Carbazole modified terphenyl based high triplet energy host materials for blue phosphorescent organic light-emitting diodes

• Carbazole modified terphenyl based high triplet energy host materials.
• High quantum efficiency of 20.2% in blue phosphorescent organic light-emitting diodes.
• High triplet energy over 2.70 eV for blue devices.

Carbazole modified terphenyl based high triplet energy host materials were developed for application as host materials for blue phosphorescent organic light-emitting diodes. Two terphenyl based materials, 9-(5″-phenyl-[1,1′:2′,1″:3″,1′′′-quaterphenyl]-3-yl)-9H-carbazole (CzTPPh) and 9-(3″,5″-di(pyridin-3-yl)-[1,1:2′,1″-terphenyl]-3-yl)-9H-carbazole (CzTPPy), were synthesized as the host materials with high triplet energies of 2.75 eV and 2.73 eV, respectively. The two host materials were evaluated as the host materials for blue phosphorescent organic light-emitting diodes and high quantum efficiencies of 20.2% and 15.7% were obtained in the CzTPPh and CzTPPy devices, respectively.

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