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TitleObservation of photoluminescence and radioluminescence in Eu and Mn doped NaMgF3 nanoparticles
Publication TypeJournal Article
Year of Publication2013
AuthorsWilliams, G.V.M., Janssens S., Gaedtke C., Raymond S.G., and Clarke D.J.
JournalJournal of Luminescence
Pagination219 - 225
Date Published2013
ISSN00222313 (ISSN)
Keywordsenergy transfer, Internal quantum efficiency, Manganese, Micro-emulsion methods, Mn-doped, NaMgF<sub>3</sub>, Nanoparticles, Nonradiative decays, Photoluminescence, PL emission, PL lifetime, Radio-luminescence
AbstractEu and Mn doped NaMgF3 nanoparticles have been made using a reverse micro-emulsion method. All nanoparticles show Mn2+, Eu 2+, or Eu3+ photoluminescence (PL) and radioluminescence (RL) as well as PL from an unidentified defect that does not display RL. The Mn2+ sample contains PL emissions from distorted and undistorted Mn2+ sites but the RL is dominated by the undistorted Mn2+ site. The PL lifetime is lowest for the highest Eu concentration. This may be due to energy transfer from Eu3+ sites in the core to Eu3+ sites near the surface followed by non-radiative decay. However, the possibility that Eu3+ substitution leads to more non-radiative decay sites in the core cannot be excluded. The internal quantum efficiency at 270 K is highest for the NaMgF3:1% Eu nanoparticles (76%). The RL is independent of dose after an initial ∼10 kGy irradiation. © 2013 Published by Elsevier B.V.

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