Electro-thermal Drift-diffusion simulations for organic light-emitting diodes

A coupled electrothermal model is presented for 1D non-isothermal drift-diffusion simulations to analyze self-heating in organic light-emitting diodes. Governing equations, boundary conditions, discretization scheme and structure preserving properties are discussed. The simulation of simple organic device structures shows that the model can reproduce non-linear electrothermal effects. Thermal parameter variation yields results that are in line with experimentally observed trends. Simulations are shown to reproduce properties of the solution that are predicted from analytic theory. The model achieves successful integration of thermal effects into a full opto-electronic device simulation tool.