| Title | Observation of photoluminescence and radioluminescence in Eu and Mn doped NaMgF3 nanoparticles |
| Publication Type | Journal Article |
| Year of Publication | 2013 |
| Authors | Williams, G.V.M., Janssens S., Gaedtke C., Raymond S.G., and Clarke D.J. |
| Journal | Journal of Luminescence |
| Volume | 143 |
| Pagination | 219 - 225 |
| Date Published | 2013 |
| ISSN | 00222313 (ISSN) |
| Keywords | energy transfer, Internal quantum efficiency, Manganese, Micro-emulsion methods, Mn-doped, NaMgF<sub>3</sub>, Nanoparticles, Nonradiative decays, Photoluminescence, PL emission, PL lifetime, Radio-luminescence |
| Abstract | Eu 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. |
| URL | http://www.scopus.com/inward/record.url?eid=2-s2.0-84878371826&partnerID=40&md5=2dfea69552a89d3bcad1e2bc87d1eb93 |
| DOI | 10.1016/j.jlumin.2013.05.016 |
