You are in the accessibility menu

Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorMolina, C.-
dc.contributor.authorDahmouche, K.-
dc.contributor.authorMessaddeq, Younes-
dc.contributor.authorRibeiro, SJL-
dc.contributor.authorSilva, MAP-
dc.contributor.authorBermudez, V. D.-
dc.contributor.authorCarlos, L. D.-
dc.identifier.citationJournal of Luminescence. Amsterdam: Elsevier B.V., v. 104, n. 1-2, p. 93-101, 2003.-
dc.description.abstractOrganic-inorganic hybrids, named di-ureasils and described by polyether-based chains grafted to both ends to a siliceous backbone through urea cross linkages, were used as hosts for incorporation of the well-known coordination complex of trivalent europium (Eu3+) ions described by the formula [Eu(TTA)(3)(H2O)(2)] (where TTA stands for thenoyltrifluoroacetone). By comparing with Eu3+-doped di-ureasil without complex form the new materials prepared here enhanced the quantum efficiency for photoemission of Eu3+ ions. The enhancement can be explained by the coordination ability of the organic counterpart of the host structure which is strong enough to displace water molecules in [Eu(TTA)(3)(H2O)(2)] from the rare earth neighbourhood after the incorporation process. High intensity of Eu3+ emission was observed with a low non-radiative decay rate under ultraviolet excitation. The quantum efficiency calculated from the decay of D-5(0) emission was 74%, which in the same range of values previously obtained for the most efficient Eu3+ coordination compounds reported in literature. Luminescence, X-ray absorption and infrared absorption results considered together leads to a picture where the first coordination shell of Eu3+ is composed of the 6 oxygen atoms of the 3 beta-diketonate ligands and 2 ether-like oxygen atoms of the host. (C) 2003 Elsevier B.V. B.V. All rights reserved.en
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.subjectorganic-inorganic hybridspt
dc.subjecteuropium (III)pt
dc.titleEnhanced emission from Eu(III) beta-diketone complex combined with ether-type oxygen atoms of di-ureasil organic-inorganic hybridsen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniv Angers-
dc.contributor.institutionUniv Tras Os Montes & Alto Douro-
dc.contributor.institutionUniv Aveiro-
dc.description.affiliationUNESP, Inst Chem, BR-14801970 Araraquara, SP, Brazil-
dc.description.affiliationUniv Angers, CNRS, UMR 6136, Lab POMA, F-49045 Angers, France-
dc.description.affiliationUniv Tras Os Montes & Alto Douro, Dept Quim, P-5001911 Vila Real, Portugal-
dc.description.affiliationUniv Aveiro, Dept Fis, P-3810 Aveiro, Portugal-
dc.description.affiliationUnespUNESP, Inst Chem, BR-14801970 Araraquara, SP, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Luminescence-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.