Ceramics-Silikáty 66, (1) 78 - 84 (2022)

YAlO₃ and LaAlO₃ are both important oxides used as matrices in optical applications. Their mutual solid solubility is kinetically dependent, especially in a polycrystalline form. In this work, we prepared La_1-xY_xAlO₃ (x = 0-0.65) samples doped with 5 at% of Eu³⁺ in the A-site. The samples were prepared by Spark Plasma Sintering from powders synthetised by a reverse co-precipitation method. The single-phase samples were obtained up to a composition of La_0.7Y_0.25Eu_0.05AlO₃; with a higher yttrium doping level, a mixture of Y-rich and La-rich perovskite-type phases was present. The La/Y substitution had an influence on a shift in the top of the valence band which influenced the excitation spectra. In photoluminescence and radioluminescence measurements, the Eu³⁺ local site symmetry changes were manifested by the change in intensity and fine splitting of the ⁵D₀⟶⁷F_J (J = 1, 2, 3, 4, 5) emission bands. The increasing content of Y³⁺ caused a slight acceleration of the PL decay of the Eu³⁺ photoluminescence and an increase in the integral intensity of radioluminescence spectra.