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

Bingfu Lei, Ken Ichi Machida, Takashi Horikawa, Hiromasa Hanzawa

研究成果: 書籍の章/レポート/Proceedings会議への寄与査読

6 被引用数 (Scopus)

抄録

Reddish-orange emitting long-lasting phosphorescence phosphor Ca 2Si5N8:Eu2+,Tm3+ has been prepared by solid-state reaction method using cheaper CaH2 as calcium source. Upon UV light excitation, Ca2Si5N 8: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 Eu 2+ 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.

本文言語英語
ホスト出版物のタイトル2nd International Conference on Smart Materials and Nanotechnology in Engineering
DOI
出版ステータス出版済み - 2009
イベント2nd International Conference on Smart Materials and Nanotechnology in Engineering - Weihai, 中国
継続期間: 2009 7月 82009 7月 11

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
7493
ISSN(印刷版)0277-786X

会議

会議2nd International Conference on Smart Materials and Nanotechnology in Engineering
国/地域中国
CityWeihai
Period09/7/809/7/11

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