Luminescence of F0 centers in CeO2 nanocrystals

V. V. Seminko Institute for Scintillation Materials of National Academy of Sciences
P. O. Maksimchuk Institute for Scintillation Materials of National Academy of Sciences
N. V. Kononets Institute for Scintillation Materials of National Academy of Sciences
E. N. Okrushko Institute for Scintillation Materials of National Academy of Sciences
I. I. Bespalova Institute for Scintillation Materials of National Academy of Sciences
A. A. Masalov Institute for Scintillation Materials of National Academy of Sciences
Yu. V. Malyukin Institute for Scintillation Materials of National Academy of Sciences
Yu. I. Boyko V. N. Karazin Kharkiv National University

Keywords: ceria, F-centers, luminescence, nanocrystals,

Abstract

In the paper luminescent properties of CeO2-x (ceria) nanocrystals are discussed. Ceria nanocrystals with different oxygen non-stoichiometry were obtained using sol-gel method and subsequent annealing in oxidizing or reducing atmosphere. Luminescence spectra of ceria nanocrystals reveal three types of luminescent centers. Beyond previously observed 4f-5d luminescence of Ce3+ ions and charge transfer (CT) luminescence determined by radiative relaxation in Ce4+-O2- complexes, wide luminescence band formed by F0 centers was revealed. Ratio between luminescent centers of different types can be varied by variation of treatment atmosphere. Luminescence of Ce3+ ions is the most intensive in reducing atmosphere due to highest content of oxygen vacancies, and, correspondingly, of Ce3+ ions. As CT luminescence of Ce4+-O2- complexes, so luminescence of F0 centers demonstrate strong quenching with temperature increase; however CT luminescence quenching is more pronounced than quenching of luminescence for F0 centers.

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