Luminescence properties of a single-host phosphor Ba1.8–wSrwLi0.4SiO4:Ce3+,Eu2+,Mn2+ for WLED

In order to obtain a single-host-white-light phosphor, a series of Ba1.8–w–x–y–zSrwLi0.4–xCexEuyMnzSiO4 (BSLS:Ce3+,Eu2+, Mn2+) powder samples were synthesized via high temperature solid-state reaction. The structure and photoluminescence properties were investigated. Under ultraviolet excitation, the emission spectra contained three bands: the 370–470 nm blue band, the 470–570 nm green band and the 570–700 nm red band, which arose from the 5d→4f transitions of Ce3+ and Eu2+, and the 4T1→6A1 transition of Mn2+, respectively. The excitation spectra of the emissions of Ce3+ and Mn2+ ions showed the energy transfer from Ce3+ to Mn2+. White light emission was obtained from the tri-doped samples of appropriate doping concentration under 310–360 nm excitation.