Luminescent properties of Eu3+ and Sm3+ activated M2SiO4 (M=Ba, Sr and Ca) red-emitting phosphors for WLEDs

Eu3+ and Sm3+ activated M2SiO4 (M=Ba, Sr and Ca) red-emitting phosphors were synthesized by a solid state reaction. The results of XRD and SEM measurements show that the samples are single phase and have irregular shape. The excitation and emission spectra indicate that these phosphors were effectively excited by ultraviolet (395 nm) and blue (466 nm) light and exhibited red performance. The charge compensator R+ (R+=Li+, Na+ and K+) injecting into the host efficiently enhanced the luminescence intensity of the M2SiO4: Eu3+ and M2SiO4: Sm3+ phosphors. The emission intensity of M2SiO4: Eu3+ and Sm3+ doping Li+ were higher than that of Na+ or K+.