Cathodoluminescence of cerium dioxide: Combined effects of the electron beam energy and sample temperature

Costantini, Jean Marc; Seo, Pooreun; Yasuda, Kazuhiro; Bhuian, Akm Saiful Islam; Ogawa, Tatsuhiko; Gourier, Didier

doi:10.1016/j.jlumin.2020.117379

Cited by 8 publications

(2 citation statements)

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“…The emission P3 in all the samples studied stays almost constant irrespective of processing atmosphere or temperature, with a slight increase as the oxygen partial pressure decreases. We ascribe this emission to F ++ configuration which is consistent with Costantini et al 34 According to them, the CL emission at P3 in CeO 2 originates from Ce 3+ ions which are not spatially adjacent to oxygen vacancies. As the F ++ configuration describes oxygen vacancies surrounded by Ce 4+ ions, their presence would imply the vacancy electron localized on a Ce 3+ ion at an undistorted site further from the vacancy.…”

Section: Resultssupporting

confidence: 92%

“…•• expected at 3 eV. 23 Additionally, some studies 33,34 have dismissed this P1 peak as being a product of element impurity, but the clear trend we observe in this peak as a function of oxygen partial pressure indicates that this is unlikely to be the case. For this reason, we propose different mechanisms that are in full accordance with the experimental results presented and the calculations reported in the literature.…”

Section: ■ Results and Discussionmentioning

confidence: 83%

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Oxygen Vacancy-Related Cathodoluminescence Quenching and Polarons in CeO₂

et al. 2020

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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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Section: Resultssupporting

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 83%