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Synthesis of novel s-triazine/carbazole based bipolar molecules and their application in phosphorescent OLEDs

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Abstract

Three s-triazine/carbazole based bipolar molecules: 9,9′,9″-(1,3,5-triazine-2,4,6-triyl)tris(3,6-di-tert-butyl-carbazole) (TazTCz), 9,9′-(6-phenyl-1,3,5-triazine-2,4-diyl)bis(3,6-di-tert-butyl-carbazole) (PhTazDCz) and 9-(4,6-diphenyl-1,3,5-triazine-2-yl)-3,6-di-tert-butyl-carbazole (DPhTazCz) were synthesized and applied as host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs). The triplet state energy levels are ~2.86 eV for these compounds, ensured their application in blue PHOLEDs. X-ray single crystal structural analysis revealed a non-planar structure of TazTCz, which prevented the intermolecular close-packing in the solid state. X-ray diffraction spectra also confirmed that TazTCz and PhTazDCz could form amorphous films with spin-coating method. The bipolar characteristics of as-synthesized compounds were confirmed by carrier mobility measurement. The device parameters of blue PHOLEDs based on these compounds as host materials exhibit that the balance of electron and hole mobilities is benefit for reducing turn-on voltage and efficiency roll-off at high current density.

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Acknowledgments

We acknowledge the financial support from National Natural Science Foundation of China (21176180) and Specialized Research Fund for the Doctoral Program of Higher Education (20130032110026).

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Tianxing Lu, Jing You, Xicheng Liu, Yin Xiao, Xianggao Li & Shirong Wang

  2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China

    Tianxing Lu, Jing You, Xicheng Liu, Yin Xiao, Xianggao Li & Shirong Wang

  3. Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, No. 79 Yingze Street, Taiyuan, 030024, Shanxi, China

    Dan Zhao, Hua Wang & Yanqin Miao

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  1. Tianxing Lu
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  2. Jing You
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  3. Dan Zhao
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  9. Shirong Wang
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Correspondence to Jing You.

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Lu, T., You, J., Zhao, D. et al. Synthesis of novel s-triazine/carbazole based bipolar molecules and their application in phosphorescent OLEDs. J Mater Sci: Mater Electron 26, 6563–6571 (2015). https://doi.org/10.1007/s10854-015-3254-2

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  • DOI: https://doi.org/10.1007/s10854-015-3254-2

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