Preparation and Luminescent Properties of Delafossite-Type CuLaO2 Doped with II-Group Elements

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  • Katsui Akinori
    Department of Materials Chemistry, School of High-Technology for Human Welfare, Tokai University
  • Takahashi Yuhsuke
    Department of Materials Chemistry, School of High-Technology for Human Welfare, Tokai University
  • Matsushita Hiroaki
    Department of Information and Communication Technology, School of High-Technology for Human Welfare, Tokai University

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Other Title
  • ＩＩ族元素を添加したデラフォサイト型ＣｕＬａＯ２の作製と発光特性
  • 2族元素を添加したデラフォサィト型CuLaO2の作製と発光特性
  • 2ゾク ゲンソ オ テンカシタ デラフォサィトガタ CuLaO2 ノ サクセイ ト ハッコウ トクセイ

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Abstract

Single-phase delafossite-type CuMxLa1-xO2 (M=Mg, Ba, Ca, Sr, Mg, Zn, Cd) was synthesized by means of the solid-state reaction of a stoichiometrically mixed powder of binary oxides at 1273 K, for 10 h in an argon flow, and their luminescent properties were investigated. Undoped CuLaO2 exhibited a weak yellow-green photoluminescence-emission band due to the Cu+ interconfiguration transition at room temperature. The effect of II-group element doping on the photoluminescent properties was classified into two types. CuSrxLa1-xO2, CuBaxLa1-xO2 and CuZnxLa1-xO2 (x≤0.01) exhibited the emission slightly shifted to the shorter-wavelength side than that of undoped CuLaO2 and a strong emission intensity, with increasing doping concentration. These emission behaviors in CuSrxLa1-xO2, CuBaxLa1-xO2 and CuCaxLa1-xO2 was considered to be due to the formation of new emission centers upon doping Sr, Ba and Ca, respectively. CuZnxLa1-xO2, CuCdxLa1-xO2 and CuMgxLa1-xO2 (x≤0.01) exhibited the emission similar to one due to the Cu+ interconfiguration transition in undoped CuLaO2 and a weaker emission intensity, with increasing doping.

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