Eu(III) local coordination in white light emitters organic-inorganic hybrids.

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniv Aveiro-
Autor(es): dc.contributorUniv Tras Montes & Alto Douro-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorCarlos, L. D.-
Autor(es): dc.creatorFerreira, RAS-
Autor(es): dc.creatorBermudez, V. D.-
Autor(es): dc.creatorBueno, L. A.-
Autor(es): dc.creatorMolina, C.-
Autor(es): dc.creatorMessaddeq, Y.-
Autor(es): dc.creatorRibeiro, SJL-
Data de aceite: dc.date.accessioned2022-02-22T00:03:18Z-
Data de disponibilização: dc.date.available2022-02-22T00:03:18Z-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2020-12-09-
Data de envio: dc.date.issued2001-07-01-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/194562-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/194562-
Descrição: 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 A 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-4f(6), D-5(0)--> F-7(0-4) Eu3+ transitions and from the energy position of the F-7(0-4) 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.-
Descrição: dc.descriptionUniv Aveiro, Dept Fis, P-3810 Aveiro, Portugal-
Descrição: dc.descriptionUniv Tras Montes & Alto Douro, Dept Quim, P-5001 Vila Real Codex, Portugal-
Descrição: dc.descriptionUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
Descrição: dc.descriptionUNESP, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
Formato: dc.format453-459-
Idioma: dc.languagept_BR-
Publicador: dc.publisherSoc Brasileira Quimica-
Relação: dc.relationQuimica Nova-
???dc.source???: dc.sourceWeb of Science-
Palavras-chave: dc.subjectorganic-inorganic hybrids-
Palavras-chave: dc.subjectluminescence-
Palavras-chave: dc.subjectEXAFS-
Título: dc.titleEu(III) local coordination in white light emitters organic-inorganic hybrids.-
Tipo de arquivo: dc.typelivro digital-
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