| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1489863 | Materials Research Bulletin | 2013 | 5 Pages |
The Na+-free and Na+ co-doped Ca9Gd(VO4)7:Eu3+, Dy3+ phosphors have been synthesized by the conventional solid-state reaction. For the Na+-free Ca9Gd(VO4)7:Eu3+, Dy3+ phosphors, the emission spectra at λex = 300 nm exhibit red, yellow and blue emission due to f–f transitions of Dy3+ and Eu3+, and the emission intensity can be tuned by the concentration of Dy3+ and Eu3+. For the Na+ co-doped Ca9Gd(VO4)7:Eu3+, Dy3+ phosphors, all the emission intensity of red, yellow and blue increases with the Na+ concentration, and the origin for the enhanced emission can be assigned to the variation of crystal field surrounding the Eu3+ and Dy3+ activator which results from the oxygen vacancy created by substituting Na+ for Ca2+.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The phosphors for white light emitting diode. ► Tri-color emission of Ca9Gd(VO4)7:Eu3+, Dy3+. ► The emission enhancement by doping Na+ into Ca9Gd(VO4)7:Eu3+, Dy3+.
