Donor–acceptor type material as a triplet host for high efficiency white phosphorescent organic light-emitting diodes

• Improved efficiency in white phosphorescent organic light emitting diodes.
• Donor–acceptor type host structure for bipolar charge transport properties.
• Yellow phosphorescent organic light-emitting diodes with a high quantum efficiency above 25%.

Highly efficient white phosphorescent organic light-emitting diodes (OLEDs) were reported using a donor–acceptor type material as a host material. A donor–acceptor type material, 10-phenyl-10H-spiro[acridine-9,9′-fluorene]-2′,7′-dicarbonitrile (ACRFLCN), was doped with a yellow emitting iridium(III) bis(4-phenylthieno[3,2-c]pyridinato-N,C2′) acetylacetonate (PO-01) dopant and high quantum efficiency of 26.9% was realized in the yellow phosphorescent OLEDs using the ACRFLCN host material. Efficient energy transfer and bipolar charge transport properties of ACRFLCN increased the quantum efficiency of the PO-01 doped yellow phosphorescent OLEDs. In addition, white phosphorescent OLEDs with the PO-01 doped ACRFLCN yellow emitting layer exhibited a high quantum efficiency of 22.8% and a high power efficiency above 50.0 lm/W.

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