Thermally Decomposable Lithium Nitride as an Electron Injection Material for Highly Efficient and Stable OLEDs

被引：24

作者：

Duan, Lian ^{[1
]}

Liu, Qian ^{[1
]}

Li, Yang ^{[1
]}

Gao, Yudi ^{[1
]}

Zhang, Guohui ^{[1
]}

Zhang, Deqiang ^{[1
]}

Wang, Liduo ^{[1
]}

Qiu, Yong ^{[1
]}

机构：

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 30期

关键词：

LIGHT-EMITTING-DIODES; WORK-FUNCTION; DEVICES; CATHODE; LAYER; PERFORMANCE; MECHANISM; METALS; ALUMINUM; IMPACT;

D O I：

10.1021/jp901510j

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：

Improvement of electron injection is essential for highly efficient low-voltage organic light-emitting diodes (OLEDs). In this work, we report our study on thermally decomposable Li3N as the electron injection layer (EIL) for OLEDs. We use a quartz crystal microbalance method to investigate the decomposition process of Li3N during vacuum thermal evaporation in situ. Thermodynamics study also proves that Li3N decomposes in vacuum to form metallic lithium and nitrogen. OLEDs with Li3N as the EIL outperform those with conventional LiF in every respect of view. An optimized green OLED with a Li3N EIL shows 35% higher efficiency and more than doubled lifetime compared with the control device with a LiF EIL.

引用

页码：13386 / 13390

页数：5

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