Electro-thermal modeling of different LEP-thickness white OLEDs

In our project the final purpose is to develop a cost-effective roll-to-roll technology of fabricating large-surface, high-output OLED (organic light emitting diode) devices for intelligent lighting applications. The electrical and optical characteristics of multi-layered OLEDs depend on the thickness of the layers. To reach the highest efficiency in an application is needed to optimize the each layers. In this paper we have measured the I-V characteristics of the different LEP (light emitting polymer) thickness white OLEDs. We have examined in 50degC wide temperature range. We have created an electro-thermal model, which describe the temperature and LEP thickness dependence of the forward bias. The results work as the feedback for the fabrication process and the OLED planning to our project partner.