Navegando por Autor "Rastrelo, Lara Rossana"

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    Síntese, caracterização e fotoluminescência de titanatos de cálcio dopados com íons Tm³+, Tb³+ e Sm³+
    (Universidade Federal de Goiás, 2013-12-06) Rastrelo, Lara Rossana; Figueiredo, Alberthmeiry Teixeira de; http://lattes.cnpq.br/7026388762536003; Figueiredo, Alberthmeiry Teixeira de; http://lattes.cnpq.br/7026388762536003; Machado, Antonio Eduardo da Hora; http://lattes.cnpq.br/3109230347623391; Zampieri, Marcelo; http://lattes.cnpq.br/6834951349421487
    The photoluminescent properties (FL) has always aroused the interest of the scientific community, especially after the discovery of photoluminescence at room temperature, which favors applications in new optical-electronic devices. This work used the Polymeric Precursors Method to obtain CTO doped with rare earth ion: Tm3+, Tb3+ and Sm3+. The materials: CTO:Sm1,2%,Tb0,3%,Tm0,5% and CTO:Sm2%,Tb0,3%,Tm0,5% were calcined at temperatures of 450, 500, 550 and 600 ° C in order to correlate structural changes and photoluminescence emission. Other materials: CTO:Sm1,2%,Tm0,5%, CTO:Tm0,5%,Tb0,3%, CTO:Sm1,2%,Tb0,3%, CTO:Sm1,2%Tb0,3%, CTO:Tb0,3%, CTO:Tm0,5%, CTO:Sm1,2% and CTO:Sm2% were calcined at 600 ° C in order to comprehend the influence of rare earth ions in photoluminescence emission process. The structural organization of the materials over long distances CTO:Sm1,2%,Tb0,3%,Tm0,5% was correlated with the emission FL. The FL intensity can be linked directly to the structural system, and the material totally disorganized or completely organized does not present FL emission. The material CTO:Sm1,2%,Tb0,3%,Tm0,5% showed the highest intensity FL to materials heat treated at 500oC, while the material CTO:Sm2%,Tb0,3%,Tm0,5% showed the highest intensity FL to materials heat treated at 450 oC. The electronic transitions from rare earth ions was observed to the obtained materials.