Color tunability of intense upconversion emission from Er3+-Yb3+ co-doped SiO2-Ta2O5 glass ceramic planar waveguides

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dc.contributor.authorFerrari, Jefferson Luis
dc.contributor.authorLima, Karmel de Oliveira
dc.contributor.authorPecoraro, Édison [UNESP]
dc.contributor.authorFerreira, Rute A. S.
dc.contributor.authorCarlos, Luis D.
dc.contributor.authorGoncalves, Rogeria Rocha
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São João del-Rei (UFSJ)
dc.contributor.institutionUniv Aveiro
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:20:19Z
dc.date.available2014-05-20T14:20:19Z
dc.date.issued2012-01-01
dc.description.abstractThis work reports on the infrared-to-visible CW frequency upconversion from planar waveguides based on Er3+-Yb3+-doped 100-xSiO(2)-xTa(2)O(5) obtained by a sol-gel process and deposited onto a SiO2-Si substrate by dip-coating. Surface morphology and optical parameters of the planar waveguides were analyzed by atomic force microscopy and the m-line technique. The influence of the composition on the electronic properties of the glass-ceramic films was followed by the band gap ranging from 4.35 to 4.51 eV upon modification of the Ta2O5 content. Intense green and red emissions were detected from the upconversion process for all the samples after excitation at 980 nm. The relative intensities of the emission bands around 550 nm and 665 nm, assigned to the H-2(11/2) -> I-4(15/2), S-4(3/2) -> I-4(15/2), and F-4(9/2) -> I-4(15/2) transitions, depended on the tantalum oxide content and the power of the laser source at 980 nm. The upconversion dynamics were investigated as a function of the Ta2O5 content and the number of photons involved in each emission process. Based on the upconversion emission spectra and 1931CIE chromaticity diagram, it is shown that color can be tailored by composition and pump power. The glass ceramic films are attractive materials for application in upconversion lasers and near infrared-to-visible upconverters in solar cells.en
dc.description.affiliationUniv São Paulo, Dept Quim, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Ribeirao Preto, SP, Brazil
dc.description.affiliationUniv Fed Sao Joao Del Rei, GPQM, Dept Ciencias Nat, BR-36301160 Sao Joao Del Rei, MG, Brazil
dc.description.affiliationUniv Aveiro, Dept Phys, P-3810193 Aveiro, Portugal
dc.description.affiliationUniv Aveiro, CICECO, P-3810193 Aveiro, Portugal
dc.description.affiliationUNESP, Lab Mat Foton, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Lab Mat Foton, Inst Quim, BR-14801970 Araraquara, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent9901-9908
dc.identifierhttp://dx.doi.org/10.1039/c2jm30456b
dc.identifier.citationJournal of Materials Chemistry. Cambridge: Royal Soc Chemistry, v. 22, n. 19, p. 9901-9908, 2012.
dc.identifier.doi10.1039/c2jm30456b
dc.identifier.issn0959-9428
dc.identifier.lattes528258491277437
dc.identifier.orcid0000-0002-5049-8797
dc.identifier.urihttp://hdl.handle.net/11449/26108
dc.identifier.wosWOS:000303207100069
dc.language.isoeng
dc.publisherRoyal Soc Chemistry
dc.relation.ispartofJournal of Materials Chemistry
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleColor tunability of intense upconversion emission from Er3+-Yb3+ co-doped SiO2-Ta2O5 glass ceramic planar waveguidesen
dc.typeArtigo
dcterms.licensehttp://www.rsc.org/Publishing/librarians/AuthorDeposition.asp
dcterms.rightsHolderRoyal Soc Chemistry
unesp.author.lattes528258491277437[3]
unesp.author.orcid0000-0002-5049-8797[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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