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Keywords:

  • Bipolar host;
  • Electrophosphorescence,·Full-color displays;
  • OLEDs
Thumbnail image of graphical abstract

The bipolar host material BCPO (bis-4- (N-carbazolyl)phenylphosphine oxide) containing a phosphine oxide and two carbazole groups, synthesized in three steps, shows a high triplet energy gap of 3.01 eV. The material can be used as a universal host for blue, green, and red phosphorescent devices, all giving extremely high efficiencies with turn-on voltages within 3 V.