Synthesis and Fluorescence Properties of Europium-Substituted Lanthanum Orthophosphate and Condensed Phosphates

Abstract

Mixtures of lanthanum oxide, europium oxide, and phosphoric acid were heated with various ratios of P/(La + Eu) and Eu/(La + Eu). The obtained phosphates were estimated using XRD patterns, FT-IR spectra, and SEM images. The fluorescence spectra and resistance against hydrofluoric acid were estimated as functional properties of these phosphate materials. The condensed phosphates showed a strong peak at 615 nm and high resistance against hydrofluoric acid.

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

“…[6,7]. The condensed phosphates have different properties from those of orthophosphates and can therefore be used as novel functional materials [8,9].…”

Synthesis and Fluorescence Properties of Europium - Substituted Lanthanum Polyphosphates

“…All samples had no specified shape in spite of the europium ratio and heating temperatures. In previous work, the particles had a plane at samples synthesized by heating (Onoda & Funamoto, 2012). The europium-substituted lanthanum polyphosphate had different particle shape from the synthetic methods.…”

“…2, No. 1;2013 europium (Onoda & Funamoto, 2012). The optimum europium ratio was different with the synthetic process of lanthanum polyphosphate.…”

“…Especially, the addition of europium indicated strong fluorescence in materials of various kinds (Bettinelli et al, 2012). In previous work, the europium-substituted lanthanum condensed phosphates were synthesized from lanthanum oxide, europium oxides, and phosphoric acid (Onoda & Funamoto, 2012). The europium-substituted lanthanum polyphosphate and ultraphosphate were more suitable materials than orthophosphate for red luminescence.…”

“…Therefore, in this work, lanthanum polyphosphates were studied as a host material. In the previous work (Onoda & Funamoto, 2012), lanthanum polyphosphates were synthesized by solid state reaction. The major synthetic processes of lanthanum polyphosphate were the folling methods.…”