Synthesis and Characterization of a KSrGd(MoO₄)₃:Er³⁺/Yb³⁺ Upconversion Phosphor

A ternary molybdate with the composition KSrGd(MoO₄)₃ and a monoclinic scheelite-like structure has been synthesized. Codoping KSrGd(MoO₄)₃ with Er³⁺/Yb³⁺ ions, we have obtained an upconversion phosphor exhibiting anti-Stokes luminescence in the range 400–700 nm under IR excitation. The synthesized phosphor has been characterized by X-ray diffraction, differential thermal analysis, and vibrational spectroscopy, and its luminescence spectra have been measured.