Luminescence properties of core-shell structured SiO2@CaMoO4:Eu3+ phosphor

Uniform SiO2@CaMoO4:Eu3+ red phosphor has been synthesized by sol-gel method, and its luminescence properties have been studied by fluorescence spectrometer. The structure and morphology of the SiO2@CaMoO4:Eu3+ red phosphor have been investigated by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and FT-IR spectrometer. Results indicate that phosphor particles have a core-shell structure and the thickness of the SiO2-shell is about 60 nm. In addition, the luminescent intensity of SiO2@CaMoO4:Eu3+ red phosphor has been greatly enhanced with respect to CaMoO4:Eu3+ phosphor. But the lifetime τ value of SiO2-coated CaMoO4:Eu3+ is slightly smaller than that of non-coated CaMoO4:Eu3+.

Graphical abstractA SiO2 nano-layer with thickness of 60 nm and good uniformity was successfully coated on the surface of CaMoO4:Eu3+ phosphor. This coating greatly increases luminescent intensity of the phosphor.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► SiO2@CaMoO4:Eu3+ was successfully synthesized by sol-gel method. ► The SiO2 nano-layer increases luminescent intensity of the phosphor. ► The SiO2 nano-layer reduces fluorescence lifetime of the phosphor.