複数のリン光発光層を含有する白色発光デバイス White Electrophosphorescent Devices having Multi-organic Phosphors Doped Layers

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We demonstrate high-efficiency white electrophosphorescence in organic light emitting diodes (OLED) employing blue and red phosphorescent molecules. As an emitting layer, bis[2-(4,6-difluorophenyl)pyridinato- <i>N</i>,<i>C</i><sup><i>2</i><i>’</i></sup>] iridium picolinate (FIrpic) as blue and bis[2-(2’-benzo[4,5-a]thienyl)pyridinato-<i>N</i>,<i>C</i><sup><i>3</i><i>’</i></sup>]iridium (acetylacetonate) [Btp<sub>2</sub>Ir(acac)] as red phosphors were doped into a 4,4’-bis(9-carbazolyl)-2,2’-biphenyl (CBP) host. The OLED characteristics using multi-phosphors doped layers were studied. We focused on suppression of the color change with an increase of a current density while keeping high-efficiency. With an insertion of a 3 nm-thick 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) layer, high η<sub>ext</sub> of 4.9±0.5% and pure white emission of CIE (0.32, 0.33) at 10 mA/cm<sup>2</sup> were achieved. Moreover, the color change with an increase of a current density was suppressed to a certain extent with in an insertion of other buffer layers, CBP and bis[<i>N</i>-(1-naphthyl)-<i>N</i>-phenyl]benzidine (α-NPD).

収録刊行物

  • 電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society

    電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society 124(11), 1053-1058, 2004-11-01

    一般社団法人 電気学会

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各種コード

  • NII論文ID(NAID)
    10013713227
  • NII書誌ID(NCID)
    AN10136312
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03854205
  • NDL 記事登録ID
    7137768
  • NDL 雑誌分類
    ZN31(科学技術--電気工学・電気機械工業)
  • NDL 請求記号
    Z16-793
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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