Eu-doped La.sub.1-x./sub.Y.sub.x./sub.AlO.sub.3./sub.: impact of Y/La ratio on optical properties

0553434 - FZÚ 2023 RIV CZ eng J - Journal Article
Havlíček, J. - Rubešová, K. - Jakeš, V. - Cajzl, J. - Průša, F. - Kučerková, Romana - Nikl, Martin
Eu-doped La_1-xY_xAlO₃: impact of Y/La ratio on optical properties.
Ceramics - Silikáty. Roč. 66, č. 1 (2022), s. 78-84. ISSN 0862-5468. E-ISSN 1804-5847
R&D Projects: GA MV VI20192022152
Institutional support: RVO:68378271
Keywords : perovskites * ceramics * optical materials * luminescence * spark plasma sintering
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.9, year: 2022
Method of publishing: Open access

YAlO3 and LaAlO3 are both oxides used as matrices in optical applications. Their mutual solid solubility is kinetically dependent, especially in a polycrystalline form. 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. 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.
Permanent Link: http://hdl.handle.net/11104/0330678