UV excitable Y2-x-y Gd (y) SiO5:Ce (x) phosphors for cool white light emission

Abstract

Cool white light was realized in Y2-x-y Gd (x) SiO5: Ce (y) phosphor under near UV excitation, due to the occupation Ce3+ in Y3+ 1st and 2nd site, synthesized using solid state carbothermal reduction route. SEM with elemental analysis show the existence of Gd in Y2SiO5:Ce enhances the particles size in comparison to Y2SiO5:Ce phosphors alone. Gd3+ (0.00a parts per thousand currency signxa parts per thousand currency sign0.75) and Ce3+ (0.02a parts per thousand currency signya parts per thousand currency sign0.10) concentration was optimized to 0.50 and 0.08 in Y2SiO5, respectively. The CIE chromaticity color coordinates (0.24, 0.20) are close to cool white light value which could be useful for the fabrication of cool white LED.