Y 1−x AlO 3 :Eu x 3+ and (Gd y Y 1−y ) 0.93 AlO 3 :Eu 0.07 3+ powder phosphors have been synthesized by co-precipitation. When the multi-component hybrid precursors are sintered at 1200°C for 2h non-agglomerative powder phosphors can be obtained with particle sizes ranging from 300nm to 600nm. 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 Eu 3+ doping concentration and the host matrix compositional effects on the photoluminescent behaviors. The emission spectra have a strong emission at about 614nm corresponding to the electric dipole 5 D 0 → 7 F 2 transition of Eu 3+ in all compounds. The optimum molar concentration for obtaining the highest PL intensity were x=0.07 and y=0.7, respectively.