Photoluminescence of Eu2+-activated Na1-xAl1-xSi1+xO4 upon UV excitation

A convenient high temperature solid-state reaction method was developed to fabricate Na1-xAl1-xSi1+xO4:Eu2+ phosphors. The as-prepared products were characterized by X-ray diffraction (XRD), photoluminescence (PL), and photoluminescence excitation (PLE). The luminescence of Na1-xAl1-xSi1+xO4:Eu2+ phosphors were characterized by the two corresponding emission centers at 535 and 440 nm. The excitation spectrum extended from 250 to 400 nm. A white light was observed by naked eye upon ultraviolet excitation. The relative emissions intensities were also changed via introducing different amount of SiO2 and the doping concentration of europium, suggesting the possibility to adjust the emission of the material to white LED requisites.