Phosphorescent organic light emitting diodes with a cross-linkable hole transporting material

A cross-linkable hole transporting material PLEXCORE (R) HTL was incorporated in phosphorescent organic light emitting diodes. This hole transporting material is based on an arylamine derivate. The device performance in terms of efficiency and lifetime was compared to the same devices with a thermally evaporated 4,4'-bis[N-(1-naphthyl)-N-phenylamino] biphenyl (NPB)-based hole transporting layer. The resulting devices with the cross-linkable HTL gave higher efficiency, smaller roll-off and longer lifetime compared with devices with the NPB-based devices. This new hole transporting material paves the road toward solution processed multilayer light emitting devices. (C) 2014 Elsevier B.V. All rights reserved.