Isomeric thermally activated delayed fluorescence emitters based on indolo[2,3-<i>b</i>]acridine electron-donor: a compromising optimization for efficient orange–red organic light-emitting diodes
作者:Jia-Xiong Chen、Wen-Wen Tao、Ya-Fang Xiao、Shuang Tian、Wen-Cheng Chen、Kai Wang、Jia Yu、Feng-Xia Geng、Xiao-Hong Zhang、Chun-Sing Lee
DOI:10.1039/c8tc06081a
日期:——
lowest singlet and triplet excited states as well as the oscillator strengths (fs) are two contradictory factors controlling performance of thermally activated delayed fluorescence (TADF) emitters. To figure out their optimum balance, we developed two orange–red isomeric TADF emitters 12-(13,13-dimethyl-5-phenyl-5,13-dihydro-11H-indolo[2,3-b]acridin-11-yl)dibenzo[a,c]dipyrido[3,2-h:2′,3′-j]phenazine
最低单重态和三重态激发态之间的能量差(ΔE ST s)以及振荡器强度(f s)是控制热激活延迟荧光(TADF)发射器性能的两个矛盾因素。为了找出它们的最佳平衡,我们开发了两个橙红色异构TADF发射体12-(13,13-二甲基-5-苯基-5,13-二氢-11 H-吲哚[2,3- b ] ac啶11 yl)dibenzo [ a,c ] dipyrido [3,2- h:2',3'- j ] phenazine(IDAC-BPPZ)和12-(13,13-二甲基-11-苯基-11,13-dihydro- 5 H-吲哚并[2,3 - b ] ac啶-5-基)二苯并[a,c ] dipyrido [3,2- h:2',3'- j ] phenazine(ACID-BPPZ),它们通过相同的电子给体(D)和相同的电子受体(A)核通过不同的连接站点。ACID-BPPZ具有较弱的D-A共轭,可实现0.02