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Orthogonally Substituted Benzimidazole-Carbazole Benzene As Universal Hosts for Phosphorescent Organic Light-Emitting Diodes

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posted on 2016-02-01, 00:00 authored by Jau-Jiun Huang, Yu-Hsiang Hung, Pei-Ling Ting, Yu-Ning Tsai, Huan-Jie Gao, Tien-Lung Chiu, Jiun-Haw Lee, Chi-Lin Chen, Pi-Tai Chou, Man-kit Leung
The novel ambipolar hosts of o-CbzBz and o-DiCbzBz contain carbazole and benzimidazole through an ortho-connection. The orthogonal conformations cause the triplet state to be confined at the carbazole units to secure efficient energy transfer. The phosphorescent organic light-emitting diodes (PhOLEDs) show a high current efficiency, power efficiency, and low efficiency roll-off. o-DiCbzBz can be used as a host for sky-blue, green, and orange-red PhOLEDs, giving 57.5, 78.4, and 60.3 cd/A, respectively.

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