Managing triplet excitons to enhance performance of blue OLED materials (Conference Presentation)

Abstract

Triplet-triplet annihilation provides a way to generate stable, high energy (blue) emission from organic light-emitting diodes via the fusion of low energy triplet excitons. Low energy sensitizers can be used to populate the triplet states of the emitter, which allows low voltages can be used. However, these same sensitizers can also quench the emission of the high energy singlet in the emitter layer. Managing the motion of triplet excitons by adding a triplet-diffusion-singlet-blocking layer allows us to decouple the sensitization and emission events, preventing singlet quenching and enhancing the blue emission by a factor of 10 or more.