Enhancement of green long lasting phosphorescence in CaSnO(3):Tb(3+) by addition of alkali ions

Long lasting phosphors of CaSnO(3):Tb(3+) added alkali ions (Li(+), Na(+), K(+)) were prepared by solid-state reaction. The phosphorescence of samples consists of a group of green emission lines originating from (5)D(4) arrow right (7)F(J) transitions of Tb(3+). The afterglow spectra and concentrati...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2013-03, Vol.412, p.36-40
Main Authors: Liang, Zuoqiu, Zhang, Jinsu, Sun, Jiashi, Li, Xiangping, Cheng, Lihong, Zhong, Haiyang, Fu, Shaobo, Tian, Yue, Chen, Baojiu
Format: Article
Language:English
Subjects:
Afterglows
Condensed matter
Doping
Mathematical analysis
Phosphorescence
Phosphors
Quenching
Spectra
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Summary:Long lasting phosphors of CaSnO(3):Tb(3+) added alkali ions (Li(+), Na(+), K(+)) were prepared by solid-state reaction. The phosphorescence of samples consists of a group of green emission lines originating from (5)D(4) arrow right (7)F(J) transitions of Tb(3+). The afterglow spectra and concentration quenching behaviors of fluorescence were investigated in the Tb(3+) mono-doped sample. The result shows the optimal doping concentration of Tb(3+) is 0.3 mol%. In the co-doped samples, the doping concentrations of Tb(3+) and alkali ions are both at 0.3 mol%. It is found from the afterglow decay curves that the introduction of alkali ions can prolong the phosphorescent lasting time and the sample of incorporating Na(+) shows the best result. Tb(3+) and alkali ions can substitute Ca(2+) ions, acting as hole and electron traps, respectively. The thermoluminescence (TL) spectra are also investigated. The depths of traps for the mono- and co-doped samples are calculated to be 0.622, 0.541, 0.529 and 0.538 eV, respectively. Moreover, the possible mechanism of the green long lasting phosphorescence is proposed based on the experiment results.
ISSN:0921-4526
DOI:10.1016/j.physb.2012.12.013