Preparation and Optical Properties of La₃PO₇:Eu³⁺ Nanophosphors Synthesized by Combustion Method

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Eu³⁺ doped La₃PO₇ nanoparticles were successfully synthesized under facial combustion method. The nano-phosphors then were characterized by some techniques including X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), photoluminescence spectrum (PL), and lifetime decay. SEM and TEM micrographs reveal exhibit of the La₃PO₇: Eu³⁺ nanopowders in spherical morphology with an average size of about 20 nm, matching with Scherrer’s formula calculation. Otherwise, the influence of annealing temperature and concentration of Eu³⁺ ions on optical characteristics of Eu³⁺ was doped La₃PO₇, and optical properties were investigated too. The photoluminescence shows the strong red emission originating from the ⁵D₀ → ⁷F_J (J = 1, 2, 3, and 4) transitions of Eu3+ and the 614 nm emission from the ⁵D₀ → ⁷F₂ electronic dipole transition is dominant.