Elucidation of the electron injection mechanism of evaporated cesium carbonate cathode interlayer for organic light-emitting diodes

被引：104

作者：

Li, Yang ^{[1
]}

Zhang, De-Qiang ^{[1
]}

Duan, Lian ^{[1
]}

Zhang, Rui ^{[1
]}

Wang, Li-Duo ^{[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 | 2007年 / 90卷 / 01期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2429920

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Vacuum evaporated Cs2CO3 has been proven to be an efficient electron injection material for organic light-emitting diodes. In our study, an improved quartz crystal microbalance method has been adopted to investigate the electron injection mechanism of evaporated Cs2CO3. It is concluded that Cs2CO3 decomposes to metallic cesium during thermal evaporation and the thin layer of metallic cesium that is deposited onto the organic layer is responsible for the enhanced electron injection. The metallic cesium mechanism reveals that the function of the Cs2CO3 interlayer is independent of the cathode metal, which has also been verified by our experiments. (c) 2007 American Institute of Physics.

引用

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