Síntese e Espectroscopia Óptica das fases estáveis do sistema Y2O3-Al2O3 dopadas com Nd3+ e Sm3+
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Data
2013-11-28
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Universidade Federal de Goiás
Resumo
The development of rare earths luminescent materials has been
subject of many research works searching for technological applications in
the manufacture of solid-state lasers, photonic and biomedical devices,
manufacturing of displays, and others. The system Y2O3-Al2O3 has three
stable crystalline phases: Y3Al5O12 (YAG), YAlO3 (YAP) and Y4Al2O9 (YAM).
Among them, YAP and YAG are widely studied and used in the manufacture
of solid-state lasers. In this work, we used the modified polymeric precursor
method to synthesize YAG, YAP, and YAM doped with 0.5 and 1% of Nd3+
and Sm3+ ions replacing Y3+. Analysis of X ray diffraction and vibrational
spectroscopy confirmed the achievement of crystalline single phases.
Transmission electron images show grain sizes ranging from 80 to 300 nm.
We verified a strong influence of the different matrices symmetries on the
optical emission of these rare earths photoluminescent ions.
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SILVA, Tarcio de Castro. Síntese e Espectroscopia Óptica das fases estáveis do sistema Y2O3-Al2O3 dopadas com Nd3+ e Sm3+. 2013. 73 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2013.