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[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
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-02-05 00:00:00 , DOI: 10.1021/acsami.7b18202
Wenxuan Song , Lijiang Shi , Lei Gao 1 , Peijun Hu 1 , Haichuan Mu , Zhenyuan Xia 2 , Jinhai Huang 2 , Jianhua Su
Affiliation  

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.

中文翻译:

[1,2,4]三唑并[1,5- a ]吡啶作为高性能红色,绿色,蓝色和白色磷光有机发光器件通用主体材料的基石

首次引入电子接受性的[1,2,4]三唑并[1,5- a ]吡啶(TP)部分以构建双极性主体材料,并基于该TP受体和咔唑供体建立了两种主体材料,即,9,9'-(2-([[1,2,4] triazolo [1,5 - a ]吡啶-2-基)-1,3-亚苯基)双(9 H-咔唑)(o -CzTP)和9,9'-(5-([[1,2,4] triazolo [1,5 - a ]吡啶-2-基)-1,3-亚苯基)双(9 H-咔唑)(m-CzTP),进行了设计和合成。这两种基于TP的基质材料具有较高的三重态能量(> 2.9 eV)和适当的最高占据分子轨道/最低未占据分子轨道水平以及双极传输特征,这使其可作为通用基质材料应用于多色磷光有机光发射器件(PhOLED)。具有相同设备配置的基于o -CzTP和m -CzTP的蓝色,绿色和红色PhOLED均显示出高效率和低效率滚降。由主办的设备Ô(-CzTP表现出最大外部量子效率η EXT)分别发出27.1%,25.0%和15.8%的蓝色,绿色和红色光,这与基于FIrpic的蓝色,Ir(ppy)3的绿色和Ir(pq)的最佳电致发光性能相当2个(基于acac)的红色PhOLED,配备有单组分主机。基于在白色PHOLED中ö -CzTP主机和含有红色,绿色,和蓝色的发光层的三个lumophors用相同的器件结构,其表现出的最大电流效率和η被制造Ç分别40.4坎德拉/ A和17.8%,的,显色指数值为75。
更新日期:2018-02-05
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