Effect of broad recombination zone in multiple quantum well structures on lifetime and efficiency of blue organic light-emitting diodes

被引：12

作者：

Lee, Seok Jae ^{[1
]}

Lee, Song Eun ^{[1
]}

Lee, Dong Hyung ^{[1
]}

Koo, Ja Ryong ^{[1
]}

Lee, Ho Won ^{[1
]}

Yoon, Seung Soo ^{[2
]}

Park, Jaehoon ^{[3
]}

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

[3] Hallym Univ, Dept Elect Engn, Chunchon 200702, South Korea

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS | 2014年 / 53卷 / 10期

基金：

新加坡国家研究基金会;

关键词：

ELECTROPHOSPHORESCENT DEVICES; PHOSPHORESCENT EMISSION; ENERGY-TRANSFER; LAYER;

D O I：

10.7567/JJAP.53.101601

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Blue phosphorescent organic light-emitting diodes with multiple quantum well (MQW) structures (from one to four quantum wells) within an emitting layer (EML) are fabricated with charge control layers (CCLs) to control carrier movement. The distributed recombination zone and balanced charge carrier injection within EML are achieved through the MQW structure with CCLs. Remarkably, the half-decay lifetime of a blue device with three quantum wells, measured at an initial luminance of 500 cd/m(2), is 3.5 times longer than that using a conventional structure. Additionally, the device's efficiency improved. These results are explained with the effects of triplet exciton confinement and triplet-triplet annihilation within each EML. (C) 2014 The Japan Society of Applied Physics

引用

页数：5

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