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Study on Electron Injection Effect of Low Molecular Organic Light-emitting Diodes Utilizing LiF/Al and Li/Al Cathode

Published online by Cambridge University Press:  26 February 2011

Zenken Kin ,
Hirotake Kajii  and
Yutaka Ohmori
Zenken Kin
Affiliation:
k-zenken@casi.osaka-u.ac.jp, Osaka University, Center for Advanced Science and Innovation, 2-1 Yamada-Oka, Suita, 565-0871, Japan
Hirotake Kajii
Affiliation:
kajii@casi.osaka-u.ac.jp, Osaka University, Center for Advanced Science and Innovation, 2-1 Yamada-oka, Suita, 565-0871, Japan
Yutaka Ohmori
Affiliation:
ohmori@casi.osaka-u.ac.jp, Osaka University, Center for Advanced Science and Innovation, 2-1 Yamada-oka, Suita, 565-0871, Japan
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Abstract

The electron injection effects of organic light-emitting diodes (OLED) from the cathode interface between LiF or Li and Al on the tris-(8-hydroxyquinolinato) aluminum (Alq3) emissive layer have been investigated. Efficient electron injection was achieved in the case of thin layer of LiF or Li deposited on Alq3 emissive layer at the thickness of 0.5 nm and 2 nm, respectively. The results indicate that the coexistence of LiF and Al layer or the Li and Al layer on the Alq3 emissive layer result in the efficient electron injection. Electron injection effect in the case of LiF/Al and Li/Al electrode configurations and also the effect of air explosion during the electrode formation have been discussed. In the case of the device with Li, the diffused Li in the Al layer acts as the efficient carrier injection process.

Keywords

organicoptical propertiesoptoelectronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S03-09
Copyright
Copyright © Materials Research Society 2007

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References

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