Synthesis and device properties of carbazole/benzimidazole-based host materials |
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Authors: | Mingming Hu Wenxuan Song Jinhai Huang Zhenyuan Xia Jianhua Su |
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Institution: | 1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Shanghai 200237, China;2. Shanghai Taoe Chemical Technology Co., Ltd, Shanghai, China;3. Institute for Organic Synthesis and Photoreactivity-ISOF, National Research Council, via Gobetti 101, 40129 Bologna, Italy |
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Abstract: | We report two bipolar host materials bearing hole-transport benzofurocarbazole/indenocarbazole cores and an electron-transport benzimidazole moiety for red phosphorescence organic light emitting devices (PhOLEDs). The two novel host materials exhibited excellent physical properties with high thermal stabilities, appropriate HOMO-LUMO energy levels and balanced charge transport. Both of them were applied to fabricate red PhOLEDs as promising host materials, and 7,7-dimethyl-5-(4′-(1-phenyl-1H-benzod]imidazol-2-yl)-1,1′-biphenyl]-4-yl)-5,7-dihydroindeno2,1-b]carbazole (ICBI) based device demonstrated outstanding electroluminescence performance with the maximum current efficiency, power efficiency and external quantum efficiency of 33.0 cd/A, 13.9 lm/W and 18.9%, respectively. |
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Keywords: | Benzimidazole Carbazole Host Red PhOLEDs |
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