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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/37271
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dc.contributor.authorPires, Ana Maria-
dc.contributor.authorSerra, O. A.-
dc.contributor.authorDavolos, Marian Rosaly-
dc.date.accessioned2014-05-20T15:27:15Z-
dc.date.accessioned2016-10-25T18:02:02Z-
dc.date.available2014-05-20T15:27:15Z-
dc.date.available2016-10-25T18:02:02Z-
dc.date.issued2005-06-01-
dc.identifierhttp://dx.doi.org/10.1016/j.jlumin.2004.09.122-
dc.identifier.citationJournal of Luminescence. Amsterdam: Elsevier B.V., v. 113, n. 3-4, p. 174-182, 2005.-
dc.identifier.issn0022-2313-
dc.identifier.urihttp://hdl.handle.net/11449/37271-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/37271-
dc.description.abstractIn this paper, we report luminescent and morphological studies with yttrium oxide samples doped with ytterbium and erbium. The samples were prepared by the combustion method and also from different precursors: oxalate, basic carbonate and polymeric resin. All powders were identified Lis being an yttrium oxide with a C-form structure, independent of the employed precursor. From mean crystallite size measurements, it was verified that oxides prepared through the polymeric precursor and combustion methods lead to the smallest crystallite size. Particle shape and size were investigated by SEM and TEM, and showed that both the oxalate precursor and the combustion methods do not provide oxide materials of suitable shape or size, on the other hand. The basic carbonate and polymeric precursors resulted in spherically shaped particles with an average diameter of 90 and 15 run. respectively, Upon 980 run diode laser excitation, green and red emission lines were detected for all samples and were assigned to the H-2(11/2) S-4(3/2) -> I-4(15/2) and (4)Fg(9/2) -> 4I(15/12) transitions, respectively. Such transitions are characteristic for Er3+ and result from energy transfer from Yb3+ energy levels, F-2(7/2) -> F-2(5/2). A relationship between the decrease in the mean crystallite size and the enhancement in red emission was also established as well as the influence of the presence of a high percentage of Yb-3 Both factors promote ET from Yb3+ (F-2(5/2)) to Er3+ (I-4(11/2)). (c) 2004 Elsevier B.V. All rights reserved.en
dc.format.extent174-182-
dc.language.isoeng-
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.subjectup-conversionpt
dc.subjectrare earthpt
dc.subjectphosphorpt
dc.subjectUPTpt
dc.subjectnanoparticlespt
dc.titleMorphological and luminescent studies on nanosized Er, Yb-Yttrium oxide up-converter prepared from different precursorsen
dc.typeoutro-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv São Paulo, Dept Quim, FFCLRP, BR-14040901 Ribeirao Preto, Brazil-
dc.description.affiliationUniv Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.identifier.doi10.1016/j.jlumin.2004.09.122-
dc.identifier.wosWOS:000229877200002-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Luminescence-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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