Efficient deep-blue phosphorescent organic light-emitting device with improved electron and exciton confinement

被引：119

作者：

Zheng, Ying ^{[1
]}

Eom, Sang-Hyun ^{[1
]}

Chopra, Neetu ^{[1
]}

Lee, Jaewon ^{[1
]}

So, Franky ^{[1
]}

Xue, Jiangeng ^{[1
]}

机构：

[1] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 22期

关键词：

D O I：

10.1063/1.2937403

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a significant improvement in the efficiency of deep-blue phosphorescent organic light-emitting devices based on the electrophosphorescent dye bis(4',6'-difluorophenylpyridinato)tetrakis (1-pyrazolyl) borate (FIr6). Using 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) as the hole transport layer (HTL), we achieved a maximum external quantum efficiency of eta(EQE)=(18 +/- 1)%, which is approximately 50% higher than eta(EQE)=12% in a previously reported device with bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl as the HTL. The maximum luminous power efficiency was also improved from (14 +/- 1) lm/W to (18 +/- 1) lm/W. We attribute this efficiency improvement to the enhanced electron and exciton confinement provided by TAPC. (C) 2008 American Institute of Physics.

引用

页数：3

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