Eu3+ as optical probe of the structure in amorphous and nanocrystalline TiO2 films prepared by sol-gel method

J. A. García-Macedo; G. Valverde-Aguilar; S. Flores-Duran

doi:10.1117/12.860043

10 September 2010 Eu³⁺ as optical probe of the structure in amorphous and nanocrystalline TiO₂ films prepared by sol-gel method

J. A. García-Macedo, G. Valverde-Aguilar, S. Flores-Duran

Author Affiliations +

Proceedings Volume 7755, Nanophotonic Materials VII; 775503 (2010) https://doi.org/10.1117/12.860043
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

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.

Citation Download Citation

J. A. García-Macedo, G. Valverde-Aguilar, and 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); https://doi.org/10.1117/12.860043

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