Synthesis and Fluorescence Properties of Europium - Substituted Lanthanum Polyphosphates

Europium-substituted lanthanum polyphosphates (Eu; 0, 1, 2, 3, 4, 5, and 10 mol%) were prepared from lanthanum nitrate, europium nitrate, and sodium polyphosphate solutions. The obtained phosphates were estimated using XRD patterns, TG-DTA curves, SEM images, and particle size distributions. The fluorescence spectra were estimated as functional properties of these phosphate materials. The obtained samples crystallized by heating at 600oC. Lanthanum polyphosphates were stable from 600 to 850oC. The 5 mol% europium-substituted lanthanum polyphosphate showed a strong peak at 615 nm.