气候变化领域集成服务门户(CCPortal): Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs)

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DOI	10.1016/j.scib.2020.08.023
	Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs)
	Su R.; Zhao Y.; Yang F.; Duan L.; Lan J.; Bin Z.; You J.
发表日期	2021
ISSN	20959273
起始页码	441
结束页码	448
卷号	66 期号:5
英文摘要	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 (ΔEST) 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 ΔEST, thus achieving a trade-off between small ΔEST and high f. As a result, the related TSF-OLED achieved an extremely low turn-on voltage of 2.1 V, an outstanding maximum external quantum efficiency (EQEmax) of 23.7% with small efficiency roll-off (EQE1000 of 23.2%; EQE5000 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. © 2020 Science China Press
关键词	Electron acceptor Fluorescent organic light-emitting diodes Thermally activated delayed fluorescence Triazolotriazine
英文关键词	Economic and social effects; Fluorescence; Quantum theory; Electron-withdrawing ability; External quantum efficiency; Low efficiency roll offs; Low turn-on voltages; Oscillator strengths; Singlet-triplet energy gap; State-of-the-art performance; Thermally activated delayed fluorescences; Organic light emitting diodes (OLED)
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207558
作者单位	College of Chemistry, Sichuan University, Chengdu, 610064, China; Key Laboratory of Organic Optoelectronics, Department of Chemistry, Tsinghua University, Beijing, 100084, China
推荐引用方式 GB/T 7714	Su R.,Zhao Y.,Yang F.,et al. Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs)[J],2021,66(5).
APA	Su R..,Zhao Y..,Yang F..,Duan L..,Lan J..,...&You J..(2021).Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs).Science Bulletin,66(5).
MLA	Su R.,et al."Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs)".Science Bulletin 66.5(2021).