Preparation of YVO4:Eu3+ at low temperature by the hydrolytic sol-gel methodology

Autor(es)

Saltarelli, Michelle ^[1] ; Matos, Marcela G. ^[1] ; de Faria, Emerson H. ^[1] ; Ciuffi, Katia J. ^[1] ; Rocha, Lucas A. ^[1] ; Nassar, Eduardo J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Franca, BR-14404600 Franca, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Sol-Gel Science and Technology; v. 73, n. 2, p. 283-292, FEB 2015.
• Citações Web of Science: 5

Resumo

This work reports on the use of vanadium and yttrium alkoxides to prepare YVO4 doped with the europium (III) ion and assesses the influence of basic catalysts on the photoluminescence properties of the resulting material. The obtained powder was treated at different temperatures, namely 100, 400, 600, and 800 A degrees C, for 4 h. The XRD patterns revealed the formation of a YVO4 crystalline phase for the samples prepared with and without the catalyst, regardless of the heat-treatment temperature. The excitation spectra of the samples treated at different temperatures displayed the charge transfer band at high energy ascribed to the transition from the vanadate to the europium (III) ion. The emission spectra exhibited the characteristic transition bands arising from the excited level D-5(0) to manifolds F-7(J) (J = 0, 1, 2, 3, and 4), when the sample was excited at the charge transfer band and at the L-5(6) level of europium (III). The lifetime increased as a function of the temperature; it was higher than those reported for other samples prepared by other methodologies. The TEM micrographs evidenced cubic nanoparticles. Therefore, the sol-gel methodology affords YVO4:Eu3+ phosphors. (AU)

• Processo FAPESP: 11/09823-4 - Utilização do íon európio III para desvendar estruturas de matrizes obtidas via metodologia sol-gel
• Beneficiário: Eduardo José Nassar
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/11673-3 - Obtenção de filmes finos por spin e dip-coating usando a metodologia sol-gel
• Beneficiário: Eduardo José Nassar
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/20313-8 - Intensificação na luminescência dos íons lantanídeos (Eu3+, Tb³+ e Tm³+) incorporados nos óxidos GdAlO3, Y3Al5O12 e YVO4 empregando íons Bi3+
• Beneficiário: Marcela Guedes Matos
• Linha de fomento: Bolsas no Brasil - Doutorado