Improved efficiency and stable lifetime in blue phosphorescent organic light-emitting diodes using a stable exciton blocking layer

Abstract

An acridine derived compound, 1,3-bis(9,9-dimethylacridin-10(9H)-yl)benzene (mAP), was investigated as a high triplet energy hole transport material for improved efficiency and stable lifetime. The mAP hole transport material showed a high triplet energy of 3.04 eV and good hole transport properties by the acridine moiety. The introduction of mAP as the hole transport layer of blue phosphorescent organic light-emitting diodes doubled the quantum efficiency of the device while keeping the lifetime of the control device without the mAP hole transport layer.