A weak electron transporting material with high triplet energy and thermal stability via a super twisted structure for high efficient blue electrophosphorescent devices

A weak electron transporting material with high triplet energy and thermal stability via a super twisted structure for high efficient blue electrophosphorescent devices
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一种通过超扭曲结构具有高三线态能量和热稳定性的弱电子传输材料,用于高效蓝色电致磷光器件

DOI:
10.1039/c1jm13488d
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发表时间:
2011-11
影响因子:
--
通讯作者:
Ji, Ziwu
Ji, Ziwu
中科院分区:
--
文献类型:
--
作者:
Gong, Qihuang;Qi, Boyuan;Xing, Xing;Zheng, Lingling;Kong, Sheng;Chen, Zhijian;Qu, Bo;Zhang, Lipei;Ji, Ziwu

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合成了一种具有超扭曲结构和高热稳定性的高三线态能量(ET = 3.2 eV)电子传输/空穴阻挡(ET/HB)材料1,2,4,5-四(3-吡啶-3-基苯基)苯(TemPPB)。在蓝色电致磷光器件中使用TemPPB作为ET/HB材料实现了19.6%的外量子效率(EQE),远高于使用传统ET材料3-(4-联苯)-4-苯基-5-(4-叔丁基苯基)-1,2,4-三唑(TAZ)的器件的12.5%的EQE。此外,TemPPB因其超扭曲结构而导致的弱ET性能可以通过LiF的n型掺杂得到增强。通过结合 n 型掺杂和双发射层,实现了 24.5% 的 EQE。这展示了一种设计具有高 ET 和改善蓝色电致磷光器件热稳定性的 ET/HB 材料的替代方法。
A high triplet energy (ET = 3.2 eV) electron transporting/hole blocking (ET/HB) material, 1,2,4,5-tetra(3-pyrid-3-yl-phenyl)benzene (TemPPB) with a super twisted structure and high thermal stability has been synthesized. An external quantum efficiency (EQE) of 19.6% was achieved by using TemPPB as the ET/HB material in a blue electrophosphorescent device, much higher than the EQE of 12.5% for the device using the conventional ET material, 3-(4-biphenyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole (TAZ). In addition, the weak ET property of TemPPB resulting from its super twisted structure can be enhanced via n-type doping with LiF. An EQE of 24.5% was achieved by combining n-type doping and a double-emission layer. This shows an alternative way to design ET/HB materials with high ET and improved thermal stability for blue electrophosphorescent devices.
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