Sol-Gel Derived Eu3 -Doped Gd2Ti2O7 Pyrochlore NanopowdersReportar como inadecuado

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Journal of Nanomaterials - Volume 2015 2015, Article ID 514173, 8 pages -

Research ArticleVinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia

Received 4 December 2014; Revised 10 February 2015; Accepted 11 February 2015

Academic Editor: Alan K. T. Lau

Copyright © 2015 Sanja Ćulubrk et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Herein we presented hydrolytic sol-gel synthesis and photoluminescent properties of Eu

-doped Gd2Ti2O7 pyrochlore nanopowders. According to Gd2Ti2O7 precursor gel thermal analysis a temperature of 840°C is identified for the formation of the crystalline pyrochlore phase. Obtained samples were systematically characterized by powder X-ray diffraction, scanning and transmission electron microscopy, and photoluminescence spectroscopy. The powders consist of well-crystalline cubic nanocrystallites of approximately 20 nm in size as evidenced from X-ray diffraction. The scanning and transmission electron microscopy shows that investigated Eu

-doped Gd2Ti2O7 nanopowders consist of compact, dense aggregates composed entirely of nanoparticles with variable both shape and dimension. The influence of Eu

ions concentration on the optical properties, namely, photoluminescence emission and decay time, is measured and discussed. Emission intensity as a function of Eu

ions concentration shows that Gd2Ti2O7 host can accept Eu

ions in concentrations up to 10 at.%. On the other hand, lifetime values are similar up to 3 at.% ~2.7 ms and experience decrease at higher concentrations 2.4 ms for 10 at.% Eu

. Moreover, photoluminescent spectra and lifetime values clearly revealed presence of structural defects in sol-gel derived materials proposing photoluminescent spectroscopy as a sensitive tool for monitoring structural changes in both steady state and lifetime domains.

Autor: Sanja Ćulubrk, Željka Antić, Vesna Lojpur, Milena Marinović-Cincović, and Miroslav D. Dramićanin



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