4,5-diazafluorene-incorporated ter(9,9-diarylfluorene): A novel molecular doping strategy for improving the electron injection property of a highly efficient OLED blue emitter

A more efficient OLED device with blue emission characteristic of terfluorene has been achieved by using a novel molecular doping strategy, in which 4,5-diazafluorene was incorporated as the substitution group of terfluorene to facilitate electron injection from the metal cathode yet without altering emission characteristics.