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Preparation of Ca2Si5N8:Eu2+,Tm3+ phosphor by calcium hydride and its afterglow properties
Author(s): Bingfu Lei; Ken-ichi Machida; Takashi Horikawa; Hiromasa Hanzawa
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Paper Abstract

Reddish-orange emitting long-lasting phosphorescence phosphor Ca2Si5N8:Eu2+,Tm3+ has been prepared by solid-state reaction method using cheaper CaH2 as calcium source. Upon UV light excitation, Ca2Si5N8:Eu2+,Tm3+ phosphor gave a broad band emission peaking at ca. 600 nm. Furthermore, after irradiation by the UV or visible light (in the range of 250-400 nm) for 3 min, the same colored intense afterglow based on the 4f65d1→4f7 transition of Eu2+ ion was observed on the phosphor codoped with 0.5 at% of Eu2+ and Tm3+ ions, and its afterglow can be seen with the naked eye in the dark clearly for more than 1 h after removal of the excitation source. The afterglow decay curve contained fast decay and slow decay components. The substitution of Mg2+ to Ca2+ ions or addition of excessive Ca2+ ions into the phosphor matrix to modify the defect environment were effective to improve the afterglow properties.

Paper Details

Date Published: 20 October 2009
PDF: 9 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74936U (20 October 2009); doi: 10.1117/12.840402
Show Author Affiliations
Bingfu Lei, Osaka Univ. (Japan)
Jinan Univ. (China)
Ken-ichi Machida, Osaka Univ. (Japan)
Takashi Horikawa, Osaka Univ. (Japan)
Hiromasa Hanzawa, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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