[en] Y_1-xAlO₃:Eu_x³⁺ and (Gd_yY_1-y)_0.93AlO₃:Eu_0.07³⁺ powder phosphors have been synthesized by co-precipitation. When the multi-component hybrid precursors are sintered at 1200 deg. C for 2 h non-agglomerative powder phosphors can be obtained with particle sizes ranging from 300 nm to 600 nm. Phosphor structure and morphology were examined by X-ray diffraction and field emission scanning electron microscopy. Luminescence spectra of these phosphors have been investigated in order to examine the Eu³⁺ doping concentration and the host matrix compositional effects on the photoluminescent behaviors. The emission spectra have a strong emission at about 614 nm corresponding to the electric dipole ⁵D₀ → ⁷F₂ transition of Eu³⁺ in all compounds. The optimum molar concentration for obtaining the highest PL intensity were x = 0.07 and y 0.7, respectively