Photoluminescence properties of Ce 3+, Mn 2+ co-doped Sr 2LiSiO 4F phosphor

Abstract

Sr 2LiSiO 4F co-doped with Ce 3+, Mn 2+ have been synthesized by means of solid state reactions. Their photoluminescence (PL) emission spectra, excitation spectra and the decay profiles of Ce 3+ emission have been measured at room temperature. The emission peak around 410 nm is ascribed to the 5d 1 to 2F 5/2 and 2F 7/2 transitions of Ce 3+ ions, while the peak around 680 nm is ascribed to the 4T 1– 6A 1 transition of Mn 2+ ions. The decay rate of the 5d state within Ce 3+ ion under 355 nm laser excitation becomes faster with the increase of Mn 2+ concentration. The analysis of the observed spectra confirms that there exists energy transfer from Ce 3+ to Mn 2+.