Local Er(III) environment in luminescent titanosilicates prepared from microporous precursors

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dc.contributor.authorRainho, J. P.
dc.contributor.authorPillinger, M.
dc.contributor.authorCarlos, L. D.
dc.contributor.authorRibeiro, SJL
dc.contributor.authorAlmeida, R. M.
dc.contributor.authorRocha, J.
dc.contributor.institutionUniv Aveiro
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionInst Super Tecn
dc.date.accessioned2014-05-20T15:22:20Z
dc.date.available2014-05-20T15:22:20Z
dc.date.issued2002-01-01
dc.description.abstractThe local environment of Er3+ ions in microporous titanosilicate ETS-10 and in synthetic narsarsukite and glassy materials obtained by calcination of ETS-10 has been investigated by EXAFS, Raman and photoluminescence spectroscopies. Er L-III-edge EXAFS studies of Er3+-doped ETS-10 support the view that the exchanged Er3+ ions reside close to the (negatively charged) TiO6 octahedra. In ETS-10, Er3+ is partially bonded to framework oxygen atoms and hydration water molecules. The Er...Ti distance (3.3 Angstrom) is similar to the Na...Ti distances (3.15-3.20 Angstrom) reported previously for Na-ETS-10. Although the exact location of the ErO6 units within the host structure of Er3+-doped synthetic narsarsukite is still an open question, it is most likely that Er3+ substitutes Ti4+ rather than Na+ ions. EXAFS spectroscopy indicates that no significant clustering of erbium atoms occurs in the titanosilicate samples studied. Evidence for the insertion of Er3+ ions in the framework of narsarsukite has been obtained by Raman spectroscopy. This is indicated by the increasing full-width at half-maximum (FWHM) of the 775 cm(-1) peak and the increasing intensity of the anatase peaks as the erbium content increases. In addition, as the narsarsukite Er3+ content increases a band at ca. 515 cm(-1) firstly broadens and subsequently a new peak appears at ca. 507 cm(-1).Er3+-doped narsarsukite exhibits a characteristic local vibrational frequency, (h) over bar omega ca. 330 cm(-1), with an electron-phonon coupling, g ca. 0.2, which constitutes additional evidence for framework Er3+ insertion. The number of lines in the infrared emission spectrum of synthetic narsarsukite indicates the presence of two optically-active erbium centres with very similar local environments and an average I-4(13/2) lifetime of 7.8 +/- 0.2 ms.en
dc.description.affiliationUniv Aveiro, Dept Chem, P-3810193 Aveiro, Portugal
dc.description.affiliationUniv Aveiro, Dept Phys, P-3810193 Aveiro, Portugal
dc.description.affiliationUNESP, Inst Quim, BR-14800900 Araraquara, Brazil
dc.description.affiliationInst Super Tecn, INESC ID, Dept Mat Engn, P-1000049 Lisbon, Portugal
dc.description.affiliationUnespUNESP, Inst Quim, BR-14800900 Araraquara, Brazil
dc.format.extent1162-1168
dc.identifierhttp://dx.doi.org/10.1039/b107136j
dc.identifier.citationJournal of Materials Chemistry. Cambridge: Royal Soc Chemistry, v. 12, n. 4, p. 1162-1168, 2002.
dc.identifier.doi10.1039/b107136j
dc.identifier.issn0959-9428
dc.identifier.urihttp://hdl.handle.net/11449/33343
dc.identifier.wosWOS:000174550000062
dc.language.isoeng
dc.publisherRoyal Soc Chemistry
dc.relation.ispartofJournal of Materials Chemistry
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleLocal Er(III) environment in luminescent titanosilicates prepared from microporous precursorsen
dc.typeArtigo
dcterms.licensehttp://www.rsc.org/AboutUs/Copyright/LicencetoPublishforjournals.asp
dcterms.rightsHolderRoyal Soc Chemistry
unesp.author.orcid0000-0002-8162-6747[4]
unesp.author.orcid0000-0002-6243-7692[2]
unesp.author.orcid0000-0003-2841-5921[5]
unesp.author.orcid0000-0002-0417-9402[6]
unesp.author.orcid0000-0003-4747-6535[3]
unesp.author.orcid0000-0003-3286-9440[4]

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