Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5400046 | Journal of Luminescence | 2014 | 6 Pages |
Abstract
We used the non-hydrolytic sol-gel route to synthesize YVO4 crystalline phases doped with europium III ion. We heat-treated the samples at 600, 800, and 1000 °C and characterized the materials by thermal analysis, X-ray diffraction, small-angle X-ray scattering, and photoluminescence. Larger weight loss occurred until 500 °C, ascribed to removal of residual precursor molecules. X-ray diffraction patterns evidenced YVO4 phase formation at 600 °C. The crystallite size depended on the heat treatment temperature. SAXS showed that the nature of the system interfaces changed as a function of the thermal treatment. The excitation spectra of the samples displayed the charge transfer band. The photoluminescence data revealed the characteristic transition bands arising from the 5D0â5FJ (J=0, 1, 2, 3, and 4) manifolds under maximum excitation at the charge transfer band and the 5L6 level of the Eu3+ ion. The 5D0â7F2 transition dominated the emission spectra, indicating that the Eu3+ ion occupies a site without inversion center. The lifetime and quantum efficiency values were about 0.70 ms and 50%, respectively, corroborating literature results.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Marcela G. Matos, Emerson H. de Faria, Lucas A. Rocha, Paulo S. Calefi, Katia J. Ciuffi, Eduardo J. Nassar, Victor Hugo Vitorino Sarmento,