Structure Refinement and Two-Center Luminescence of Ca3La3(BO3)5:Ce3+ under VUV鈥揢V Excitation

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• 作者：Chunmeng Liu ; Hongbin Liang ; Xiaojun Kuang ; Jiuping Zhong ; Shuaishuai Sun ; Ye Tao
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：August 20, 2012
• 年：2012
• 卷：51
• 期：16
• 页码：8802-8809
• 全文大小：487K
• 年卷期：v.51,no.16(August 20, 2012)
• ISSN：1520-510X

文摘

A series of Ca₃La_3(1鈥?i>x)Ce_3x(BO₃)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 Ce³⁺ on both Ca²⁺ and La³⁺ sites with a preferred location on the La³⁺ site over the Ca²⁺ site. The prepared samples contain minor second phase LaBO₃ with contents of 0.64鈥?.27 wt % from the Rietveld analysis. LaBO₃:1%Ce³⁺ was prepared as a single phase material and its excitation and emission bands were determined for identifying the influence of impurity LaBO₃:Ce³⁺ luminescence on the spectra of the Ca₃La_3(1鈥?i>x)Ce_3x(BO₃)₅ samples. The luminescence properties of Ca₃La_3(1鈥?i>x)Ce_3x(BO₃)₅ samples under vacuum ultraviolet (VUV) and UV excitation were investigated, which exhibited two-center luminescence of Ce³⁺, assigned to the Ce(1)³⁺ center in the La³⁺ site and Ce(2)³⁺ center in the Ca²⁺ 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 Ce³⁺ in Ca₃La_3(1鈥?i>x)Ce_3x(BO₃)₅ are discussed together with the decay characteristics.