Oligocarbazole-silane Connected Host Materials Having High Triplet Energies

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  • Lin Xu
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • Hattori Takashi
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • Yagai Shiki
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • Kitamura Akihide
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • Karatsu Takashi
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University

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We report the novel oligomer host material derived from 3,6-carbazole and diphenylsilane. Through the σ-Si structure, tetraphenylsilane moieties effectively interrupt the extending of &pai;-conjugation, triplet energy level of the host material increased to 2.95 eV successfully in oligomer chain. In addition, this oligomer host material exhibited high glass transition temperature (Tg = 119 °C) and matching HOMO (-5.57 eV) and LUMO (-2.12 eV) level with both electrodes. Employing the host material doped with green and blue-emitters as the emissive layer, we fabricated light-emitting diodes by solution processing, the maximum luminance for blue device was 454 cd/m2.

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