m-Terphenyl-modified carbazole host material for highly efficient blue and green PHOLEDS

摘要

A simple m-terphenyl modified carbazole derivative, 9-phenyl-3,6-bis-[1,1';3'1"]terphenyl-5'-yl-9H-carbazole (CzTP) was developed. By using CzTP as a host material, the PHOLEDs showed the maximum power efficiencies (η_(p,max)) of 55 lm W~(-1) for blue and 113 lm W~(-1) for green, respectively.rnSince the discovery of phosphorescent iridium complexes, those achieve the internal efficiency of phosphorescent organic light-emitting devices (PHOLED) up to 100%, wide-energy-gap phosphorescent materials have gained considerable attention to realize highly efficient PHOLEDs.