文献类型：期刊文献

英文题名：[1,2,4]Triazolo[1,5-a]pyridine as Building Blocks for Universal Host Materials for High-Performance Red, Green, Blue and White Phosphorescent Organic Light-Emitting Devices

作者：Song, Wenxuan[1,2];Shi, Lijiang[1,2];Gao, Lei[4];Hu, Peijun[4];Mu, Haichuan[3];Xia, Zhenyuan[5];Huang, Jinhai[5];Su, Jianhua[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Sch Sci, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Fine Chem, Sch Sci, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Dept Phys, Sch Sci, Shanghai 200237, Peoples R China;[4]Queens Univ, Sch Chem & Chem Engn, Belfast BT7 1NN, Antrim, North Ireland;[5]Shanghai Taoe Chem Technol Co Ltd, Shanghai 200030, Peoples R China

年份：2018

卷号：10

期号：6

起止页码：5714

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000425572700064)】；

语种：英文

外文关键词：[1,2,4]triazolo[1,5-a]pyridine; universal host materials; white organic light-emitting diode; high triplet energy; phosphorescent organic light-emitting diodes (PhOLEDs); high efficiency

摘要：The electron-accepting [1,2,4]triazolo[1,5-a]pyridine (TP) moiety was introduced to build bipolar host materials for the first time, and two host materials based on this TP acceptor and carbazole donor, namely, 9,9'-(2-([1,2,4]triazolo[1,5-a]pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (o-CzTP) and 9,9'-(5-([1,2,4]triazolo[1,5-a]pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (m-CzTP), were designed and synthesized. These two TP-based host materials possess a high triplet energy (>2.9 eV) and appropriate highest occupied molecular orbital/lowest unoccupied molecular orbital levels as well as the bipolar transporting feature, which permits their applicability as universal host materials in multicolor phosphorescent organic light-emitting devices (PhOLEDs). Blue, green, and red PhOLEDs based on o-CzTP and m-CzTP with the same device configuration all show high efficiencies and low efficiency roll-off. The devices hosted by o-CzTP exhibit maximum external quantum efficiencies (eta(ext)) of 27.1, 25.0, and 15.8% for blue, green, and red light emitting, respectively, which are comparable with the best electroluminescene performance reported for FIrpic-based blue, Ir(ppy)(3)-based green, and Ir(pq)(2)(acac)-based red PhOLEDs equipped with a single-component host. The white PhOLEDs based on the o-CzTP host and three lumophors containing red, green, and blue emitting layers were fabricated with the same device structure, which exhibit a maximum current efficiency and eta(c) of 40.4 cd/A and 17.8%, respectively, with the color rendering index value of 75.