Role of ultrathin Alq3 and LiF layers in conjugated polymer light-emitting diodes

被引：31

作者：

Deng, XY

Tong, SW

Hung, LS ^{[1
]}

Mo, YQ

Cao, Y

机构：

[1] City Univ Hong Kong, COSDAF, Hong Kong, Hong Kong, Peoples R China

[2] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China

[3] S China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2003年 / 82卷 / 18期

关键词：

D O I：

10.1063/1.1571654

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report that an ultrathin layer of tris-(8-hydroxyquinoline) aluminum (Alq(3)) interposed between a bilayer cathode of LiF/Al and an emissive layer can significantly improve electroluminescence efficiency in a polymer light-emitting device (PLED). At a current density of 35 mA/cm(2), a poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenyl-enevinylene] (MEH-PPV)-based PLED with a cathode of Alq(3)/LiF/Al has a quantum efficiency of 2.5%, considerably higher than that of a MEH-PPV-based PLED with a bare Al or a LiF/Al cathode. Interfacial characteristics of MEH-PPV/LiF/Al and MEH-PPV/Alq(3)/LiF/Al were investigated by photoelectron spectroscopy, and the results were used to explain the difference in device performance. (C) 2003 American Institute of Physics.

引用

页码：3104 / 3106

页数：3

共 16 条

[1] LiF/Al cathodes and the effect of LiF thickness on the device characteristics and built-in potential of polymer light-emitting diodes [J].