[en] Strontium magnesium borate glass co-doped dysprosium and samarium ions of various concentrations have been successfully synthesized following conventional melt quenching technique and characterized by XRD, Ftir, UV-Vis and Pl to understand their luminescence behaviour. XRD spectrum confirmed the amorphous state of the glass. The presence of local structure was revealed by Ftir spectroscopy. The Pl emission spectra identified combined emission spectra belonging to both Dy³⁺ and Sm³⁺. The optimized 0.7 mol % of Dy³⁺ is co-doped with Sm (varied contents) to examine the sensitization effect of Sm³⁺ on Dy³⁺ luminescence. The results disclosed that with the addition of Sm³⁺ to Dy³⁺ doped strontium magnesium borate glass, the emission intensity of Sm³⁺ increased linearly up to 0.4 mol % and quenches thereafter. It was observed that the Sm³⁺ ion have strongly enhanced the emission intensity of Dy³⁺ in the co-doped strontium magnesium borate glass due to cross-relaxation process through the excitation energy transfer mechanism of Sm³⁺. (author)