Effects of interlayers on phosphorescent blue organic light-emitting diodes

被引：54

作者：

Lee, Jonghee ^{[1
]}

Lee, Jeong-Ik ^{[1
]}

Song, Ki-Im ^{[1
]}

Lee, Su Jin ^{[1
]}

Chu, Hye Yong ^{[1
]}

机构：

[1] Elect & Telecommun Res Inst, Convergence Components & Mat Res Lab, Taejon 305350, South Korea

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 20期

关键词：

D O I：

10.1063/1.2936837

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate that the electroluminescence efficiencies of blue organic light-emitting diodes can be significantly enhanced by the incorporation of interlayers at the hole transporting layer (HTL)/emitting layer (EML) and/or EML/electron transporting layer (ETL) interfaces. Blue light-emitting iridium(III)bis(4,6-difluorophenyl)-pyridinato-N,C-2') picolinate was doped in an m-bis-(triphenylsilyl)benzene (UGH3) host and hole transporting wide band gap materials were introduced between the HTL and the EML as interlayers in order to block triplet exciton quenching and reduce electron overflow. The effects of adding a second undoped UGH3 interlayer at the EML/ETL interface were also studied. When the appropriate interlayers were added, the device performances were found to be dramatically enhanced, with peak external quantum and power efficiencies of 20.1% and 29.2 lm/W. (C) 2008 American Institute of Physics.

引用

页数：3

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