The Performance of OLEDs Improved by Co-doping PEDOT: PSS Films

In order to overcome the problems of strong acidity, low conductivity of PEDOT: PSS which as hole injection layer in OLEDs, an appropriate amount of imidazole and cesium iodide was co-doping into PEDOT: PSS to prepare efficient OLEDs. The results show that co-doping can effectively adjust the acidity and alkalinity of PEDOT: PSS, improve the hole injection capacity of PEDOT: PSS, so that the carrier transport is more balanced. Compared with OLEDs with pure PEDOT: PSS as hole injection layer, the maximum luminance and current efficiency of the optimized device are increased by 30% and 31%, respectively. This study provides theoretical and experimental reference for the research of doping PEDOT: PSS as hole injection layer in the field of OLEDs.