A diphenyl ether bridged, high triplet energy host material for blue phosphorescent organic light-emitting diodes

• High quantum efficiency of 23.5% in blue phosphorescent organic light-emitting diodes.
• High triplet energy of 2.73 eV and high glass transition temperature of 111 °C.
• Carbazole type high triplet energy host material with a diphenylether linkage.

A carbazole type, thermally stable, high triplet energy host material having a diphenylether linkage, 9,9′-(oxybis([1,1′-biphenyl]-4′,3-diyl))bis(9H-carbazole), was synthesized and the device performances of blue phosphorescent organic light-emitting diodes were studied. The new host material exhibited a high glass transition temperature of 111 °C and a high triplet energy of 2.73 eV for energy transfer to blue triplet emitter. Blue devices were fabricated using the new host material and a high quantum efficiency of 23.5% was achieved.

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