基于咔唑-三唑的新型主体材料及天蓝光有机电致磷光器件

doi:10.7517/j.issn.1674-0475.2017.04.033

影像科学与光化学 ›› 2017, Vol. 35 ›› Issue (5): 729-735.DOI: 10.7517/j.issn.1674-0475.2017.04.033

基于咔唑-三唑的新型主体材料及天蓝光有机电致磷光器件

王芳, 李久艳

大连理工大学化工学院精细化工国家重点实验室, 辽宁大连 116024

收稿日期:2017-06-01 修回日期:2017-06-13 出版日期:2017-09-15 发布日期:2017-09-15
通讯作者: 李久艳
基金资助:
国家自然科学基金项目（21374013，21421005）和中央高校基本科研业务费（DUT16ZD221）资助

Novel Trizazole-carbazole Based Host Material for Sky-blue Electrophosphorescent Devices

WANG Fang, LI Jiuyan

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China

Received:2017-06-01 Revised:2017-06-13 Online:2017-09-15 Published:2017-09-15

摘要/Abstract

摘要：

本研究针对蓝光主体材料相对缺乏的现状，利用有机电致磷光器件高效率的优势，选择1，2，4-三唑为电子传输功能基团、咔唑为空穴传输功能基团，设计、制备了新型主体材料oCzTz。通过邻位取代方式实现了分子立体构型高度扭曲，从而使分子的三重态能量达到3.01 eV；oCzTz具有较高的热分解温度（353℃）和玻璃化转变温度（110℃）；量化计算显示，分子的前线轨道在咔唑和三唑基团之间高度分离。以oCzTz为主体、以FIrpic为发光客体的天蓝光电致磷光器件启亮电压为3.4 V，电流效率和功率效率分别高达37.2 cd·A^-1和29.2 lm·W^-1，是以TPBI为电子传输层的同类器件的最高效率之一。

关键词: 有机电致发光器件(OLED), 双偶极主体材料, 1, 2, 4-三唑, 天蓝光电致磷光

Abstract:

Phosphorescent organic light-emitting diodes (OLEDs) are advantageous over the traditional fluorescent ones in terms of high efficiency by harvesting both singlet and triplet excitons for light emission. Transition-metal complex phosphors must be dispersed in a certain host matrix to suppress the concentration quenching and triplet-triplet annihilation. Therefore, the host material is as important as the dopant emitter in phosphorescent OLEDs. In this report, a novel host material, oCzTz, was developed by using 1,2,4-triazole as the n-type unit and carbazole as the p-type unit. Ortho-substitution was applied to reach a twisted molecular configuration, which finally leads to high triplet energy of 3.01 eV for oCzTz. oCzTz has high thermal decomposition temperature of 353℃ and glass transition temperature of 110℃. The theoretical calculation results showed that the HOMO and LUMO are highly separated, indicating its bipolar charge transporting feature. oCzTz was used as host material to fabricate sky-blue phosphorescent OLED with FIrpic as the doped emitter, which exhibited a low turn-on voltage of 3.4 V, the high current efficiency of 37.2 cd·A^-1 and the power efficiency of 29.2 lm·W^-1. These are one of the highest efficiencies among the sky-blue phosphorescent OLEDs with TPBI as electron transporting layer.

Key words: organic light-emitting diodes (OLEDs), bipolar host materials, 1,2,4-triazole, sky-blue electrophosphorescence

王芳, 李久艳. 基于咔唑-三唑的新型主体材料及天蓝光有机电致磷光器件[J]. 影像科学与光化学, 2017, 35(5): 729-735.

WANG Fang, LI Jiuyan. Novel Trizazole-carbazole Based Host Material for Sky-blue Electrophosphorescent Devices[J]. Imaging Science and Photochemistry, 2017, 35(5): 729-735.

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基于咔唑-三唑的新型主体材料及天蓝光有机电致磷光器件

Novel Trizazole-carbazole Based Host Material for Sky-blue Electrophosphorescent Devices

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