Study on the Cathode used for Transparent Organic Light Emitting Diodes

We made study of the comparative characteristic of transparent organic light emitting diodes by using three kinds of typical transparent conducting oxide ( ITO (In2O3-SnO2), IZO (In2O3-ZnO), AZO (ZnO-Al2O3) ). The cathode used for transparent conducting oxide were prepared by rf magnetron sputtering at room temperature. Each transparent conduction film was amorphous. We also study the effects of using alkali metal (Cs) dope layer. An electronic injection improved by doping Cs, and the decrease in driving voltage of TOLED and the improvement of luminance were observed.