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.

Graphical AbstractCIE chromaticity coordinate points of the samples Ba1.245 Sr0.4Li0.3Ce0.10Eu0.005Mn0.05SiO4 (sample 1) and Ba1.243Sr0.4Li0.3Ce0.10Eu0.007Mn0. 05SiO4 (sample 2) under various excitation wavelengths increasing from 310 to 370 nm along the direction of the arrowFigure optionsDownload full-size imageDownload as PowerPoint slide