Stable efficiency roll-off in phosphorescent organic light-emitting diodes

被引：98

作者：

Kim, Sung Hyun ^{[2
]}

Jang, Jyongsik ^{[2
]}

Yook, Kyoung Soo ^{[1
]}

Lee, Jun Yeob ^{[1
]}

机构：

[1] Dankook Univ, Dept Polymer Sci & Engn, Yongin 448701, Kyeonggi, South Korea

[2] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151742, South Korea

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 02期

关键词：

D O I：

10.1063/1.2836270

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency roll-off was significant in the device with narrow recombination zone (RZ) and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage. Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90% of maximum quantum efficiency at a luminance of 20 000 cd/m(2). (c) 2008 American Institute of Physics.

引用

页数：3

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