Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5399044 | Journal of Luminescence | 2016 | 6 Pages |
Abstract
Sm3+:NaGd(WO4)2 sub-micron phosphors were synthesized by a sol-gel method. The tetragonal crystalline structure was observed from X-ray diffraction analysis and the crystallite size was calculated by Williamson-Hall approximation. Raman results elucidate the presence of phonon vibrations corresponding to tungstate tetrahedra and free metallic ions. The morphology and average grain size were obtained using scanning electron microscopy. Luminescence spectra reveal the emission peaks at 563Â nm (4G5/2â6H5/2), 600Â nm (4G5/2â6H7/2), 645Â nm (4G5/2â6H9/2) and 700Â nm (4G5/2â6H11/2) under the excitation wavelength of 406Â nm. The maximum emission intensity was observed for 3Â mol% of Sm3+ ions concentration in NaGd(WO4)2 phosphors. The temperature dependent luminescence and luminescence decay were measured. The CIE color co-ordinates of 3Â mol% Sm3+:NaGd(WO4)2 phosphors were calculated as (0.558, 0.416).
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Authors
A. Durairajan, D. Balaji, K. Kavi Rasu, S. Moorthy Babu, M.A. Valente, D. Thangaraju, Y. Hayakawa,