Organic cesium salt as an efficient electron injection material for organic light-emitting diodes

被引：20

作者：

Xie, Kai ^{[1
]}

Qiao, Juan ^{[1
]}

Duan, Lian ^{[1
]}

Li, Yang ^{[1
]}

Zhang, Deqiang ^{[1
]}

Dong, Guifang ^{[1
]}

Wang, Liduo ^{[1
]}

Qiu, Yong ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Minist Educ, Beijing 100084, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 18期

关键词：

caesium compounds; charge injection; doping; organic compounds; organic light emitting diodes; organic semiconductors; surface chemistry; thin films;

D O I：

10.1063/1.3012377

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Cesium quinoline-8-oxide (Csq), as an organic salt, was synthesized and applied as an electron injection material for organic light-emitting diodes. A typical bilayer structure of N,N-'-bis-(1-naphthyl)-N,N-'-diphenyl-1,1(')-biphenyl-4,4(')-diamine/tris-(8-hydroxy-quinolinolato) aluminum (III) (Alq(3)) was used to evaluate the electron injection of Csq. The results showed Csq/Al had better electron injection than LiF/Al cathode, and a maximum current efficiency of 4.13 cd/A (3.33 cd/A for LiF/Al) was obtained when the Csq layer is 2.0 nm. It is proposed that the enhanced electron injection by Csq is related to the interfacial chemical reaction between Csq and Al and the self-doping of Csq by librated Cs.

引用

页数：3

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