Stabilization of bluish-green luminescent Ce^<3+> centers and electrical properties by Rb doping in SrS:Ce thin film electroluminescent devices

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  • SASAKURA Asuka
    Department of Electrical and Electric Engineering, Tottori University
  • FUKADA Haruki
    Department of Electrical and Electric Engineering, Tottori University
  • KIMURA Takahiro
    Department of Electrical and Electric Engineering, Tottori University
  • OHMI Koutoku
    Department of Electrical and Electric Engineering, Tottori University
  • TANAKA Shosaku
    Department of Electrical and Electric Engineering, Tottori University
  • KOBAYASHI Hiroshi
    Department of Electrical and Electric Engineering, Tottori University

Bibliographic Information

Other Title
  • Rb添加によるSrS:Ce薄膜EL素子の青色純度とEL動作の安定性の改善(材料・デバイス連合研究会)
  • Rb添加によるSrS:Ce薄膜EL素子の青色純度とEL動作の安定性の改善
  • Rb テンカ ニ ヨル SrS Ce ハクマク EL ソシ ノ アオイロ ジュンド ト EL ドウサ ノ アンテイセイ ノ カイゼン

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Abstract

It is revealed that electroluminescence (EL) spectra of bluish-green luminescent Ce^<3+> centers can be stabilized by Rb doping for SrS:Ce thin film EL devices prepared by an electron-beam evaporation method. It is also foud that Rb doping results in reduction of current spike of EL devices indicating suppression of Ce^<3+>-V_<Sr> complex center formation. For the transparent SrS:Ce, Rb device even without a postdeposition annealing, the bluish-green EL corresponding the Commission Internationale de l'Eclairage (CIE) color coordinate of (0.18, 0.34) was obtained with a luminance of 193 cd/m^2 under 1 kHz pulse drive at 40 V above the threshold voltage. The luminance of the SrS:Ce, Rb EL device was improved to be 206 cd/m^2 by annealing at 650℃ while keeping almost the same CIE color coordinate.

Journal

  • ITE Technical Report

    ITE Technical Report 26.45 (0), 13-18, 2002

    The Institute of Image Information and Television Engineers

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