Correlation between electroluminescence efficiency and stability in organic light-emitting devices under pulsed driving conditions

We investigated the effect of using pulsed current (pc) versus direct current (dc) driving mode on the electroluminescence (EL) efficiency and operational stability of tris(8-hydroxy-quinoline)aluminum (AlQ3)-based organic light-emitting devices. The results show that the dependence of device stability on the driving mode correlates with the relative EL efficiency under the pc and dc driving modes, where the mode that gives higher EL efficiency at any given current density also gives higher operational stability regardless of the duty cycle.