The luminescent properties and crystal structure of Sr (1.5-x)-(1.5y) Mg 0.5 SiO 4 :xEu 2+ ,yCe 3+ blue phosphor synthesized by co-precipitation method.

In order to improve the luminescent performance of silicate blue phosphors, Sr(1.5-x)-(1.5y) Mg0.5 SiO4 :xEu2 + ,yCe3+ phosphors were synthesized using one-step calcination of a precursor prepared by chemical co-precipitation. The crystal structure and luminescent properties of the phosphors were analyzed using X-ray diffraction and fluorescence spectrophotometry, respectively. Because the activated ions (Eu2+ ) can occupy two different types of sites (Sr1 and Sr2 ), the emission spectrum of Eu2 + excited at 350 nm contains two single bands (EM1 and EM2 ) in the wavelength range 400-550 nm, centered at 463 nm, and the emission intensity first increases and then decreases with increasing concentrations of Eu2 + ions. Co-doping of Ce3 + ions can greatly enhance the emission intensity of Eu2 + by transferring its excitation energy to Eu2 + . Because of concentration quenching, a higher substitution concentration of Ce3 + can lead to a decrease in the intensity. Meanwhile, the quantum efficiency of the phosphor is improved after doping with Ce3 + , and a blue shift phenomenon is observed in the CIE chromaticity diagram. The results indicate that Sr(1.5-x)-(1.5y) Mg0.5 SiO4 :xEu2+ ,yCe3+ can be used as a potential new blue phosphor for white light-emitting diodes.