Current efficiency in organic light-emitting diodes with a hole-injection layer

被引：39

作者：

Wang, Hui ^{[1
]}

Klubek, Kevin P. ^{[2
,3
]}

Tang, C. W. ^{[2
]}

机构：

[1] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[2] Univ Rochester, Dept Chem Engn, Rochester, NY 14627 USA

[3] Eastman Kodak Co, Res Labs, Rochester, NY 14650 USA

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 09期

关键词：

D O I：

10.1063/1.2978349

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have systematically investigated the effect of layer structures on the current efficiency of prototypical hole-injection layer (HIL)/hole-transport layer (HTL)/electron-transport layer (ETL) organic light-emitting diodes based on 4,4',4 ''-tris[N-(3-methylphenyl)-N-phenylamino]triphenylamine (MTDATA) as the HIL, 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB) as the HTL, and tris(8-quinolinolato)aluminum (Alq) as the ETL. With bilayer devices, the current efficiency is limited by exciplex emissions in the case of MTDATA/Alq and quenching of Alq emissions by NPB(+) radical cations in NPB/Alq. The improved current efficiency in trilayer MTDATA/NPB/Alq devices can be attributed to a reduction in NPB(+) radical cations at the NPB/Alq interface and a strong electric field in the NPB layer. (C) 2008 American Institute of Physics.

引用

页数：3

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