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8481790 
Journal Article 
Refinement and luminescent properties of BaWO4: xSm(3)(+) yellow phosphor by a low temperature molten salt method 
Shi, Y; Shi, J; Dong, C; , 
2018 
1 
Optical Materials
ISSN: 0925-3467 
ELSEVIER SCIENCE BV 
AMSTERDAM 
396-403 
WOS:000446145200061 
In order to study the structure and analyze the performance, a series of BaWO4 with different Sm3+ -doped concentration crystal particles were synthesized successfully via a low temperature molten salt method in LiNO3-KNO3 molten salt systems. For structural characterization, the phase and morphology of as-prepared powders were detected by XRD and SEM. It was clear that octahedron-type particles confirmed the scheelite-type tetragonal structure with space group I4(1)/a. The effect of different contents of Sm3+ on the BaWO4 crystal structure was studied by Rietveld refinement techniques and the change of the optical band gap. As for the luminescent properties, the Sm3+ doped phosphors under 403 nm (H-6(5/2)-F-4(7/2)) excitation, exhibited characteristic luminescent of (4)G(5)(/2)-H-6(5/2), H-6(7/2), H-6(9/2) transition of the Sm3+ ion. It was found that the optimal concentration involved in luminescence was about 3mol%. The critical distance between the Sm3+ ions was 1.852 nm. The mainly dominant mechanism of concentration quenching and corresponding CIE color coordinate were elaborated in details. These results indicated as-prepared phosphors could be suitable as single-doped yellow light emitters with only single-phased for solid state lighting applications.