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Magnetic field effects in Alq3-based OLEDs investigated by electrical impedance spectroscopy

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dc.contributor.authorNunes-Neto, Oswaldo [UNESP]
dc.contributor.authorBatagin-Neto, Augusto [UNESP]
dc.contributor.authorLeite, Douglas M.G.
dc.contributor.authorNüesch, Frank A.
dc.contributor.authorGraeff, Carlos F.O. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionDepartamento de Física
dc.contributor.institutionSwiss Federal Laboratories for Materials Science and Technology
dc.date.accessioned2018-12-11T17:14:05Z
dc.date.available2018-12-11T17:14:05Z
dc.date.issued2017-11-01
dc.description.abstractThe effect of an external magnetic field on electrical impedance was measured on tris-(8-hydroxyquinoline) aluminum (Alq3) based OLEDs at different temperatures. Magnetic field effects (MFEs) were responsible for significant changes on the real and imaginary components of the impedance, and for the intensification of the negative capacitance (NC) effect. The observed MFEs do not present a strong temperature dependence. Simulations via equivalent circuits and numerical solutions of Boltzmann transport equations in a drift-diffusion approximation and employing small sinusoidal signal analysis indicate that such effects are consistent with an enhancement of the carrier mobilities and a quenching of the recombination rates. Such changes lead to reduced resistance and more intense NC effects on the device. The results were interpreted in terms of the currently accepted OMAR models: electron-hole pair model, triplet-polaron reaction mechanism and bipolaron model.en
dc.description.affiliationUniversidade Estadual Paulista (UNESP) POSMAT - Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências
dc.description.affiliationUniversidade Estadual Paulista (UNESP) Câmpus Experimental de Itapeva
dc.description.affiliationInstituto Tecnológico de Aeronáutica Divisão de Ciências Fundamentais Departamento de Física Campus CTA
dc.description.affiliationEMPA Laboratory for Functional Polymers Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129
dc.description.affiliationUniversidade Estadual Paulista (UNESP) Faculdade de Ciências
dc.description.affiliationUnespUniversidade Estadual Paulista (UNESP) POSMAT - Programa de Pós-Graduação em Ciência e Tecnologia de Materiais Faculdade de Ciências
dc.description.affiliationUnespUniversidade Estadual Paulista (UNESP) Câmpus Experimental de Itapeva
dc.description.affiliationUnespUniversidade Estadual Paulista (UNESP) Faculdade de Ciências
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCAPES: 1804-12-0
dc.description.sponsorshipIdFAPESP: 2008/57872-1 INCTMN
dc.description.sponsorshipIdFAPESP: 2011/21830-6
dc.description.sponsorshipIdFAPESP: 2012/03116-7
dc.description.sponsorshipIdCAPES: 23038.008351/2010-17
dc.description.sponsorshipIdCNPq: 448310/2014-7
dc.format.extent347-358
dc.identifierhttp://dx.doi.org/10.1016/j.orgel.2017.08.003
dc.identifier.citationOrganic Electronics: physics, materials, applications, v. 50, p. 347-358.
dc.identifier.doi10.1016/j.orgel.2017.08.003
dc.identifier.file2-s2.0-85027887544.pdf
dc.identifier.issn1566-1199
dc.identifier.scopus2-s2.0-85027887544
dc.identifier.urihttp://hdl.handle.net/11449/175068
dc.language.isoeng
dc.relation.ispartofOrganic Electronics: physics, materials, applications
dc.relation.ispartofsjr1,085
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectDrift-diffusion approach
dc.subjectMagneto-impedance
dc.subjectOrganic light emitting diodes
dc.titleMagnetic field effects in Alq3-based OLEDs investigated by electrical impedance spectroscopyen
dc.typeArtigo
dspace.entity.typePublication
unesp.author.lattes2813393825580000[2]
unesp.author.lattes5268607684223281[5]
unesp.author.orcid000-0003-4609-9002[2]
unesp.author.orcid0000-0003-0162-8273[5]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Ciências e Engenharia, Itapevapt
unesp.departmentEngenharia Industrial Madeireira - ICEpt

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