Study on Cathode Compositions and Electron Injection for Efficient Polymer Light-Emitting Diodes

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  • KIN Zenken
    Osaka University, Center for Advanced Science and Innovation (CASI)
  • KAJII Hirotake
    Osaka University, Center for Advanced Science and Innovation (CASI)
  • OHMORI Yutaka
    Osaka University, Center for Advanced Science and Innovation (CASI)

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Other Title
  • 色素分散型高分子系有機ＥＬ素子の高効率化へ向けた陰極構成と電子注入機構の検討
  • シキソ ブンサンガタ コウブンシケイ ユウキ EL ソシ ノ コウコウリツカ エ ムケタインキョク コウセイ ト デンシ チュウニュウ キコウ ノ ケントウ

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Abstract

The effects of electron injection in polymer light-emitting diodes that are based on the phosphorescent material of fac-tris (2-phenylpyridine) iridium (Ir(ppy)3) devices with CsF/MgAg/Ag cathodes were investigated. The coexistence of CsF and MgAg resulted in efficient electron injection. The performances of air-exposed devices with CsF and Cs cathodes were different. The deposition orders of 3 nm-thick CsF and 1 nm-thick MgAg were independently necessary to achieve efficient electron injection. In the case of the device with Cs/MgAg cathode, however, to achieve the efficient electron injection, it is necessary for Cs to exist just on the organic layer. We suggest that the electron injection effects between devices with CsF and those with Cs are different.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 63 (10), 681-685, 2006

    The Society of Polymer Science, Japan

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