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

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• 作者：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
• 刊名：Organic Letters
• 出版年：2016
• 出版时间：February 19, 2016
• 年：2016
• 卷：18
• 期：4
• 页码：672-675
• 全文大小：328K
• ISSN：1523-7052

文摘

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.