Efficient Charge Balance of Green Organic Light Emitting Diodes Using Mixed Charge Transporting Materials as the Host

被引：1

作者：

Yang, Hyung Jin ^{[1
]}

Lee, Ho Won ^{[1
]}

Lee, Seok Jae ^{[1
]}

Lee, Song Eun ^{[1
]}

Lee, Dong Hyung ^{[1
]}

Koo, Ja Ryong ^{[1
]}

Yoon, Jhin Yeong ^{[2
]}

Yoon, Seung Soo ^{[2
]}

Kim, Young Kwan ^{[1
]}

机构：

[1] Hongik Univ, Dept Informat Display, Seoul 121791, South Korea

[2] Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea

来源：

MOLECULAR CRYSTALS AND LIQUID CRYSTALS | 2014年 / 599卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

energy transfer; charge balance; Organic light emitting diode; roll-off ratio; mixed host;

D O I：

10.1080/15421406.2014.935977

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The mixed layer for an emitting layer (EML) consists of two materials 4,4 ',4 ''-tris(N-carbazolyl)-triphenylamine (TCTA) and 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) without host material. A series of EML structures were fabricated with three types of single mixed layers (mixing ratio 2:1, 1:2) and double mixed layers (mixing ratio 2:1/1:2), and the EML of using double mixed layer was optimized. The maximum luminous efficiency (LE) and quantum efficiency (QE) were 62.07 cd/A, 18.92%, respectively. Moreover, the roll-off ratio of LE was 20.42% at 20,000 cd/m(2). Interestingly, this result shows the roll-off ratio was reduced roughly 50% compared to the reference device.

引用

页码：145 / 152

页数：8

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