Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-24T18:32:42.287Z Has data issue: false hasContentIssue false

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
Affiliation:
[email protected], Osaka University, Center for Advanced Science and Innovation, 2-1 Yamada-Oka, Suita, 565-0871, Japan
Hirotake Kajii
Affiliation:
[email protected], Osaka University, Center for Advanced Science and Innovation, 2-1 Yamada-oka, Suita, 565-0871, Japan
Yutaka Ohmori
Affiliation:
[email protected], Osaka University, Center for Advanced Science and Innovation, 2-1 Yamada-oka, Suita, 565-0871, Japan
Get access

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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Tang, C. W. andVanSlyke, S. A., Appl. Phys. Lett., 51, 913 (1987).Google Scholar
2. Seki, K., Ito, E., andIshii, H., Synthetic. Metals. 91, 137 (1997).Google Scholar
3. Yokoyama, T., Yoshimura, D., Ito, E., Ishii, H., Ouchi, Y., andSeki, K., Jpn. J. Appl. Phys. 42, 3666 (2003).Google Scholar
4. Vaeth, K. M. andDicillo, J., J. Polym. Sci. Part B., 41, 2715 (2003).Google Scholar
5. Kin, Z., Yoshihara, K., Kajii, H., Hayashi, K., Ohmori, Y., Jpn. J. Appl. Phys., 45, 3737 (2006).Google Scholar