LiF Layer at the Interface of Au Cathode in Organic Light-Emitting Devices: A Nonchemical Induced Carrier Injection Enhancement

被引：28

作者：

Sun, Zhengyi ^{[1
]}

Ding, Baofu ^{[2
]}

Wu, Bo ^{[1
]}

You, Yintao ^{[1
]}

Ding, Xunmin ^{[1
]}

Hou, Xiaoyuan ^{[1
]}

机构：

[1] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[2] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Hong Kong, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 03期

基金：

中国国家自然科学基金;

关键词：

ENERGY-LEVEL ALIGNMENT; ELECTRON INJECTION; DIODES; ELECTROLUMINESCENCE; PENTACENE; ALUMINUM; METALS;

D O I：

10.1021/jp205871a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Au is not a suitable cathode material of organic light-emitting device because of its high work function resulting in poor electron injection. However, in present work, it is found that the performance of Au-cathode OLEDs can be efficiently improved by introducing a LiF buffer layer and with its optimal thickness can even be comparable to that of conventional Al-cathode device. The relationship between the thickness of LiF layer and the performance improvement is investigated. The experimental results indicate a quite different mechanism of LiF thin layer from that of Al-cathode device, which is not chemical-reaction-mechanism-dominant. Other insulator material buffer layers such as Al2O3 and BCP are also investigated.

引用

页码：2543 / 2547

页数：5

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