Er(3+)-Based Diureasil Organic-Inorganic Hybrids

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dc.contributor.authorMolina, C.
dc.contributor.authorFerreira, R. A. S.
dc.contributor.authorPoirier, G.
dc.contributor.authorFu, Lianshe
dc.contributor.authorRibeiro, Sidney José Lima [UNESP]
dc.contributor.authorMesssaddeq, Y. [UNESP]
dc.contributor.authorCarlos, L. D.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Alfenas (UNIFAL)
dc.contributor.institutionCENPRA
dc.contributor.institutionUniv Aveiro
dc.date.accessioned2014-05-20T15:32:42Z
dc.date.available2014-05-20T15:32:42Z
dc.date.issued2008-12-11
dc.description.abstractErbium-doped organic-inorganic hybrids derived from different carboxylic acids (acetic, formic, and valeric) solvolysis have been prepared and characterized. The hybrid matrix (named as diureasil) is composed of a siliceous network grafted to both ends of a polymer chain containing about 8.5 oxyethylene units. Er(3+) ions have been incorporated as erbium triflate salt, Er(CF(3)SO(3))(3), with n = 5, 10, and 20, where n denotes the ratio of (OCH(2)CH(2)) moieties of the hybrid organic counterpart per Er(3+) ion. Characterization techniques include X-ray absorption (EXAFS) at the Er L(III)-edge, Fourier transform infrared spectroscopy (FT-IR) and photoluminescence. FT-IR studies reveal that both free and coordinated triflate ions exist in the hybrids, independently of the carboxylic acid used. Moreover, the "amide I" and "amide H" infrared spectral regions are deeply affected suggesting that the Er(3+) ions interact with the carbonyl groups of the diureasil matrix. EXAFS results show that the Er(3+) first coordination shell is composed by 10-11 oxygen atoms at an average distance of 2.30-2.32 angstrom. The Omega lambda (lambda == 2,4,6) intensity parameters were evaluated from absorption measurements together with the Er(3+) (4)I(13/2) state radiative lifetime (tau(RAD)) and the peak emission cross section (sigma(EM)). Values obtained were Omega(2) = 12.3 x 10(-20) cm(2), Omega(4) = 5.56 x 10(-20) cm(2) and Omega(6) = 3.56 x 10(-21) cm(2), TRAD = 3.6 ms and 9 sigma(EM)(1537 nm) = 1.0 X 10(-20) cm(2). The host characteristic broad emission band in the visible and the Er(3+) emission at 1.5 mu m were discerned. Bandwidth of similar to 78 nm is observed for the latter emission which, together with the Omega(lambda), tau(RAD), and sigma(EM) spectroscopic parameters, denote the potential application of these hybrids in optical amplification devices.en
dc.description.affiliationSão Paulo State Univ, Inst Chem, UNESP, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUNIFAL, Dept Ciencias Exatas, BR-37130000 Alfenas, MG, Brazil
dc.description.affiliationCENPRA, Ctr Pesquisas Renato Archer, BR-13069901 Campinas, SP, Brazil
dc.description.affiliationUniv Aveiro, Dept Phys, CICECO, P-3810193 Aveiro, Portugal
dc.description.affiliationUnespSão Paulo State Univ, Inst Chem, UNESP, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipFEDER
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFCT: CTM/59075/04)
dc.format.extent19346-19352
dc.identifierhttp://dx.doi.org/10.1021/jp805777j
dc.identifier.citationJournal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 112, n. 49, p. 19346-19352, 2008.
dc.identifier.doi10.1021/jp805777j
dc.identifier.issn1932-7447
dc.identifier.lattes6446047463034654
dc.identifier.orcid0000-0003-3286-9440
dc.identifier.urihttp://hdl.handle.net/11449/41543
dc.identifier.wosWOS:000261426600028
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofJournal of Physical Chemistry C
dc.relation.ispartofjcr4.484
dc.relation.ispartofsjr2,135
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleEr(3+)-Based Diureasil Organic-Inorganic Hybridsen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/page/copyright/journals/faqs.html
dcterms.rightsHolderAmer Chemical Soc
unesp.author.lattes6446047463034654
unesp.author.orcid0000-0003-3286-9440[5]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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Artigos - Química Inorgânica - IQ