DOI: 10.1016/j.scib.2020.08.023
论文题名: Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes (TSF-OLEDs)
作者: Su R. ; Zhao Y. ; Yang F. ; Duan L. ; Lan J. ; Bin Z. ; You J.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期: 5 起始页码: 441
结束页码: 448
语种: 英语
中文关键词: 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)
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170392
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Science Bulletin,2021-01-01,66(5)