Alkoxy encapsulation of carbazole-based thermally activated delayed fluorescent dendrimers for highly efficient solution-processed organic light-emitting diodes
作者:Zhihua Ma、Yuchun Wan、Wenyue Dong、Zhenjun Si、Qian Duan、Shiyang Shao
DOI:10.1016/j.cclet.2020.06.025
日期:2021.2
Two n-butoxy-encapsulated dendritic thermally activated delayed fluorescent (TADF) emitters (namely O-D1 and O-D2) with the first-/second-generation carbazoledendrons are designed and synthesized via CN coupling between carbazoledendrons and 2,4,6-tris(4-bromophenyl)-1,3,5-triazine core. It is found that, compared with the commonly-used tert-butyl groups, the use of n-butoxy encapsulation groups can
通过咔唑与2,4,6之间的C N偶联,设计并合成了两个正丁氧基封装的树枝状热活化延迟荧光(TADF)发射体(分别为O-D1和O-D2)和第一代/第二代咔唑。 -三(4-溴苯基)-1,3,5-三嗪核心。已发现,与通常使用的叔丁基相比,使用正丁氧基包封基团可以使树枝状聚合物的单峰-三峰能隙更小,产生更强的TADF效应以及更快的逆系统间交叉过程。利用烷氧基封装的树枝状聚合物O-D1进行溶液处理的TADF有机发光二极管(OLED)作为发射极的O1和O-D2具有最先进的器件效率,最大外部量子效率分别高达16.8%和20.6%,是叔丁基封装的对应物的约1.6倍和约2.0倍。这些结果表明,基于咔唑的TADF树状聚合物的烷氧基封装可能是开发用于溶液处理的OLED的高效发射体的有前途的方法。