Synthesis and Fluorescence Properties of Europium-Lanthanum-Calcium Orthophosphates and Condensed Phosphates


Mixtures of lanthanum oxide, europium oxide, calcium carbonate, and phosphoric acid were heated with various ratios of P/(Eu + La + Ca) and La/Ca. Europium ratio was settled at Eu/(Eu + La + Ca) = 0.03. The obtained phosphates were estimated using X-ray diffraction (XRD) patterns, Fourier transform infrared spectroscopy (FT-IR) spectra, and scanning electron micrograph (SEM) images. The fluorescence spectra and resistance against hydrofluoric acid were estimated as functional properties of these phosphate materials. The mixture of lanthanum and calcium phosphates were formed from XRD patterns and IR spectra. Samples prepared in P/(Eu + La + Ca) = 2 and 3 had large particles in SEM images. The condensed phosphates showed a strong peak at 615 nm and high resistance against hydrofluoric acid.

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H. Onoda and T. Funamoto, "Synthesis and Fluorescence Properties of Europium-Lanthanum-Calcium Orthophosphates and Condensed Phosphates," Advances in Materials Physics and Chemistry, Vol. 2 No. 4, 2012, pp. 208-211. doi: 10.4236/ampc.2012.24031.

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The authors declare no conflicts of interest.


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