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This paper describes the preparation, structure and photoluminescence properties of a new class LiNa 5 (PO 4 ) 2 :Dy 3+ , Sm 3+ -phosphor. Crystalline nature confirmed by X-ray diffraction. The phases obtained are in good agreement with the standard phase. Excitation dependence and concentration effect on luminescence features are investigated. Color purity and optical bandgap are also estimated for the LiNa 5 (PO 4 ) 2 :Dy 3+ , Sm 3+  phosphors. The result shows LiNa 5 (PO 4 ) 2 :Dy 3+ , Sm 3+ -phosphor excited by 374 nm nUV light produces pure white light than others. Admixing of 4 f  configurations and energy transfer between dopants are identified while varying the concentration of Sm 3+ . The CIE coordinates for LiNa 5 (PO 4 ) 2 :0.05Dy 3+ , 0.05Sm 3+  ( x  = 0.309,  y  = 0.332) are positioned well in white light region and very close to pure white light. The present study on LiNa 5 (PO 4 ) 2 :Dy 3+ , Sm 3+ -phosphor suggests that it is useful for the fabrication of white light emitting diodes.

Photoluminescence studies on LiNa 5 (PO 4 ) 2 :Dy 3+ , Sm 3+ phosphor