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 O/sub 2/ plasma-treatments. They lead to a smaller contact angle than organic washing, suggesting an importance of the cleaning of ITO surface. UV ozone-and O/sub 2/ 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. O/sub 2/ plasma-treatment was pointed out to be more effective and convenient for cleaning ITO surface.
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