Numerical study on ITO surface modification technique to improve single emissive layer based organic light emitting diode performance

Abstract

To improve the performance and operational life time of an organic light emitting diode (OLED), a single uniformly mixed-host (MH) emissive layer (EML) based OLED structure with modified anode surface has been proposed in this work. Through the numerical simulation, the feasibility of the proposed modified work function of ITO based device structure has been justified from the electrical characteristics and efficiency curves. By the ITO surface modification technique, the interfacial energy barrier of ITO/EML is reduced enough to increase hole injection rate into the EML. Therefore, the carriers become more balanced which raise the recombination rate in the EML. From the calculated current balance factor from the simulation results, it is confirmed that due to ITO surface modification, the proposed MH-OLED able to give better performance in terms of brightness, efficiency and longer operating time over unmodified ITO based MH-OLED.