title: Structure refinement and two-center luminescence of Ca3La3(BO3)5:Ce3+ under VUV-UV excitation.
abstract: A series of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) phosphors were prepared by a high-temperature solid-state reaction technique. Rietveld refinement was performed using the powder X-ray diffraction (XRD) data, which shows occupation of Ce(3+) on both Ca(2+) and La(3+) sites with a preferred location on the La(3+) site over the Ca(2+) site. The prepared samples contain minor second phase LaBO(3) with contents of ~0.64-3.27 wt % from the Rietveld analysis. LaBO(3):1%Ce(3+) was prepared as a single phase material and its excitation and emission bands were determined for identifying the influence of impurity LaBO(3):Ce(3+) luminescence on the spectra of the Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) samples. The luminescence properties of Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) samples under vacuum ultraviolet (VUV) and UV excitation were investigated, which exhibited two-center luminescence of Ce(3+), assigned to the Ce(1)(3+) center in the La(3+) site and Ce(2)(3+) center in the Ca(2+) site, taking into account the spectroscopic properties and the Rietveld refinement results. The influences of the doping concentration and the excitation wavelength on the luminescence of Ce(3+) in Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) are discussed together with the decay characteristics.
authors.affiliation: MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.
authors.forename: Chunmeng
authors.initials: C
authors.lastname: Liu
authors.forename: Hongbin
authors.initials: H
authors.lastname: Liang
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Kuang
authors.forename: Jiuping
authors.initials: J
authors.lastname: Zhong
authors.forename: Shuaishuai
authors.initials: S
authors.lastname: Sun
authors.forename: Ye
authors.initials: Y
authors.lastname: Tao
mesh_terms: D001895:Boron / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D002563:Cerium / Q000737:chemistry*; D007811:Lanthanum / Q000737:chemistry*; D049449:Luminescence; D008163:Luminescent Measurements; D015335:Molecular Probes / Q000138:chemical synthesis*; D015394:Molecular Structure; D013057:Spectrum Analysis; D014466:Ultraviolet Rays; D014618:Vacuum; D014961:X-Ray Diffraction
chemical_list: D015335:Molecular Probes; D002563:Cerium; D007811:Lanthanum; D001895:Boron; D002118:Calcium