Structure-Property Relationship of Pyridoindole-Type Host Materials for High-Efficiency Blue Phosphorescent Organic Light-Emitting Diodes

摘要

The structure-property relationship of pyridoindole-type host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs) was investigated by synthesizing three pyridoindole derivatives modified with dibenzofiiran, dibenzothiophene, and 9-phenyI-carbazole. The 9-phenylcarbazole moiety was better than dibenzofiiran or dibenzothiophene to manage the energy levels and charge-transport properties of the pyridoindole-derived host materials. The PCb-PCz host with the 9-phenylcarbazole moiety showed balanced charge density in the emitting layer and exhibited a high external quantum efficiency of 29.7% in blue PHOLEDs.