Impact of the metal cathode on the performance of polymer light-emitting diodes

被引：0

作者：

Stössel, M ^{[1
]}

Wittmann, G ^{[1
]}

Heuser, K ^{[1
]}

Blässing, J ^{[1
]}

Birnstock, J ^{[1
]}

Rogler, W ^{[1
]}

Roth, W ^{[1
]}

Winnacker, A ^{[1
]}

Inbasekaran, M ^{[1
]}

Bernius, MT ^{[1
]}

Wu, W ^{[1
]}

O'Brien, JJ ^{[1
]}

机构：

[1] Siemens AG, D-91052 Erlangen, Germany

来源：

ORGANIC LIGHT-EMITTING MATERIALS AND DEVICES IV | 2000年 / 4105卷

关键词：

polymer LED; luminescence; quenching;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An appropriate choice of the cathode material and the process of cathode deposition is a key issue in the development of polymer light emitting devices. In this paper, we report on the impact of low work function metals on the luminescence efficiency of thin films of polyfluorene type polymers. Photoluminescence as well as electroluminescence experiments are presented, and in both cases, a strong correlation between the metal layer thickness and the luminescence efficiency is demonstrated. By means of time-of-flight secondary ion mass spectroscopy (TOF-SIMS), the distribution of the metal contamination within the polymer layers is determined. The results strongly suggest that impurity quenching of excitons by metal atoms inside the polymer layer takes place and strongly affects luminescence and device efficiency.

引用

页码：92 / 99

页数：8

共 9 条

[1] EFFICIENCY OF CHARGE RECOMBINATION IN ORGANIC LIGHT-EMITTING-DIODES [J].