The role of the Eu3+ ions in structure and photoluminescence properties of SrBi2Nb2O9 powders

Autor(es)

Volanti, Diogo P. ^[1] ; Rosa, Ieda L. V. ^[2] ; Paris, Elaine C. ^[3] ; Paskocimas, Carlos A. ^[4] ; Pizani, Paulo S. ^[5] ; Varela, Jose A. ^[1] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, UNESP, Inst Chem, BR-14800900 Araraquara, SP - Brazil

^[2] Univ Fed Sao Carlos, UFSCar, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed Paraiba, Dept Chem, UFPB, BR-58059900 Joao Pessoa, Paraiba - Brazil

^[4] Univ Fed Rio Grande do Norte, UFRN, Dept Mech Engn, BR-59072970 Natal, RN - Brazil

^[5] Univ Fed Sao Carlos, Dept Phys, UFSCar, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 31, n. 6, p. 995-999, APR 2009.
• Citações Web of Science: 49

Resumo

This work rationalized for the first time the key role of Eu(3+) ion in the doping process of SrBi(2)Nb(2)O(9) (SBN) compound. This process allows LIS to understand the role of Eu(3+) as lattice modifier as well as to obtain information on the crystalline structure surrounding. Therefore, the SBN and Eu(3+) doped SBN (SBN:Eu) were synthesized using the polymeric precursor method (PPM). Scanning electron microscope (SEM) images reveal the strong influence of europium on the SBN microstructure. Thermogravimetry (TG) and differential thermal analysis (DTA) techniques were used to determine the weight loss and changes associated with phase transitions in SBN during thermal evolution. The behavior of the Eu(3+) lattice modifier was followed in a long-range order by X-ray diffraction (XRD), while Fourier transform Raman (FT-Raman) spectroscopy was used to analyze the short-range order. To this end, the SBN orthorhombic phase was observed for all samples hear treated from 400 to 700 degrees C for 2 h. In addition, photoluminescence measurements were employed to study the structural modifications in SBN lattice. The characteristic red emission of the Eu(3+) using the 488 nm exciting wavelength of an argon-ion laser was distinctly observed for SBN:Eu samples heat treated from 550 to 700 degrees C. Europium characteristic emission bands are related to (5)D(l)->(7)F(J) (J = 0-2) transitions at 538 and 555 nm, as well as the (5)D(0)->(7)F(J) (J = 0-4) ones at 580, 592, 615, 653 and 695 nm. By means of the emission spectra analyses it was possible to predict that the Eu(3+) ions are located at sites of higher symmetry, since the relative area of the ((5)D(0)->(7)F(2))/((5)D(0)->(7)F(1)) transitions for the SBN:Eu samples decrease from 3.82 to 2.60 with increasing temperature from 550 to 700 degrees C. (c) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 98/14324-0 - Multidisciplinary Center for Development of Ceramic Materials
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs