Luminescence properties of a novel red phosphor 6LaPO₄ -3La₃ PO₇ -2La₇ P₃ O₁₈ :Eu³

Eu³⁺ -doped 6LaPO₄ -3La₃ PO₇ -2La₇ P₃ O₁₈ red luminescent phosphors were synthesized by co-deposition and high-temperature solid-state methods and its polyphase state was confirmed by X-ray diffraction analysis. Transmission electron microscopy showed the grain morphology as a mixture of rods and spheres. Luminescence properties of the phosphor were investigated and its red emission parameters were evaluated as a function of Eu³⁺ concentration (3.00-6.00 mol%). Excitation spectra of 6LaPO₄ -3La₃ PO₇ -2La₇ P₃ O₁₈ :Eu³⁺ showed strong absorption bands at 280, 395, and 466 nm, while the luminescence spectra exhibited prominent red emission peak centred at 615 nm (⁵ D₀ →⁷ F₂ ) in the red region. CIE chromaticity coordinates of the 6LaPO₄ -3La₃ PO₇ -2La₇ P₃ O₁₈ :5%Eu³⁺ phosphor were (0.668, 0.313) in the red region, and defined its potential application as a red phosphor.