Article ID Journal Published Year Pages File Type
1485162 Journal of Non-Crystalline Solids 2007 6 Pages PDF
Abstract
Silica xerogel doped with Ln2−xSmx(WO4)3, where Ln = Gd(III) or La(III), were prepared by the sol-gel procedure. The parameter x in the formula was changed in the 0.02-2.0 range. Absorption and photoluminescence of a new kind of red light phosphors with emitting Sm3+ ions were studied at room temperature. In this type of luminescent material, prepared by the sol-gel method, samarium(III) ions exhibit enhanced luminescence emission owing to excitation energy transfer from WO42- groups to Sm3+ ions in the Ln2−xSmx(WO4)3 salt. The enhancement is particularly large for Gd2−xSmx(WO4)3, where x = 0.1, and La2−xSmx(WO4)3, x = 0.2, compounds entrapped in a silica xerogel. However, the La-Sm system exhibits higher emission intensity than the Gd-Sm material. The emission intensity of both the materials was additionally improved by removing O-H oscillators by the thermal treatment.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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