Photoluminescence properties of Tb3+ and Ce3+ co-doped Sr2MgSi2O7 phosphors for solid-state lighting

Sr2MgSi2O7:Tb3+,Ce3+ phosphors were synthesized by solid-state reaction and placed in a muffle furnace in a reducing atmosphere at 1300 °C for 3 h. Photoluminescence properties and energy transfer were investigated. The Ce3+/Tb3+ energy transfer was thoroughly investigated by their emission/excitation spectra and photoluminescence lifetime, there was shortened lifetime of Ce3+ (from 51.31 to 50.06 ns) which could support evidence of energy transfer from Ce3+ to Tb3+ in the host. The varied emitted color of Sr1.97–yMgSi2O7:0.03Tb3+, yCe3+ phosphors could be achieved by altering the concentration of Ce3+, the chromaticity coordinates (x, y) varied from (0.225, 0.376) to (0.172, 0.231). In Sr1.96MgSi2O7:0.03Tb3+,0.01 Ce3+ phosphors, the results indicated that Sr2MgSi2O7:Tb3+,Ce3+ might be useful as tunable phosphors for ultraviolet white-light-emitting diodes.

Photoluminescence emission (λex=332 nm) spectra of Sr2–x–yMgSi2O7:xTb3+, yCe3+ (The inset shows the excitation and emission spectra of Sr1.99MgSi2O7:0.01Ce3+)Figure optionsDownload as PowerPoint slide