Journal
JOURNAL OF LUMINESCENCE
Volume 143, Issue -, Pages 219-225Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2013.05.016
Keywords
NaMgF3; Nanoparticles; Photoluminescence; Radioluminescence
Categories
Funding
- New Zealand Ministry of Business and Innovation [VICX0806]
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [VICX0806] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
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Eu and Mn doped NaMgF3 nanoparticles have been made using a reverse micro-emulsion method. All nanoparticles show Mn2+, Eu2+, 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 similar to 10 kGy irradiation. (C) 2013 Elsevier B.V. All rights reserved.
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