LAUSR

In this research, Ce 3+ and Tb 3+ doped alkaline-earth silicate Sr 2 MgSi 2 O 7 phosphors have been synthesized by solid-state reaction. The results show that the Sr 2− x MgSi 2 O 7 : x Ce 3+ phosphors exhibit a violet–blue emission with excitation at 348 nm, whereas the Sr 2− y MgSi 2 O 7 : y Tb 3+ phosphor show a green emission with excitation at 243 nm. In addition, the structure of Sr 2 MgSi 2 O 7 host has been analyzed by Crystalmaker program. Staggered arrangements of [SiO 4 ] and [MgO 4 ] units in the Sr 2 MgSi 2 O 7 system underlie possible chemical tuning and phase segregation, providing a potential candidate of tunable luminescence. A red shift of wave length is clarified by crystal field theory and Van Uitert expression. The FESEM image of Sr 1.99 MgSi 2 O 7 :0.01Ce 3+ phosphors reveal that it has a proper particle size for application in WLEDs. With different Tb 3+ doping concentration, the CIE chromaticity coordinates Sr 2 MgSi 2 O 7 :Tb 3+ phosphors still remain a steady position. These results indicate that Sr 2− x MgSi 2 O 7 : x Ce 3+ , Sr 2− y MgSi 2 O 7 : y Tb 3+ phosphors are promising phosphors for WLEDs.