Study on relationship of luminescence in CaS:Eu,Sm and dopants concentration |
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Authors: | Jianping Wu David NewmanIan VF Viney |
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Institution: | Centre for Data Storage Materials, Coventry University, Coventry CV1 5FB, UK |
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Abstract: | In order to study different characteristic luminescence of Eu2+ and Sm3+, delayed photoluminescence (DPL) and infrared stimulated luminescence (ISL) spectra of CaS doped with europium and samarium have been investigated. The influence of Eu and Sm concentration on luminescence of Eu2+ in photoluminescence (PL) and ISL was respectively studied. It was found that, at low doping levels, PL emission intensity of Eu2+ increased linearly with increment of Eu, while decreased linearly with increment of Sm. However, further increment of Eu and Sm in CaS:Eu,Sm could not increase either the luminescent centres of Eu2+ or electron trapping sites of Sm3+. Different local environment of Eu2+ and Sm3+ in the lattice position is thought to be the cause of all observed luminescence phenomena. Finally, the maximum emission in ISL was obtained at 1000 ppm europium and 750 ppm samarium. |
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Keywords: | Europium ion Samarium ion |
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