Linearly Polarized Electroluminescence from a Fluorene-Binaphthyl Copolymer

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  • YAMADA Katsumi
    Department of Photonic Information and Media Engineering, Tokyo Polytechnic University
  • URABE Shigeharu
    Department of Photonic Information and Media Engineering, Tokyo Polytechnic University
  • KAWAMURA Satoshi
    Department of Image Engineering, Tokyo Polytechnic University
  • UCHIDA Takayuki
    Department of Image Engineering, Tokyo Polytechnic University
  • OHTSUKA Masao
    Department of Image Engineering, Tokyo Polytechnic University

Bibliographic Information

Other Title
  • ビナフチル‐フルオレン共重合高分子による直線偏光電場発光
  • ビナフチル-フルオレン共重合高分子による直線偏光電場発光
  • ビナフチル フルオレン キョウジュウゴウ コウブンシ ニ ヨル チョクセン ヘンコウ デンバ ハッコウ

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Abstract

Polyfluorenes have emerged as the most attractive blue-green emitting polymers due to their high efficiency and good thermal stability. It is well known, however, that strong interchain interactions, e.g. excimer formation, in these polymers can lead to luminescence quenching and color change. To improve the color stability, a copolymer has been prepared by coupling of binaphthyl with dialkyl fluorene. Electroluminescence devices were fabricated using the copolymer as a light-emitting layer, and their opto-electric characteristics were evaluated and compared with a device using the homopolymer. Virtually no difference was found in the photoluminescence spectrum of the copolymer film before and after annealing process, indicating improved thermal stability by introducing binaphthyl into the polymer chain. The linearly polarized electroluminescence was observed from the device using the copolymer even without rubbing the substrate.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 63 (10), 704-706, 2006

    The Society of Polymer Science, Japan

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