Coordenação local do Eu(III) em híbridos orgânicos/inorgânicos emissores de luz branca

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCarlos, Luís D.
dc.creatorFerreira, Rute A. Sá
dc.creatorZéa Bermudez, Verónica de
dc.creatorBueno, Luciano A.
dc.creatorMolina, Celso
dc.creatorMessaddeq, Younes
dc.creatorRibeiro, Sidney José Lima
dc.date2014-05-20T15:10:18Z
dc.date2016-10-25T17:44:42Z
dc.date2014-05-20T15:10:18Z
dc.date2016-10-25T17:44:42Z
dc.date2001-08-01
dc.date.accessioned2017-04-05T22:48:33Z
dc.date.available2017-04-05T22:48:33Z
dc.identifierQuímica Nova. Sociedade Brasileira de Química, v. 24, n. 4, p. 453-459, 2001.
dc.identifier0100-4042
dc.identifierhttp://hdl.handle.net/11449/27574
dc.identifierhttp://acervodigital.unesp.br/handle/11449/27574
dc.identifier10.1590/S0100-40422001000400005
dc.identifierS0100-40422001000400005
dc.identifierS0100-40422001000400005.pdf
dc.identifierhttp://dx.doi.org/10.1590/S0100-40422001000400005
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/872267
dc.descriptionEu3+ luminescence and EXAFS (Extended X-ray Absorption Fine Structure) results are presented for organic-inorganic hybrid gel hosts composed of a siliceous network to which small chains of oxyethylene units are covalently grafted by means of urea bridges. Coordination numbers for Eu3+ ions range from 12.8 to 9.7 with increasing Eu3+ concentration while the Eu3+-first neighbours mean distance is found to be constant at 2.48-2.49 Å in the same concentration range. Emission spectra display a broad band in the green/blue spectral region superposed to narrow lines appearing in the yellow/red region in such a way that for the eyes emission appears white. The broad band is assigned to intrinsic NH groups emission and also to electron-hole recombination in the nanosised siliceous domains. The narrow lines are assigned to intra-4f6, 5D0->7F0-4 Eu3+ transitions and from the energy position of the 7F0-4 levels a mean distance could be calculated for the Eu3+-first neighbours. The calculated results are in good agreement with the experimental ones obtained from EXAFS analysis.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languagepor
dc.publisherSociedade Brasileira de Química
dc.relationQuímica Nova
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectorganic-inorganic hybrids
dc.subjectluminescence
dc.subjectEXAFS
dc.titleCoordenação local do Eu(III) em híbridos orgânicos/inorgânicos emissores de luz branca
dc.typeOtro


Este ítem pertenece a la siguiente institución