ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

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

Havlíček Jan 1, Rubešová Kateřina 1, Jakeš Vít 1, Cajzl Jakub 1,, Průša Filip 2, Kučerková Romana 3,Nikl Martin 3
1 Department of Inorganic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6, 166 28, Czech Republic
2 Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Technická 5, Prague 6, 166 28, Czech Republic
3 Institute of Physics of the Czech Academy of Sciences, Cukrovarnická 10, 16200 Prague, Czech Republic

Keywords: Perovskite, Ceramics, Optical materials, Luminescence, Spark plasma sintering

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 La1-xYxAlO₃ (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 La0.7Y0.25Eu0.05AlO₃; 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⟶⁷FJ (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.

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doi: 10.13168/cs.2022.0002
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