Enhanced emission from Li_2CaSiO_4:Eu~(2+) phosphors by doping with Y~(3+)

摘要

Y~(3+) doped Li_2CaSiO_4:Eu~(2+) phosphors were synthesized by the solid state reaction method. Lager increases in the emission have been achieved by doping Y~(3+) in the host. Upon 375 nm excitation, the present synthesized phosphors have higher emission intensity than that of the commercial blue phosphor, BaMgAl_(10). O_(17):Eu~(2+). The doping effects of Y~(3+) were discussed systematically based on the analysis of structure, morphology, element, and spectroscopic properties. XRD patterns and EDS spectrum revealed that the samples maintained Li_2CaSiO_4 phase after doping Eu~(2+) and Y~(3+). SEM images showed the morphology and particle size of all phosphors were similar. DRS showed doping Y~(3+) could enhance the absorption of Li_2CaSiO_4:Eu~(2+). Finally, the enhancement mechanism was studied in detail. It was also observed that the emission of Li_2CaSiO_4:Eu~(2+) could also be enhanced by doping other rare earth ions RE~(3+) (RE = Dy, Er, Sm, Tm, Tb, and Yb), which could confirm the mechanism. These results provided a useful basis for further improving the luminescence performance of silicate phosphors.