Numerical model for current conduction in single layer organic light-emitting devices including both bulk and injection effects

Abstract

A numerical model for current conduction in single layer OLEDs including both injection and bulk effects is proposed. Based upon this model, the dependences of current on the barrier height, device thickness and operation voltage, as well as the field distribution, are numerically investigated. It is found that the barrier height at the injection electrode limits the current conduction much more than the thickness of the organic layer, and, except near the electrodes, the electric field is nearly linearly distributed versus the distance from the injection electrode in the organic bulk, and the slope of the distribution decreases as the barrier height increases.