Luminescence properties YVO4 powders doped with dysprosium and alkaline-earth metals

Resumo

YVO₄:Dy and YVO₄:Dy,M (M = Mg, Ca, Sr, Ba) powders were prepared by sintering at 900°C. According to XRD patterns, all samples are well crystallized, single-phase YVO₄. SEM showed that the morphology of the samples did not show apparent changes. Under 275 nm excitation, the strongest emission line is observed at 576.6 nm, corresponding to the transition from ⁴F_9/2–⁶H_13/2 level of Dy³⁺ ion. The yellow/blue (Y/B) intensity ratio ⁴F_9/2–⁶H_13/2 to ⁴F_9/2–⁶H_15/2 values of Dy³⁺ for the phosphors doped with different divalent alkaline-earth metal ions is changes slightly. For the YVO₄:Dy³⁺ particles, this value is maximal, which indicates that the color of the with YVO₄:Dy³⁺ samples is the most pure.