Solution-processed Organic Light-emitting Diodes with a Polymeric Hole Transport Layer Crosslinked by Surface Initiated Oxidative Crosslinking

A surface initiated oxidative coupling method of a carbazole compound was used as a fabrication approach of a crosslinked hole transport layer for solution processed organic light-emitting diodes. The surface initiated oxidative coupling method was able to avoid damage by the organic solvent in the manufacturing process. Moreover, the hole transport material was able to prevent exciton quenching by the oxidizing agent and solved the problem of luminous efficiency reduction of the organic light emitting device because the oxidant was not in contact with the emitting layer. As a result, the surface initiated oxidative crosslinking method improved the luminous efficiency and lifetime characteristics of the solution processed organic light-emitting devices.