Electroluminescence properties of organic light-emitting diodes using ITO with different surface treatments

Author

Iwama, Y. ; Cho, D.C. ; Mori, T. ; Mizutani, T.

Author_Institution

Dept. of Electr. Eng., Nagoya Univ., Japan

Volume

2

fYear

2003

fDate

1-5 June 2003

Firstpage

718

Abstract

In order to investigate the effects of the surface condition of indium-tin-oxide (ITO) substrate on electroluminescence (EL) properties of organic light-emitting diode (OLED), ITO substrates were cleaned by different cleaning methods. Two kinds of cleaning methods were introduced in this work; UV ozone- and O₂ plasma-treatments. They lead to a smaller contact angle than organic washing, suggesting an importance of the cleaning of ITO surface. UV ozone-and O₂ plasma-treatments reduced a threshold voltage of OLED. However, these treatments could not improve the EL efficiency per current density, because they affect the hole injection from ITO into organic layer, but not the recombination process. O₂ plasma-treatment was pointed out to be more effective and convenient for cleaning ITO surface.

Keywords

brightness; current density; electroluminescence; organic light emitting diodes; plasma materials processing; surface cleaning; ultraviolet radiation effects; EL efficiency; ITO; InSnO; O₂ plasma-treatment; OLED; UV ozone treatment; cleaning; contact angle; current density; electroluminescence properties; hole injection; indium-tin-oxide substrate; organic light-emitting diodes; surface treatments; threshold voltage; Atmospheric measurements; Cleaning; Electroluminescence; Indium tin oxide; Liquid crystal displays; Organic light emitting diodes; Plasma applications; Plasma density; Plasma displays; Surface treatment;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on

ISSN

1081-7735

Print_ISBN

0-7803-7725-7

Type

conf

DOI

10.1109/ICPADM.2003.1218518

Filename

1218518