title: The luminescent properties and crystal structure of Sr(1.5-x)-(1.5y)Mg0.5SiO4:xEu2+,yCe3+blue phosphor synthesized by co-precipitation method.
abstract: In order to improve the luminescent performance of silicate blue phosphors, Sr(1.5-x)-(1.5y)Mg0.5SiO4: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 (Sr1and Sr2), the emission spectrum of Eu2+excited at 350 nm contains two single bands (EM1and 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)Mg0.5SiO4:xEu2+,yCe3+can be used as a potential new blue phosphor for white light-emitting diodes.
authors.affiliation: College of Material Science & Engineering, Sichuan University, Chengdu, China.
authors.forename: Jin Shan
authors.initials: JS
authors.lastname: Wang
authors.affiliation: College of Material Science & Engineering, Sichuan University, Chengdu, China.
authors.forename: Da-Chuan
authors.initials: DC
authors.lastname: Zhu
authors.affiliation: Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Yongchuan, China.
authors.forename: Cong
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Research Institute for New Materials Technology, Chongqing University of Arts and Sciences, Yongchuan, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Han
authors.affiliation: College of Material Science & Engineering, Sichuan University, Chengdu, China.
authors.forename: ShaSha
authors.initials: S
authors.lastname: Liu
mesh_terms: D002563:Cerium / Q000737:chemistry; D011232:Chemical Precipitation; D003460:Crystallization; D005063:Europium / Q000737:chemistry*; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008163:Luminescent Measurements; D008277:Magnesium Oxide / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013324:Strontium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D049408:Luminescent Agents; D017640:Silicates; D002563:Cerium; D008277:Magnesium Oxide; D005063:Europium; D013324:Strontium
keywords: Sr(1.5-x)-(1.5y)MgSiO4:xEu2+,yCe3+; concentration quenching; emission intensity; energy transfer