Fabrication and luminescence properties of Dy3+ doped CaMoO4 powders

Dy3+ doped CaMoO4 powders (CaMoO4:Dyx3+) have been fabricated via solid-state ceramic method; the microstructures and room temperature photoluminescence properties of the as-fabricated microcrystallines were investigated by through X-ray diffraction (XRD), scanning electron micrograph (SEM), Fourier transform infrared spectroscopy (FT-IR) and fluorescence analysis (FA); and the effect of the doping of Dy3+ ions on the microstructures and luminescence properties of the CaMoO4:Dyx3+ phosphors were also investigated. Our results reveal that the obtained CaMoO4:Dyx3+ phosphor powders are single-phase scheelite structure with tetragonal symmetry. The doping of Dy3+ ion inhibits the grain growth, decreases the intrinsic emission of MoO42− complex ions. With regard to CaMoO4:Dyx3+ phosphors, a bright fluorescent yellow emission at 574 nm (4F9/2 → 6H13/2) and blue emission at 487 nm (4F9/2 → 6H15/2) have been observed. The decay time of the two emission spectra (487 nm and 574 nm) of Dy3+ ion both decrease with increasing Dy3+ concentration.