A simple carbazole-N-benzimidazole bipolar host material for highly efficient blue and single layer white phosphorescent organic light-emitting diodes

摘要

A new simple carbazole-N-benzimidazole bipolar luminogen mNBICz was constructed and utilized as a host for an Flrpic-doped blue device, and exhibited high efficiencies with a η_(EQE,max) of 26.2%, a η_(C,max) of 54.5 cd A~(-1) and a η_(P,max) of 52.2 lm W~(-1). Furthermore, a two-color, all-phosphor single layer white device displayed a η_(EQE,max) of 22.9%, a η_(C,max) of 62.5 cd A~(-1) and a η_(P,max) of 60.4 lm W~(-1).