Synthesis and Fluorescence Properties of Europium-Lanthanum-Calcium Orthophosphates and Condensed Phosphates ()
ABSTRACT
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.
Share and Cite:
Onoda, H. and Funamoto, T. (2012) Synthesis and Fluorescence Properties of Europium-Lanthanum-Calcium Orthophosphates and Condensed Phosphates.
Advances in Materials Physics and Chemistry,
2, 208-211. doi:
10.4236/ampc.2012.24031.