Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 66, Issue 6, Pages 1008-1019Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2005.01.002
Keywords
nanostructures; X-ray diffraction; luminescence; optical properties
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Eu3+ :NaGdF4 samples were obtained via co-precipitation in aqueous solution (Cl?), reversed micelle (RM) method, reaction between solid GdF3 and NaF solution (SR) as well as a solid-state reaction at high temperatures (SS). The synthesised materials were characterised using X-ray powder diffractometry, TEM microscopy, infrared spectroscopy and TGA analysis. For discussion of optical proper-ties excitation and emission spectra were recorded and emission decay times were measured. The CP and RM methods allow to obtain powders with crystallite size of similar to 10 nm, which may be smoothly increased to about 1 mu m during post-fabrication heat treatment. Differences in structural and especially in optical properties of phosphors prepared by different techniques are emphasised and applicability of wet-chemistry routes for synthesis of fluoride powders is argued. (c) 2005 Elsevier Ltd. All rights reserved.
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