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

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 (eta(p,) (max)) of 55 lm W-1 for blue and 113 lm W-1 for green, respectively.