Triazolotriazine-based thermally activated delayed fluorescence materials for highly efficient fluorescent organic light-emitting diodes(TSF-OLEDs)

作     者：Rongchuan Su Yuyao Zhao Feng Yang Lian Duan Jingbo Lan Zhengyang Bin Jingsong You 苏蓉川;赵宇垚;杨凤;段炼;兰静波;宾正杨;游劲松

作者机构：College of ChemistrySichuan UniversityChengdu 610064China Key Laboratory of Organic OptoelectronicsDepartment of ChemistryTsinghua UniversityBeijing 100084China 

基　　金：This work was supported by the National Natural Science Foundation of China(21432005) the Fundamental Research Funds for the Central Universities and the Comprehensive Training Platform Specialized Laboratory,College of Chemistry,Sichuan University 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2021年第66卷第5期

页      码：441-448,M0003页

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 rolloff and good color purity. However, the superior examples of TSF-OLEDs are still limited up to ***, a trade-off strategy is presented for designing efficient TADF materials and achieving highperformance 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(ΔE_(ST)) 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 ΔE_(ST), thus achieving a trade-off between small ΔE_(ST) 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.

主 题 词：Thermally activated delayed fluorescence Fluorescent organic light-emitting diodes Electron acceptor Triazolotriazine 

学科分类：08[工学] 080501[080501] 0805[工学-能源动力学] 0803[工学-仪器类] 

核心收录：

D　O　I：10.1016/j.scib.2020.08.023

馆 藏 号：203986042...