Photoluminescence studies on LiNa5(PO4)2:Dy3+, Sm3+ phosphor

This paper describes the preparation, structure and photoluminescence properties of a new class LiNa5(PO4)(2):Dy3+, Sm3+-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 LiNa5(PO4)(2):Dy3+, Sm3+ phosphors. The result shows LiNa5(PO4)(2):Dy3+, Sm3+-phosphor excited by 374 nm nUV light produces pure white light than others. Admixing of 4f configurations and energy transfer between dopants are identified while varying the concentration of Sm3+. The CIE coordinates for LiNa5(PO4)(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 LiNa5(PO4)(2):Dy3+, Sm3+-phosphor suggests that it is useful for the fabrication of white light emitting diodes.