文献类型：期刊文献

英文题名：Imidazo[1,2-b]pyridazine as Building Blocks for Host Materials for High-Performance Red-Phosphorescent Organic Light-Emitting Devices

作者：Song, Wenxuan[2,3];Xu, Qihao[2,3];Zhu, Jiangnan[2,3];Chen, Yi[2,3];Mu, Haichuan[4];Huang, Jinhai[1];Su, Jianhua[2,3]

机构：[1]Shanghai Taoe Chem Technol Co Ltd, Shanghai 200030, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Adv Mat, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Coder, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Sci, Dept Phys, Shanghai 200237, Peoples R China

年份：2020

卷号：12

期号：17

起止页码：19701

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20202108687933);WOS:【SCI-EXPANDED(收录号:WOS:000529924800049)】；

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

语种：英文

外文关键词：imidazo[1,2-b]pyridazine; electron-transporting unit; host materials; PhOLEDs; deep red-emitting

摘要：A novel electron-transporting unit, imidazo [1,2-b]pyridazine (IP), was first reported for developing host materials. The IP moiety possesses excellent electron-transporting ability and great thermal stability. Using carbazole as p-type units and IP as n-type units, several bipolar host materials, namely, IP6Cz, IP68Cz, IP36Cz, and IP368Cz, were developed through altering the substitution site of the IP core. Among these four materials, 6-site-substituted IP6Cz and 6,8-site-substituted IP68Cz exhibit the best electroluminescence (EL) performance. IP6Cz- and IP68Cz-based red phosphorescent organic light-emitting diodes using Ir(pq)(2)acac as the emitter exhibit extremely high EL efficiency with the maximum external quantum efficiency (eta(ext,max)) of 26.9 and 25.2% and an insignificant efficiency roll-off. Moreover, IP6Cz- and IP68Cz-based deep-red devices doped by Ir(piq)(2)acac also show satisfactory EL performance with a eta(ext,max) of 20.5 and 19.9%, respectively. The influence of different substitution sites of the IP core on the photophysical and electrochemical properties was systematically investigated. This study demonstrates that IP could be a first-rate electron-transporting unit for bipolar materials for red-emitting devices.