Eu(III) incorporation in sol-gel aluminum-yttrium matrix by non-hydrolytic route
authors Nassar, EJ; Avila, LR; Pereira, PFS; Mello, C; de Lima, OJ; Ciuffi, KJ; Carlos, LD
nationality International
author keywords sol-gel; luminescence; YAG; YAM
abstract The sol-gel method using metal alkoxide has been investigated to prepare aluminum yttrium oxide as yttrium-aluminum garnet (YAG) matrix composite fiber. In this paper we investigate the influence of yttrium content and temperature in the synthesis of Eu(III)-doped aluminum-yttrium oxide by non-hydrolytic sol gel route. The formation process and the local structure of the samples were discussed by means of X-ray diffraction (XRD), thermo gravimetric analysis (TGA), scanning electron microscopy (SEM) and photoluminescence (PL) spectroscopy. For temperatures around 800degreesC, initial crystallization was observed and the phases Y4Al2O9 (YAM) and Y3Al5O12 (YAG) appear. For samples treated at 800 and 1500degreesC the emission spectra display preferentially the f-f transitions characteristic of the YAM monoclinic phase, whereas the YAG cubic appears as the favored phase at 1100degreesC, in accordance with the Eu(Ill) centrosymmetrical local site. (C) 2004 Elsevier B.V. All rights reserved.
issn 0022-2313
year published 2005
volume 111
issue 3
beginning page 159
ending page 166
digital object identifier (doi) 10.1016/j.jlumin.2004.07.007
web of science category Optics
subject category Optics
unique article identifier WOS:000226438700005
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