Controlling Exciton Diffusion in Multilayer White Phosphorescent Organic Light Emitting Devices

Abstract

Fully electrophosphorescent organic LEDs can take advantage of the diffusion of triplets to produce bright white devices with high power and quantum efficiencies. It is shown that the device color can be tuned by varying the thickness and the dopant concentrations in each layer, and by introducing exciton blocking layers between emissive layers. The Figure depicts the device structure used to probe the triplet exciton concentration.