Preparation and luminescence characterization of Cu-doped lithium aluminate ceramics within the Li2O-Al2O3 system

0560199 - ÚFP 2023 RIV US eng J - Článek v odborném periodiku
Thoř, Tomáš - Rubešová, K. - Jakeš, V. - Kučerková, Romana - Nikl, Martin
Preparation and luminescence characterization of Cu-doped lithium aluminate ceramics within the Li2O-Al2O3 system.
Journal of Sol-Gel Science and Technology. Roč. 103, č. 3 (2022), s. 898-907. ISSN 0928-0707. E-ISSN 1573-4846
Grant CEP: GA MV VI20192022152; GA MŠMT(CZ) EF16_026/0008390
Institucionální podpora: RVO:61389021 ; RVO:68378271
Klíčová slova: Copper doping * Lithium aluminate * Luminescence * Scintillation * Sol–gel
Obor OECD: Materials engineering; Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impakt faktor: 2.5, rok: 2022
Způsob publikování: Omezený přístup
https://link.springer.com/article/10.1007/s10971-022-05905-x

Cu+-doped lithium aluminates with LiAlO2, LiAl5O8, and Li5AlO4 stoichiometry were investigated. Tetragonal γ-LiAlO2 and cubic α-LiAl5O8 were prepared in the form of bulk ceramics using the Pechini sol–gel route with Cu-doping concentrations up to 1 mol%. For γ-LiAlO2, single-phase samples were obtained only for the lowest doping concentration tested, which was 0.1 mol%, while α-LiAl5O8 samples were single phase within the full concentration series. Radioluminescence and photoluminescence of Cu-doped γ-LiAlO2 featured only the transition from 3d9 4s1 to 3d10 corresponding to Cu+ ions. On the other hand, Cu-doped α-LiAl5O8 samples showed mainly emissions associated with Fe3+ and Cr3+ impurities with overall very small intensity compared to the reference BGO scintillator. Samples of Cu-doped β-Li5AlO4 were prepared using a nitrates decomposition method. Due to the volatility of Li2O, the samples were not in a single phase and contained a certain amount of secondary γ-LiAlO2 phase, even though excess lithium was used for the sample preparation. Furthermore, samples with β-Li5AlO4 exhibited strong hygroscopic properties, making Li5AlO4 an undesirable host material outside of a controlled atmosphere environment.
Trvalý link: https://hdl.handle.net/11104/0333206