Influence of Zn2+ and Si4+ codoping on luminescence properties of CaWO4:Eu3+ phosphor

The red afterglow phosphors of CaWO4 doped with Eu3+, Zn2+ or (and) Si4+ were prepared by solid state reaction. All crystalline phases were identified by the X-ray powder diffraction (XRD). The photoluminescence spectra and decay curves as well as thermoluminecence (TL) curves of all samples were also investigated. In comparison to CaWO4:Eu3+ phosphor, the luminescence and afterglow properties could be improved greatly after being doped with Zn2+ or (and) Si4+ ions.

Emission spectra (λex = 254 nm) of Ca0.99WO4:Eu0.013+, Ca0.98WO4:Eu0.013+,Zn0.012+, Ca0.98WO4:Eu0.013+, Si0.012+ and Ca0.97WO4:Eu0.013+, Zn0.012+, Si0.012+ samples.Figure optionsDownload as PowerPoint slideHighlights
► Co-doping Zn2+ and Si4+ ions in CaWO4: Eu3+ could enhance the intensity of the charge band of WO42−.
► Co-doping Zn2+ and Si4+ ions in CaWO4:Eu3+ could make the energy transfer from WO42− to Eu3+ more efficiently.
► Co-doping Zn2+ and Si4 in CaWO4:Eu3++ is beneficial for the improvement the afterglow property.