of 20.6％) and an impressively high maximum power efficiency of 82.1 lm W-1,which represents the state-of-the-art performance for yellow TSF-OLEDs.
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