Investigations on electron beam irradiated rare-earth doped SrF2 for application as low fading dosimeter material: evidence for and DFT simulation of a radiation-induced phase

Michael Arnold; Julia Katzmann; Aakash Naik; Arno L. Görne; Thomas Härtling; Janine George; Christiane Schuster

doi:10.1039/D2TC01773C

Investigations on electron beam irradiated rare-earth doped SrF₂ for application as low fading dosimeter material: evidence for and DFT simulation of a radiation-induced phase†

Michael Arnold,

*^a Julia Katzmann,^b Aakash Naik,

^cd Arno L. Görne,

^a Thomas Härtling,^be Janine George

^cd and Christiane Schuster^b

Author affiliations

* Corresponding authors

^a Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Michael-Faraday-Strasse 1, 07629 Hermsdorf, Germany
E-mail: michael.arnold@ikts.fraunhofer.de

^b Fraunhofer Institute for Ceramic Technologies and Systems (IKTS), Maria-Reiche-Strasse 2, 01109 Dresden, Germany

^c Bundesanstalt für Materialforschung-und Prüfung, Unter den Eichen 87, 12205 Berlin, Germany

^d Friedrich-Schiller-University Jena, Institute of Condensed Matter Theory and Solid State Optics, Max-Wien-Platz 1, 07743 Jena, Germany

^e Institute for Solid State Electronics, Technische Universität Dresden, 01062 Dresden, Germany

Abstract

A recent approach to measure electron radiation doses in the kGy range is the use of phosphors with an irradiation dose-dependent luminescence decay time. However, the applicability of the previously investigated material NaYF₄:Yb³⁺,Er³⁺ is limited as it shows pronounced fading. Therefore, in this work, a modified SrF₂ synthesis is presented that results in SrF₂ nanoparticles codoped with Yb and either Er, Hm, or Tm. To assess their suitability as dosimeter material, dose response, as well as its degree of fading over 50 up to 140 days after irradiation were measured. Fading rates as small as 5% in SrF₂:Er,Yb and 4% in SrF₂:Ho,Yb were derived, which are comparable to established dosimeter materials. A combination of spectroscopy, diffraction and DFT calculations was used to elucidate the effect of irradiation, pointing towards the formation of a secondary phase of Yb²⁺ that we predict could be Yb₂OF₂. This irreversible formation of a secondary phase is considered to be the explanation for the low fading behavior in SrF₂-based phosphors compared to NaYF₄:Yb, Er, a highly attractive feature for electron beam dosimetry.

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DOI: https://doi.org/10.1039/D2TC01773C
Article type: Paper
Submitted: 29 Apr 2022
Accepted: 13 Jul 2022
First published: 14 Jul 2022
This article is Open Access

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J. Mater. Chem. C, 2022,10, 11579-11587

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Investigations on electron beam irradiated rare-earth doped SrF₂ for application as low fading dosimeter material: evidence for and DFT simulation of a radiation-induced phase

M. Arnold, J. Katzmann, A. Naik, A. L. Görne, T. Härtling, J. George and C. Schuster, J. Mater. Chem. C, 2022, 10, 11579 DOI: 10.1039/D2TC01773C

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Journal of Materials Chemistry C

Investigations on electron beam irradiated rare-earth doped SrF₂ for application as low fading dosimeter material: evidence for and DFT simulation of a radiation-induced phase†

Abstract

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Investigations on electron beam irradiated rare-earth doped SrF₂ for application as low fading dosimeter material: evidence for and DFT simulation of a radiation-induced phase

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Journal of Materials Chemistry C