Synthesis and properties of binaphthyl chiral thermally activated delayed fluorescence molecules using thioxanthone as acceptor
作者:Xiangyu Dong、Shaogang Shen、Yuanyuan Qin、Xiaoxiao Hu、Honglei Gao、Guanhao Liu、Teng Gao、Zhi Pang、Pengfei Wang、Ying Wang
DOI:10.1016/j.cclet.2023.108311
日期:2023.3
binaphthyl skeleton are limited by intrinsic fluorescence properties, resulting in generally low device efficiencies (EQE < 5%) of related organic light emitting diodes (OLEDs). Herein, we designed and synthesized four pair of chiral binaphthyl enantiomers (R/S-1−R/S-4) adopting acceptor-donor-donor-acceptor (ADDA) structure by introducing different thioxanthone modification groups on the 3,3′-position
目前报道的基于联萘骨架3,3'-取代的轴向手性分子受到固有荧光特性的限制,导致相关有机发光二极管(OLED)的器件效率普遍较低(EQE < 5%)。在此,我们通过在3,3'-上引入不同的噻吨酮修饰基团,设计并合成了四对采用受体-供体-供体-受体(ADDA)结构的手性联萘对映体(R/S - 1− R / S - 4)2,2'-亚甲二氧基-1,1'-联萘的位置。其中发射器R/S - 2和R/S - 4通过增强分子内电荷转移获得的样品由于在1个CT和3个LE状态之间相对较小的ΔE ST (0.12eV和0.17eV)以及相对适中的SOC矩阵元素(0.28cm -1和0.10cm -1 )而表现出TADF特性。这些对映异构体在稀释溶液中的 CD 光谱显示出完美的镜像和有机小分子 (10 -4 -10 -3 ) 合理的gabs。基于发射极S - 2和S - 4的器件A和B的外量子效率(EQE)分别为10