2014-12-292013-11-28SILVA, 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.http://repositorio.bc.ufg.br/tede/handle/tede/3844The 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.application/pdfAcesso AbertoMicroscopia eletrônicaTransmissãoLaser - fabricaçãoAnalises de fotoluminescênciaTransmission electronic microscopyLaser - manufacturePhotoluminescence analysisQUIMICA::QUIMICA ANALITICADissertação