Synthesis and Photoluminescence Characterization of NaSr₄(BO₃)₃ Activated with Dy³⁺ Ion^*

Dy³⁺-doped NaSr₄(BO₃)₃ phosphors were prepared using the combustion method. The prepared phosphors were characterized by X-ray powder diffraction analysis. The excitation and emission spectra of the synthesized phosphors were analyzed with a fluorescence spectrometry. It is established that the NaSr₄(BO₃)₃:Dy³⁺ p hosphor emits blue (482 nm), yellow (575 nm), and red (666 nm) light under ultraviolet excitation of 352 nm. Finally, the photoluminescence properties of the synthesized phosphors with different Dy³⁺ doping concentrations were analyzed. The optimum concentration of the Dy³⁺ ion in NaSr₄(BO₃)₃ was found to be 0.0025 mole.