P‐176: Degradation of Blue Phosphorescent and Fluorescent Organic Light‐Emitting Diodes with Thermal Stress

We investigated the influence of external thermal stress on blue OLEDs annealed various temperature to compare their properties to those of pristine device. Current density‐voltage‐luminance and lifetime decrease due to thermal stress, and we also used impedance spectroscopy, to obtain detailed measurements to determine the degradation mechanisms of the devices.