Poly(p-phenylene ethynylene)-based light-emitting devices

被引：100

作者：

Montali, A ^{[1
]}

Smith, P ^{[1
]}

Weder, C ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Dept Mat, Inst Polymers, CH-8092 Zurich, Switzerland

来源：

SYNTHETIC METALS | 1998年 / 97卷 / 02期

关键词：

poly(p-phenylene ethynylene); electroluminescence; light-emitting diodes;

D O I：

10.1016/S0379-6779(98)00120-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We here report polymer light-emitting diodes with substituted poly(p-phenylene ethynylenes) as the emissive layer. Yellow-green electroluminescence was observed for different poly(p-phenylene ethynylene) derivatives. Surprisingly, and importantly in view of stability issues, devices with an aluminium cathode were found to have a higher external quantum efficiency (0.035%) and a lower onset voltage for electroluminescence (10.8 V) than those with a calcium cathode. These results are explained in terms of a lower energy barrier for electron injection than for hole injection, consistent with the ionization potential of poly(p-phenylene ethynylenes) which was determined to be 6.3 eV below vacuum level with ultraviolet photoelectron spectroscopy and 5.8 eV with cyclovoltammetry. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：123 / 126

页数：4

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