The luminescent properties and crystal structure of Sr Mg SiO :xEu ,yCe blue phosphor synthesized by co-precipitation method.

In order to improve the luminescent performance of silicate blue phosphors, Sr Mg SiO :xEu ,yCe 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 (Eu ) can occupy two different types of sites (Sr and Sr ), the emission spectrum of Eu excited at 350 nm contains two single bands (EM and EM ) in the wavelength range 400-550 nm, centered at 463 nm, and the emission intensity first increases and then decreases with increasing concentrations of Eu ions. Co-doping of Ce ions can greatly enhance the emission intensity of Eu by transferring its excitation energy to Eu . Because of concentration quenching, a higher substitution concentration of Ce can lead to a decrease in the intensity. Meanwhile, the quantum efficiency of the phosphor is improved after doping with Ce , and a blue shift phenomenon is observed in the CIE chromaticity diagram. The results indicate that Sr Mg SiO :xEu ,yCe can be used as a potential new blue phosphor for white light-emitting diodes.