Efficient organic light emitting diode with plasma polymerization of thiophene

초록

In organic light emitting diode (OLED), anodes are commonly formed of a conductive and transparent oxide. Indium-tin-oxide (ITO) has been widely used as the anode because of its transparency, good conductivity and high work function. However, a device formed on a bare ITO surface usually shows insufficient hole injection and poor operational stability. The mitigation of these problems has involved interposing an intermidiate layer between the ITO and organic medium and exposing the ITO to a glow discharge in oxygen ambient. In this work, we utilized plasma polymerization at radio frequencies to deposit a thiophene thin film (PPTh) on ITO, and the effect of PPTh on the device efficiency and stability has also been investigated.