Preparation and Luminescence Properties of Red Phosphors Ca3Y2Si3O12:Eu3+

Red phosphors Ca3Y2Si3O12:Eu3+ were synthesized by a high temperature solid-state method. The effects of Eu3+ ion doping concentration, flux and Gd3+ co-doping on the luminescence properties of phosphors were studied. XRD analysis shows that the principal crystalline phase is Ca3Y2Si3O12, attributed to monoclinic system. Fluorescence spectroscopy reveals that the emission spectrum of silicate phosphor Ca3Y2Si3O12:Eu3+ consists of two main emission peaks, located at 590 nm (D-5(0) -> F-7(1)) and 614 nm (D-5(0) -> F-7(2)). Monitored with the strongest peak of 614 nm, excitation spectrum was obtained which ranged from 200 to 500 nm. The results indicate that the emission intensity of the phosphors firstly increases and then decreases with the increasing of the doping concentration of Eu3+ ion. It is found that the optimum doping concentration of Eu3+ ion is 20 mol%. In addition, the phosphor emission intensity decreases by adding a certain amount H3BO3, but increases significantly by adding NH4F. However, there is little effect of NaCl or CaF2 on the phosphor emission intensity. Gd3+ ion could act as a good co-activator, improving the emission intensity of Eu3+ ion.