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Defect and intrinsic luminescence of CeO 2 nanocrystals
Author(s) -
Seminko Vladyslav,
Maksimchuk Pavel,
Bespalova Irina,
Masalov Andrey,
Viagin Oleg,
Okrushko Elena,
Kots Nataliia,
Malyukin Yuri
Publication year - 2017
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600488
Subject(s) - luminescence , nanocrystal , excitation , ion , materials science , relaxation (psychology) , trapping , charge (physics) , persistent luminescence , atomic physics , chemical physics , oxygen , photochemistry , nanotechnology , optoelectronics , chemistry , physics , thermoluminescence , psychology , social psychology , ecology , organic chemistry , quantum mechanics , biology
In the paper, the luminescence processes in CeO 2 nanocrystals have been investigated and several types of luminescent centers were revealed. For CeO 2 nanocrystals treated in oxidation atmosphere two possible pathways of relaxation of the charge transfer excitation led to intrinsic charge transfer (CT) luminescence and luminescence of F 0 ‐centers. Treatment in reducing atmosphere leads to formation of additional luminescent centers formed by Ce 3+ ions which charge is compensated by oxygen vacancies in first coordination sphere of Ce 3+ ion. Shallow defects related to F + ‐centers present near edge of 4f 0 band modify sufficiently the processes of excitation relaxation forming excitation traps that provide a series of trapping–retrapping acts during excitation lifetime.
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