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Título : Eu3+ as optical probe of the structure in amorphous and nanocrystalline TiO2 films prepared by sol-gel method
Palabras clave : luminescence
rare earth
Fecha de publicación : 16-ene-2013
Editorial : SPIE Proceedings
Descripción : In this work the Eu3+ ion was used as optical probe, by considering its hypersensitive transitions to follow changes in the local environment. Eu3+ ions were incorporated into gel via dissolution of soluble species into the initial precursor TiO2 sol. The TiO2/Eu3+ films were spin-coated on glass wafers. A spectroscopic study of the Eu3+ impurity in function of the heat treatment provided to the TiO2 matrix was done. Anatase nanophase was obtained after heat treatment at 600°C for 1h and it was detected by X-ray diffraction. An absorption band located in the UV region between 300-360 nm is due to the band gap of the titania host. Results of emission and excitation spectra at room temperature of Eu3+ inserted in the TiO2 matrix are presented. The ratio of the 7F2/7F1 transitions was calculated. The evolution of this ratio was interpreted in terms of the Eu3+ symmetry site change when the nanocrystalline TiO2 phase was obtained.
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/10679
Otros identificadores : 0277-786X
Aparece en las colecciones: Doctorado

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