MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Inorg Chem. 2012 Aug 20;51(16):8802-9. doi: 10.1021/ic3006053. Epub 2012 Aug 8.
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.
采用高温固相反应法制备了一系列 Ca(3)La(3(1-x))Ce(3x)(BO(3))(5) 荧光粉。通过粉末 X 射线衍射（XRD）数据进行了 Rietveld 精修，结果表明 Ce(3+)占据了 Ca(2+)和 La(3+)位，优先占据 La(3+)位而不是 Ca(2+)位。Rietveld 分析表明，制备的样品中含有少量第二相 LaBO(3)，含量约为 0.64-3.27wt%。LaBO(3):1%Ce(3+) 被制备为单相材料，并确定了其激发和发射带，以确定杂质 LaBO(3):Ce(3+)发光对 Ca(3)La(3(1-x))Ce(3x)(BO(3))(5)样品光谱的影响。研究了 Ca(3)La(3(1-x))Ce(3x)(BO(3))(5)样品在真空紫外（VUV）和紫外激发下的发光性能，表现出 Ce(3+)的双中心发光，归因于 La(3+)位的 Ce(1)(3+)中心和 Ca(2+)位的 Ce(2)(3+)中心，考虑到光谱性质和 Rietveld 精修结果。讨论了掺杂浓度和激发波长对 Ca(3)La(3(1-x))Ce(3x)(BO(3))(5)中 Ce(3+)发光的影响以及衰减特性。
