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Lima, R.C., Macario, L.R., Espinosa, J.W.M., Longo, V.M., Erlo, R., Marana, N.L., Sambrano, J.R., Santos, M.L.D., Moura, A.P., Pizani, P.S., Andres, J., Longo, E. and Varela, J.A. (2008) Toward an Understanding of Intermediate- and Short-Range Defects in ZnO Single Crystals. A Combined Experimental and Theoretical Study. The Journal of Physical Chemistry A, 112, 8970-8978. http://dx.doi.org/10.1021/jp8022474

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• TITLE: Synthesis, Structural and Photophysical Properties of Gd2O3:Eu3+ Nanostructures Prepared by a Microwave Sintering Process

  AUTHORS: Ana P. de Moura, Larissa H. Oliveira, Icamira C. Nogueira, Paula F. S. Pereira, Maximo S. Li, Elson Longo, José A. Varela, Ieda L. V. Rosa

  KEYWORDS: Gadolinuim Oxide, Europium Luminescence, Nanorods

  JOURNAL NAME: Advances in Chemical Engineering and Science, Vol.4 No.3, July 25, 2014

  ABSTRACT: In this paper, we report the obtention of gadolinium oxide doped with europium (Gd2O3:Eu+3) by thermal decomposition of the Gd(OH)3:Eu3+ precursor prepared by the microwave assisted hydrothermal method. These systems were analyzed by thermalgravimetric analyses (TGA/DTA), X-ray diffraction (XRD), structural Rietveld refinement method, fourrier transmission infrared absorbance spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM) and photoluminescence (PL) measurement. XRD patterns, Rietveld refinement analysis and FT-IR confirmed that the Gd(OH)3:Eu3+ precursor crystallize in a hexagonal structure and space group P6/m, while the Gd2O3:Eu3+ powders annealed in range of 500°C and 700°C crystallized in a cubic structure with space group Ia-3. FE-SEM images showed that Gd(OH)3:Eu3+ precursor and Gd2O3:Eu3+ are composed by aggregated and polydispersed particles structured as nanorods-like morphology. The excitation spectra consisted of an intense broad band with a maximum at 263 nm and the Eu3+ ions can be excitated via matrix. The emission spectra presented the characteristics transitions of the Eu3+ ion, whose main emission, , is observed at 612 nm. The photophysical properties indicated that the microwave sintering treatment favored the Eu3+ ions connected to the O-Gd linkages in the Gd2O3 matrix. Also, the emission in the Gd2O3:Eu3+ comes from the energy transfered from the Gd-O linkages to the clusters in the crystalline structure.