Luminescence and photoionization of X-ray generated Sm²⁺ in coprecipitated CaF2 nanocrystals

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dc.contributor.authorRozaila, Z.S.
dc.contributor.authorRiesen, N.
dc.contributor.authorRiesen, H.
dc.date.issued2021
dc.description.abstractWe report photoluminescence and photoionization properties of Sm2+ ions generated by X-irradiation of nanocrystalline CaF2:Sm3+ prepared by coprecipitation. The nanocrystals were of 46 nm average crystallite size with a distribution of ±20 nm and they were characterised by XRD, TEM and SEM-EDS. At room temperature, the X-irradiated sample displayed broad electric dipole allowed Sm2+ 4f55d (A1u) → 4f6 7F1 (T1g) luminescence at 725 nm that narrowed to an intense peak at 708 nm on cooling to ∼30 K. The narrow f–f transitions of Sm3+ were also observed. The X-irradiation-induced reduction of Sm3+ + e− → Sm2+ as a function of X-ray dose was investigated over a very wide dynamic range from 0.01 mGy to 850 Gy by monitoring the photoluminescence intensities of both Sm2+ and Sm3+ ions. The reverse Sm2+ → Sm3+ + e− photoionization can be modelled by employing dispersive first-order kinetics and using a standard gamma distribution function, yielding an average separation of 13 Å between the Sm2+ ions and the hole traps (e.g. oxide ion impurities). The present results point towards potential applications of Sm doped CaF2 nanocrystals in the fields of dosimetry and X-ray imaging.
dc.description.statementofresponsibilityZ. Siti Rozaila, Nicolas Riesen and Hans Riesen
dc.identifier.citationDalton Transactions, 2021; 50(44):16205-16213
dc.identifier.doi10.1039/d1dt03024h
dc.identifier.issn1477-9226
dc.identifier.issn1477-9234
dc.identifier.orcidRiesen, N. [0000-0002-6803-0666]
dc.identifier.urihttps://hdl.handle.net/2440/134321
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.granthttp://purl.org/au-research/grants/arc/IH150100028
dc.rights© The Royal Society of Chemistry 2021
dc.source.urihttps://doi.org/10.1039/d1dt03024h
dc.subjectCalcium Fluoride
dc.subjectSamarium
dc.subjectX-Rays
dc.subjectLuminescence
dc.subjectNanoparticles
dc.titleLuminescence and photoionization of X-ray generated Sm²⁺ in coprecipitated CaF2 nanocrystals
dc.title.alternativeLuminescence and photoionization of X-ray generated Sm(2+) in coprecipitated CaF2 nanocrystals
dc.typeJournal article
pubs.publication-statusPublished

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