Acridine derived stable host material for long lifetime blue phosphorescent organic light-emitting diodes

• Acridine derived host material as a strong hole transport type host material.
• High quantum efficiency by hole and electron balance in the emitting layer.
• Long lifetime by recombination zone management using the hole transport type acridine host.

A host material having acridine as a hole transport moiety, 10-(3′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-9,9-dimethyl-9,10-dihydroacridine (CZBPAC), was explored as the host material of phenylimidazole type Ir triplet emitter to realize both high quantum efficiency and stable operational lifetime. The acridine containing CZBPAC was superior to carbazole based host material with the same backbone structure in that it can improve driving voltage, quantum efficiency and lifetime of the blue phosphorescent organic light-emitting diodes simultaneously.

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