A series of K2MgSi3O8:xCe3+ (x = 0.01–0.09), K2MgSi3O8:0.05Ce3+, yTb3+ (y = 0–0.09) phosphors was prepared by solid-state method. X-ray diffraction was used to determine the crystal phase. Luminescence properties were characterized by photoluminescence (PL), photoluminescence excitation (PLE) spectra at room temperature. K2MgSi3O8:xCe3+ series emits blue light when excited by UV-light (λex = 350 nm). Nonequivalent substitution of K+ for Ce3+ leads to the multiple Ce3+ centers in the compound. K2MgSi3O8:Ce3+, Tb3+ exhibits broad band emission...