Preparation of Ca2Si5N8:Eu2+,Tm3+ phosphor by calcium hydride and its afterglow properties

Bingfu Lei; Ken-ichi Machida; Takashi Horikawa; Hiromasa Hanzawa

doi:10.1117/12.840402

20 October 2009 Preparation of Ca₂Si₅N₈:Eu²⁺,Tm³⁺ phosphor by calcium hydride and its afterglow properties

Bingfu Lei, Ken-ichi Machida, Takashi Horikawa, Hiromasa Hanzawa

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74936U (2009) https://doi.org/10.1117/12.840402
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

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.

Citation Download Citation

Bingfu Lei, Ken-ichi Machida, Takashi Horikawa, and Hiromasa Hanzawa "Preparation of Ca₂Si₅N₈:Eu²⁺,Tm³⁺ phosphor by calcium hydride and its afterglow properties", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74936U (20 October 2009); https://doi.org/10.1117/12.840402

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