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Abstract
The series of divalent samarium substituted strontium tetraborate (Sr 1− x Sm x B 4O 7) polycrystalline samples were prepared by the conventional solid-state reaction. The phase formation of the samples was investigated by X-ray powder diffraction measurements. The luminescence spectra and decay curves of the Sm 2+ ions were measured. Temperature dependent Sm 2+ luminescence properties were investigated. The f–d and 5D 1– 7F J transitions appeared at 350 K and increased with increase in the temperature while the intensity of 5D 0– 7F J transitions decreased. The emission spectra pointed out that Sm 2+ occupies of C 2v or lower symmetry site. The photoluminescence decay times of strontium tetraborate doped with different concentrations of Sm 2+ was investigated as a function of temperature in the range of 100–500 K. However, no obvious concentration quenching was observed.
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