Síntese e Espectroscopia Óptica das fases estáveis do sistema Y2O3-Al2O3 dopadas com Nd3+ e Sm3+
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| Autore principale: | |
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| Data di pubblicazione: | 2013 |
| Natura: | Master thesis |
| Lingua: | por |
| Fonte: | Repositório Institucional da UFG |
| Download full: | http://repositorio.bc.ufg.br/tede/handle/tede/3844 |
Riassunto: | 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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