Low-temperature spectroscopy of optical centers in cerium-yttrium (Ce1–xYxO2–x/2) and cerium-zirconium (Ce1–xZrxO2) oxides
E.N. Okrushko, V.V. Seminko, P.O. Maksimchuk, I.I. Bespalova, N.V. Kononets, O.G. Viagin, and Yu.V. Malyukin
Institute for Scintillation Materials National Academy of Sciences of Ukraine, Nauky ave. 60, Kharkiv, 61072, Ukraine
Received November 10, 2016
In the paper the results of investigation of isovalent (Zr4+) and nonisovalent (Y3+) impurity ions influence on the formation of oxygen vacancies in the lattice of ceria nanocrystals are shown. It was shown that the content of oxygen vacancies increases significantly at incorporation of both Y3+ and Zr4+ ions, while the oxygen vacancies are involved in the formation of optical centers of the two types: Ce3+–V˙˙–Ce3+ complexes and F+ centers. The ratio between the optical centers of various types can be controlled by varying a concentration of impurity ions and atmosphere of high-temperature treatment of nanocrystal.
PACS: 78.55.–m Photoluminescence, properties and materials.
Key words: ceria, luminescence, F-centers.
Published online: March 24, 2017
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ISSN: 0132-6414 (Print) | ISSN: 1816-0328 (Online)