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Evidence of transient species occurring in the reduction process of trivalent lanthanides under 2.5 MeV electron irradiation by in situ cathodoluminescence and time-resolved photoluminescence

Abstract : In situ cathodoluminescence and time-resolved photoluminescence measurements were carried out on Sm-doped glasses during a 2.5 MeV electron irradiation. These experiments allow characterizing more precisely the mechanisms operating under irradiation and more specifically the reduction processes of Sm3+ to Sm2+ ions. Sm2+ emission lines appear in the first steps of the irradiation, however, the 5D0→7F0–2 emission lines of Sm2+ were not observed on the cathodoluminescence spectrum. Moreover, two sites of Sm2+ have been evidenced in the glasses; the formation of each species is clearly different. Relaxation processes of Sm3+ and Sm2+ leads to consider the existence of different transient states of Sm3+ and Sm2+ species which are annealed after irradiation. We propose some synthetic schemes of the reduction mechanisms produced during the irradiation.
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https://hal-cea.archives-ouvertes.fr/cea-00407923
Contributor : Chantal Brassy <>
Submitted on : Monday, July 27, 2009 - 9:39:13 PM
Last modification on : Friday, July 31, 2020 - 9:24:05 AM

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  • HAL Id : cea-00407923, version 1

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Nadège Ollier, B. Boizot, P. l'Henoret, Stephane Guillous, G. Petite. Evidence of transient species occurring in the reduction process of trivalent lanthanides under 2.5 MeV electron irradiation by in situ cathodoluminescence and time-resolved photoluminescence. Journal of Applied Physics, American Institute of Physics, 2009, 105, pp.113515. ⟨cea-00407923⟩

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