High triplet energy exciplex host derived from a CN modified carbazole based n-type host for improved efficiency and lifetime in blue phosphorescent organic light-emitting diodes

被引：54
|
作者：
Shin, Su Kyeong [1 ]
Han, Si Hyun [1 ]
Lee, Jun Yeob [1 ]
机构：
[1] Sungkyunkwan Univ, Sch Chem Engn, 2066 Seobu Ro, Suwon 440746, Gyeonggi, South Korea
来源：
JOURNAL OF MATERIALS CHEMISTRY C | 2018年 / 6卷 / 38期
基金：
新加坡国家研究基金会;
关键词：
LOW DRIVING VOLTAGE; QUANTUM EFFICIENCY; CONVERSION; OLEDS;
D O I：
10.1039/c8tc02918k
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High triplet energy exciplexes which can improve the lifetime of blue phosphorescent organic light-emitting diodes were developed by mixing a carbazole based hole transport type host with a CN modified carbazole based electron transport type host. The electron transport type host was designed to have an electron withdrawing CN functional unit at the central core and CN substituted carbazole for electron transport properties. The mixing of the two hosts generated an exciplex which has a high triplet energy of 2.94 eV and singlet energy of 3.30 eV. The exciplex host realized a high external quantum efficiency of 18.8% and extended the lifetime by more than 1.8 times in blue phosphorescent organic light-emitting diodes.
引用
收藏
页码：10308 / 10314
页数：7
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