文献类型：期刊文献

英文题名：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]; Shi, Lijiang[1]; Gao, Lei[3]; Hu, Peijun[3]; Mu, Haichuan[2]; Xia, Zhenyuan[4]; Huang, Jinhai[4]; Su, Jianhua[1]

机构：[1] Key Laboratory for Advanced Materials, Institute of Fine Chemicals, East China University of Science and Technology, Shanghai, 200237, China; [2] Department of Physics, School of Science, East China University of Science and Technology, Shanghai, 200237, China; [3] School of Chemistry and Chemical Engineering, Queen's University, Belfast, BT7 1NN, United Kingdom; [4] Shanghai Taoe Chemical Technology Co., Ltd, Shanghai, 200030, China

年份：2018

卷号：10

期号：6

起止页码：5714

外文期刊名：ACS Applied Materials and Interfaces

收录：EI(收录号：20180804813248)

语种：英文

外文关键词：Electroluminescence - Phosphorescence - Polycyclic aromatic hydrocarbons - Organic light emitting diodes (OLED) - Sound insulating materials - Synthesis (chemical) - Current density - Molecular orbitals

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 (ηext) 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 ηc of 40.4 cd/A and 17.8%, respectively, with the color rendering index value of 75. ? 2018 American Chemical Society.