The phosphors of Sm3+ activated KSr4(BO3)3 are synthesized through a solid state reaction. The site occupancy of Sm3+ in KSr4(BO3)3:Sm3+ was studied by Rietveld analysis of the X-ray powder diffraction patterns. Sm3+ ions are inclined to occupy 8c (Sr2) and 4a (Sr3) sites in the structure of KSr4(BO3)3 according to the refinement results. The luminescence properties of Sm3+ activated KSr4(BO3)3 have been investigated and strong reddish orange emitting color is found. The phenomenon of concentration quenching can be observed with the increasing of Sm3+ concentration. The nonradiative concentration quenching among two nearest Sm3+ centers occurs via electric multipolar interactions based on the Dexter theory. Fluorescence lifetime of KSr4(BO3)3:Sm3+ is 0.69, 0.74, 0.70, and 0.69 ms for the transition of 4G5/2 to 6HJ (J = 5/2, 7/2, 9/2, 11/2) respectively and the critical distance is 17.6 A.
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Wu et al. (2014) studied this question.
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