Oxygen Vacancy-Related Cathodoluminescence Quenching and Polarons in CeO2 | Zendy

Thanveer Thajudheen | Zendy; Alex G. Dixon | Zendy; Sandra Gardonio | Zendy; Iztok Arčon | Zendy; Matjaž Valant | Zendy

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Oxygen Vacancy-Related Cathodoluminescence Quenching and Polarons in CeO₂

Author(s) -

Thanveer Thajudheen,

Alex G. Dixon,

Sandra Gardonio,

Iztok Arčon,

Matjaž Valant

Publication year - 2020

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.0c04631

Subject(s) - cathodoluminescence , polaron , oxygen , materials science , quenching (fluorescence) , vacancy defect , condensed matter physics , physics , optoelectronics , luminescence , nuclear physics , optics , electron , fluorescence , quantum mechanics

We used cathodoluminescence (CL) spectroscopy to characterize the oxygen vacancies (V O ) in ceria (CeO 2 ). The effects of the processing atmosphere and thermal quenching temperature on the nature and distribution of the intrinsic defects and on the spectroscopic behavior were investigated. The presence of polarons and associates of the polarons with the oxygen vacancies such as (V O •• -Ce Ce ' ) • is demonstrated. CL intensity quenching above a critical concentration of V O has been shown. Even though the emission centers in all samples are the same, their concentration changes with the oxygen partial pressure of the processing atmosphere. Deconvolution of the observed CL spectra shows that the emissions originating from the F 0 centers prevail over those of F + centers of V O when the defect concentration is high.

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