文献类型：期刊文献

英文题名：New carbazole-based bipolar hosts for efficient green phosphorescent organic light -emitting diodes

作者：Bao, Liyuan[1,2];Zhu, Jiangnan[1,2];Song, Wenxuan[1,2];Zhou, Haitao[1,2];Huang, Jinhai[1,2];Mu, Haichuan[3];Su, Jianhua[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Sci, Dept Phys, Shanghai 200237, Peoples R China

年份：2020

卷号：83

外文期刊名：ORGANIC ELECTRONICS

收录：;EI(收录号：20201508396113);WOS:【SCI-EXPANDED(收录号:WOS:000540949900017)】；

基金：We thank the financial support from the NSFC/China (21788102, 21790361), Shanghai Municipal Science and Technology Major Project (Grant No.2018SHZDZX03), the Programme of Introducing Talents of Discipline to Universities (B16017).

语种：英文

外文关键词：Phosphorescence - Sound insulating materials - Organic light emitting diodes (OLED) - Decomposition - Efficiency - Polycyclic aromatic hydrocarbons

摘要：In this work, two new bipolar host materials 3-(5-(9H-carbazol-9-yl)-4'-(1-phenyl-1H-benzo[d]imidazole-2-yl)-[1,1′-biphenyl]-2-yl)-9- phenyl-9H-carbazole (BCZ-PBM) and 3-(5-(9H-carbazol-9-yl)-3'-(4,6- diphenyl-1,3,5-triazin-2-yl)-[1,1′-biphenyl]-2-yl)-9-phenyl-9H-carbazole (BCZ-TRZ) were designed and synthesized by introducing benzimidazole and triazine groups as acceptor units with carbazole as the donor unit. These two compounds have excellent thermal stability with a high glass transition temperature (Tg > 160 °C) and thermal decomposition temperature (Td > 450 °C). Green phosphorescent organic light-emitting devices (PHOLEDs) D1 and D2 were obtained by doping Ir(ppy)3 into BCZ-PBM and BCZ-TRZ, in which BCZ-PBM based device D1 revealed better performance with an external quantum efficiency (EQE) of 20.4%, maximum current efficiency (CE) of 69.3 cd/A, and maximum power efficiency (PE) of 54.8 lm/W. Notably, the BCZ-PBM-based device exhibited excellent efficacy stability and a low efficiency roll-off of 1.7% at 1000 cd/m2 and 4.7% at 5000 cd/m2. ? 2020 Elsevier B.V.