Effect of Alumina Sources on the Fluorescence Properties of Long Persistent Phosphor, SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup>

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  • KUBOYAMA Masashi
    Dept. of Chemistry for Materials, Graduate School of Engineering, Mie University Research and Development Division, Shachihata Inc.
  • FURUSAWA Homare
    Dept. of Chemistry for Materials, Graduate School of Engineering, Mie University
  • MORI Daisuke
    Dept. of Chemistry for Materials, Graduate School of Engineering, Mie University
  • TAKEDA Yasuo
    Dept. of Chemistry for Materials, Graduate School of Engineering, Mie University
  • YAMAMOTO Osamu
    Dept. of Chemistry for Materials, Graduate School of Engineering, Mie University
  • ASAHINO Kinya
    Research and Development Division, Shachihata Inc.
  • KAMIYA Kenji
    Research and Development Division, Shachihata Inc.
  • IMANISHI Nobuyuki
    Dept. of Chemistry for Materials, Graduate School of Engineering, Mie University

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Other Title
  • 長残光性蛍光体SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>, Dy<sup>3+</sup>の特性に及ぼすアルミナ原料の影響
  • 長残光性蛍光体SrAl₂O₄:Eu²⁺,Dy³⁺の特性に及ぼすアルミナ原料の影響
  • チョウ ザンコウセイ ケイコウタイ SrAl ₂ O ₄:Eu ² ⁺,Dy ³ ⁺ ノ トクセイ ニ オヨボス アルミナ ゲンリョウ ノ エイキョウ

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<p>The long afterglow phosphor SrAl2O4:Eu2+, Dy3+ with various particle size and shape were prepared by solid state reaction at 1200~1500°C for 3 h. In the synthesis, five kinds of α-Al2O3 were used as the starting materials, whose particle size ranged between submicron and a hundred micron orders. The peak intensity of excitation and emission spectra and the afterglow life time depended on the size of calcined particle, showing the higher performance with the larger particle size. SrAl2O4:Eu2+, Dy3+ synthesized using the alumina with a few micron size of primary particle but forming 50 μm of secondary particles showed high particle growth rate even at the low calcination temperature of 1200°C, giving almost the similar particle size until at 1500°C. Accordingly, the phosphorescence property was also independent on the calcined temperature. On the other hand, SrAl2O4:Eu2+, Dy3+ prepared from the alumina with 0.1~0.5 μm of dispersed particles depended largely on the calcined temperature, showing the highest performance for the samples prepared at 1400~1500°C. The large particles with smooth surface were effective for the high emission and afterglow properties.</p>

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