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dc.contributor.authorOliveira, J. C.-
dc.contributor.authorCavaleiro, A.-
dc.contributor.authorVieira, M. T.-
dc.contributor.authorBigot, L.-
dc.contributor.authorGarapon, C.-
dc.contributor.authorJacquier, B.-
dc.contributor.authorMugnier, J.-
dc.identifier.citationOptical Materials. 24:1-2 (2003) 321-325en_US
dc.description.abstractIn the aim of better understand the influence of oxygen on the luminescent properties of Er:AlN films, two samples synthesized by radiofrequency reactive magnetron sputtering, have been analysed by site-selective spectroscopy around 1.55 [mu]m and compared to a reference aluminosilicate sample. The erbium content in the films was estimated to 3.3 at.% and oxygen content ranges from 6.2 at.% to 58.6 at.% (determination by EPMA). Line narrowing study was performed for values 6.2 at.% and 22.5 at.%. Both films were annealed at 1075 K for 1 h. Site-selective spectroscopy was carried out using a Ti:sapphire laser light with typical linewidth of 2 GHz tuned around 980 nm as the excitation source. The samples were cooled down to 1.5 K in a liquid-helium bath cryostat and their 4I13/2<-->4I15/2 luminescence was detected using a high-sensitivity germanium-cooled detector. It appears that the site distribution of the Er:AlN samples is not continuous as in classical aluminosilicate glass but presents a rupture that suggests the existence of two kinds of sites for erbium: oxygen site and nitrogen site. These observations can easily be interpreted within the framework of the nephelauxetic effect that explains a shift of the site distribution to the longer wavelengths with an increase of boundings bonding covalency.en_US
dc.titleOxygen sensitivity of erbium-doped AlN films probed by site selective spectroscopyen_US
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item.grantfulltextopen- for Mechanical Engineering-
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais
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