Optimizing the Charge Balance of Fluorescent Organic Light-Emitting Devices to Achieve High External Quantum Efficiency Beyond the Conventional Upper Limit

被引：143

作者：

Pu, Yong-Jin ^{[1
]}

Nakata, Go ^{[1
]}

Satoh, Fumiya ^{[1
]}

Sasabe, Hisahiro ^{[1
]}

Yokoyama, Daisuke ^{[1
]}

Kido, Junji ^{[1
]}

机构：

[1] Yamagata Univ, Res Ctr Organ Elect, Dept Organ Device Engn, Yonezawa, Yamagata 9928510, Japan

来源：

ADVANCED MATERIALS | 2012年 / 24卷 / 13期

基金：

日本科学技术振兴机构;

关键词：

organic light-emitting devices; charge balance; external quantum efficiency; fluorescence; TRIPLET-TRIPLET ANNIHILATION; MOLECULAR-ORIENTATION; ELECTROLUMINESCENCE; DIODES; MECHANISM; EMISSION;

D O I：

10.1002/adma.201104403

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The external quantum efficiencies (EQEs) of fluorescent light emitting devices are drastically improved by optimizing the charge balance. When N, N'di( naphthalene-1-yl)-N, N'-diphenylbenzidine (NPD) is used as a holetransporting layer (HTL) and Alq3 as an electron-transporting layer (ETL) with the green dopant 2,3,6,7-tetrahydro-1,1,7,7-tetramethyl-1H, 5H, 11H-10-(2benzothiazolyl) quinolizino-[9,9a, 1gh] coumarin (C545T), the EQE is observed to be approximately 3%. However, when the HTL and ETL materials are optimized, a 7.5% external quantum efficiency (EQE) in a green-emitting device and an 8.2% EQE in a blue-emitting device are achieved at 100 cd m-2.

引用

页码：1765 / 1770

页数：6

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