Upconversion luminescence and Judd-Ofelt analysis of Er3+ doped NaSrVO4 inorganic phosphor

The development of nano-phosphors containing upconverting luminescent materials has demonstrated their potential applications in photovoltaics. In this context, this article explores the upconversion capabilities of NaSrVO4 phosphor when activated by Er3+ ions. The NaSr(1-x)VO4:xEr3+ (0.01 <= x <= 0.04) phosphors were synthesized using a facile combustion method with urea as the fuel. Phase purity, investigated through powder X-ray diffraction, confirms the formation of a single-phase (monoclinic) material with a P21/n space group. The morphological and elemental composition of the phosphor were analyzed using transmission electron microscopy and X-ray photoelectron spectroscopy. The dopant, erbium, was found to be in the + 3 oxidation state. The direct bandgap of the synthesized phosphor is 3.69 eV for the doped sample. Upconversion photoluminescence was systematically studied, and the impact of dopant (Er3+) concentration on luminescent properties was extensively analyzed. The emission color of the synthesized phosphor falls within the green region of the spectrum and exhibits good color purity. Overall, the results suggest the potential application of the synthesized phosphor in the field of optoelectronic materials.