High-performance sky-blue phosphorescent organic light-emitting diodes employing wide-bandgap bipolar host materials with thermally activated delayed fluorescence characteristics
作者:Yuan-Lan Zhang、Quan Ran、Qiang Wang、Qi-Sheng Tian、Fan-Cheng Kong、Jian Fan、Liang-Sheng Liao
DOI:10.1016/j.orgel.2020.105660
日期:2020.6
Up to date, several kinds of thermally activated delayed fluorescence (TADF) host molecules have been rapidly developed to fulfill the increasing demand of high-efficiency phosphorescent organic light-emitting diodes (PHOLEDs). Herein, three wide-bandgap TADF materials BPCN-Cz2Ph, BPCN-2Cz, and BPCN-3Cz are newly designed and synthesized as host materials for sky-blue PHOLEDs. By modulation of carbazole-units
迄今为止,已经快速开发了几种热活化延迟荧光(TADF)主体分子,以满足对高效磷光有机发光二极管(PHOLED)的日益增长的需求。在此,新设计并合成了三种宽带隙TADF材料BPCN-Cz2Ph,BPCN-2Cz和BPCN-3Cz作为天蓝色PHOLED的主体材料。通过调节分子骨架中的咔唑单元,我们发现优化的分子可以实现高三线态能量和平衡的载流子传输特性,并具有明显的TADF特性。采用BPCN-Cz2Ph,BPCN-2Cz和BPCN-3Cz的具有超低磷光体掺杂率的天蓝色PHOLED主体材料证明符合缓解滚降的非常高的性能和取得不俗的电流效率46.5光盘的(CES)-1,50.0光盘-1和34.5光盘-1 40.6流明的W,功率效率(PES)- 1,46.8流明w ^ -1,和34.8流明w ^ -1,和分别为22.2%,24%,和15.8%,外部量子效率(EQEs)。更令人鼓舞的是,即使在施加的亮度为1000