10 September 2010 Eu3+ as optical probe of the structure in amorphous and nanocrystalline TiO2 films prepared by sol-gel method
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Abstract
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.
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J. A. García-Macedo, J. A. García-Macedo, G. Valverde-Aguilar, G. Valverde-Aguilar, S. Flores-Duran, S. Flores-Duran, "Eu3+ as optical probe of the structure in amorphous and nanocrystalline TiO2 films prepared by sol-gel method", Proc. SPIE 7755, Nanophotonic Materials VII, 775503 (10 September 2010); doi: 10.1117/12.860043; https://doi.org/10.1117/12.860043
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