Effect of oxygen nonstoichiometry on the formation of luminescence centers in cerium dioxide nanocrystals
Abstract
Use of nanocrystalline CeO2 for biomedical applications seems very perspective. Oxygen nonstoichiometry defines basic biomedical properties of cerium oxide — the ability to participate in redox processes taking place in the organism. CeO2 nanocrystals with different degrees of oxygen nonstoichiometry have been investigated by means of luminescence spectroscopy techniques. It has been shown that depending on the content of oxygen vacancies in the nanocrystals two different types of optical centers are formed. Luminescence of these centers can be ascribed to different electronic transitions of cerium ions. The first type of centers is Ce4+ - O2- charge transfer complex, while the second one is Ce3+ ions. Luminescent characteristics of different optical centers have been investigated.
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