Abstract
Two novel phenylcarbazole/diphenylphosphine oxide derived, alcohol soluble host materials for solution-processed, blue phosphorescent organic light-emitting devices were designed and synthesized. The thermal stability, photophysical and electrochemical properties of these host materials have been investigated in detail. These hosts both exhibited high triplet energy levels, which ensure efficient energy transfer from hosts to the triplet emitter iridium(III) bis(4,6-difluorophenylpyridinato)picolinate. The new host compounds also showed good film morphology and bipolar charge transport properties. Multilayer solution-processed blue electrophosphorescent organic light-emitting diodes using the new host compounds with the triplet emitter iridium(III) bis(4,6-difluorophenylpyridinato)picolinate exhibited high luminance efficiency of 27.8 cd A−1, which was outstanding with respect to other work reported for solution-processed blue PhOLEDs.
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