Growth, structural and optical characterizations of LiLa(1-x)Eux(WO4)(2) single-crystalline fibers by the micro-pulling-down method

Autor(es)

de Moraes, Jair Ricardo ^[1] ; Baldochi, Sonia Licia ^[1] ; Leano Soares, Leonardo dos Reis ^[1] ; Mazzocchi, Vera Lucia ^[1] ; Ramos Parente, Carlos Benedicto ^[1] ; Courrol, Lilia Coronato ^[2]

Afiliação do(s) autor(es)

^[1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, UNIFESP, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Research Bulletin; v. 47, n. 3, p. 744-749, MAR 2012.
• Citações Web of Science: 7

Resumo

Transparent and uniform LiLa(1-x)Eux(WO4)(2) single-crystalline fibers where x = 0.005, 0.01, 0.03, 0.05, 0.07, 0.1, 0.15, 0.2, 0.25 and 1.0, with an average of 20-40 mm length were obtained by the micro-pulling-down method aiming structural and optical characterization. The optimum pulling rate was found to depend on the difference between alkali and rare earth ionic radii. Rietveld analysis from X-ray diffraction data and excitation spectroscopy at room temperature were applied to investigate the lattice changes due to the Eu3+ incorporation in the host. LiLa(1-x)Eux(WO4)(2) crystal fibers present red emission due to the electric dipole D-5(0) -> F-7(2) transition under 395 nm excitation showing a concentration quenching around 20 mol% of doping. The excitation spectra of the F-7(0) -> D-5(0) transition show small changes in the Eu3+ surroundings as function of dopant concentration. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 08/10721-9 - Estudo da preparação de microcristais de LiLa(WO4)2:TR3+ para aplicações fotônicas
• Beneficiário: Jair Ricardo de Moraes
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 96/09604-9 - Laboratório de análise de materiais cerâmicos, metálicos e compósitos por difração de Raios X
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Programa Infraestrutura - Equipamentos
• Processo FAPESP: 06/58686-1 - Estudo da preparacao de fibras cristalinas de compostos tipo a(tr)(wo4)2 puros e dopados, onde a=na, li e (tr)=la3+, gd3+, yb3+ e nd3+.
• Beneficiário: Jair Ricardo de Moraes
• Modalidade de apoio: Bolsas no Brasil - Mestrado