Tunable luminescence of SrLaMgTaO6:Sm3+ phosphors due to energy transfer from TaO6 group to Sm3+ ion

A series of SrLaMgTaO₆:Sm³⁺ phosphors were synthesized through a solid state reaction. The phase, microstructure and luminescent properties of the synthesized phosphors were investigated through techniques of XRD, SEM and spectrophotometer. The XRD patterns show that the synthesized phosphors have the same phase structure. The SEM images show that the synthesized phosphors are microcrystallines in the range of 1.2–3.4 µm. SrLaMgTaO₆:Sm³⁺ phosphors present emission bands originating from TaO₆ group and Sm³⁺ ions. The critical concentration of Sm³⁺ in SrLaMgTaO₆ is found to be 7 mol%. Due to energy transfer from TaO₆ group to Sm³⁺, tunable luminescence is obtained by changing Sm³⁺ doping concentration.