Aging Model for Life Prediction and Simulation of Organic Light-Emitting Diodes (OLEDs)

This paper proposes a dynamic characterization of OLED aging process. The OLEDs are characterized by a very low dynamic resistance as well as a strong capacitive behavior. Moreover, the OLEDs are very sensitive to over-currents. Thus, the OLED control system should be precisely designed to drive the device. The aim of this study is to establish a dynamic electrical model illustrating the OLED characterization over time. This model is used to create a control system for OLEDs taking into account its characteristic deviation over time. In addition, the model is used to examine the control behavior using simulation, showing its behavior during both transient and steady-state. Furthermore, it is possible to predict the drift of the control system with aging. This ensures better performance for the OLEDs over its whole lifetime, which in return increases its lifetime. Moreover, the paper presents a methodology to predict the lifetime of the OLED just by measuring the voltage across the OLED at rated current. Finally, the proposed modeling is validated by studying the aging of a commercially available OLED.