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https://hdl.handle.net/10316/4268
Título: | Oxygen sensitivity of erbium-doped AlN films probed by site selective spectroscopy | Autor: | Oliveira, J. C. Cavaleiro, A. Vieira, M. T. Bigot, L. Garapon, C. Jacquier, B. Mugnier, J. |
Palavras-chave: | Photoluminescence | Data: | 2003 | Citação: | Optical Materials. 24:1-2 (2003) 321-325 | Resumo: | In 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. | URI: | https://hdl.handle.net/10316/4268 | DOI: | 10.1016/S0925-3467(03)00143-5 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Eng.Mecânica - Artigos em Revistas Internacionais |
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