An indole derivative as a high triplet energy hole transport material for blue phosphorescent organic light-emitting diodes

• DOI: 10.1016/j.tsf.2013.09.084
• Publication Date: 2013-10-04T00:02:35Z
• Authors: Min Su Park; Jun Yeob Lee
• Keywords: Acridine; Quantum Efficiency

Abstract A thermally stable high triplet energy material derived from an indoloacridine core and indole hole transport units, 8,8-bis(4-(1H-indol-1-yl)phenyl)-8H-indolo[3,2,1-de]acridine (BIPIA), was synthesized as the hole transport material for deep blue phosphorescent organic light-emitting diodes. The BIPIA hole transport material showed a high triplet energy of 2.95 eV and high glass transition temperature of 142 °C. A high quantum efficiency of 19.3% was obtained in the deep blue device using BIPIA as the high triplet energy hole transport material.