Photoluminescence properties of Ce3+, Mn2+ co-doped Sr2LiSiO4F phosphor

Sr2LiSiO4F co-doped with Ce3+, Mn2+ have been synthesized by means of solid state reactions. Their photoluminescence (PL) emission spectra, excitation spectra and the decay profiles of Ce3+ emission have been measured at room temperature. The emission peak around 410 nm is ascribed to the 5d1 to 2F5/2 and 2F7/2 transitions of Ce3+ ions, while the peak around 680 nm is ascribed to the 4T1-6A1 transition of Mn2+ ions. The decay rate of the 5d state within Ce3+ ion under 355 nm laser excitation becomes faster with the increase of Mn2+ concentration. The analysis of the observed spectra confirms that there exists energy transfer from Ce3+ to Mn2+.