Er{sup 3+}-doped PbF{sub 2}: Comparison between nanocrystals in glass-ceramics and bulk single crystals
- Laboratoire de Chimie Appliquee de l'Etat Solide, CNRS-UMR 7574, ENSCP-11, rue Curie-F-75005 Paris (France)
- Laboratoire de Photonique et de Nanostructures, CNRS-UPR20, route de Nozay-F-91460 Marcoussis (France)
An appropriate annealing of a GeO{sub 2}-PbO-PbF{sub 2}:ErF{sub 3} glass leads to the formation of a glass-ceramic, composed of Pb{sub 1-} {sub x} Er {sub x} F{sub 2+} {sub x} nanosized crystallites dispersed throughout an amorphous oxide matrix. These nanocrystallites are compared to Er{sup 3+}-doped PbF{sub 2} bulk single crystals. The influence of the annealing temperature on the glass-ceramics characteristics is thoroughly investigated. For several glass-ceramics resulting from different heat treatments, the quantity of crystallized PbF{sub 2}, as well as the segregation of Er{sup 3+} ions into the crystallites, has been studied through two methods: first, the study of the crystallographic characteristics and second, the evolution of the optical properties. It was evidenced that, for a heat treatment over 365 deg. C, the whole PbF{sub 2}:Er has completely crystallized and that the segregation of Er{sup 3+} ions into the crystallites was total. Strong interactions between Er{sup 3+} ions occur in the Pb{sub 1-} {sub x} Er {sub x} F{sub 2+} {sub x} single and nanocrystals, promoting cross-relaxation processes, under 488-nm excitation, and favouring the 660- (red) and 810-nm emissions at the expense of the 550-nm (green) one. - Graphical abstract: TEM image of an oxyfluoride glass-ceramic containing Er{sup 3+}-doped {beta}-PbF{sub 2} nanocrystals. Display Omitted.
- OSTI ID:
- 20905341
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 7; Other Information: DOI: 10.1016/j.jssc.2006.03.038; PII: S0022-4596(06)00186-1; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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