Full Electrothermal OLED Model Including Nonlinear Self-heating Effects

Organic LEDs present pronounced electrothermal feedback, which is problematic for high-current-density applications such as lighting in the automobile sector, or optical pumping. A model that can describe device behavior over a wide range of current densities and temperatures is, therefore, highly desired. The authors' approach splits the device into three physically meaningful components, explicitly taking recombination into account. This intuitive picture of the different operating regimes and voltage losses enables the authors to analyze the LED's nonlinear self-heating, including the characteristic voltage turnover, and narrow down the origins of the strong electrothermal feedback.