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dc.contributor.authorOlivati, Clarissa A.-
dc.contributor.authorFerreira, Marystela-
dc.contributor.authorMachado, Angelita M.-
dc.contributor.authorAkcelrud, Leni-
dc.contributor.authorOliveira Jr., Osvaldo N.-
dc.contributor.authorGiacometti, José A.-
dc.identifier.citationProceedings - International Symposium on Electrets, v. 2005, p. 438-440.-
dc.description.abstractPolyfluorenes are promising materials for the emitting layer of polymer light emitting devices (PLEDs) with blue emission. In this work, we report on PLEDs fabricated with Langmuir-Blodgett (LB) films of a polyfluorene derivative, namely poly(9,9-di-hexylfluorenediyl vinylene-alt-1,4-phenylenevinylene) (PDHF-PV). Y-type LB films were transferred onto ITO substrates at a surface pressure of 35 mN m-1 and with dipping speed of 3 mm min -1. A thin aluminum layer was evaporated on top of the LB film, thus yielding a sandwich structure (ITO/PDHF-PV(LB)/Al). Current-voltage (I vs V) measurements indicate that the device displays a classical behavior of a rectifying diode. The threshold value is approximately 5 V, and the onset for visible light emission occurs at ca. 10 V. From the a.c. electrical responses we infer that the active layer has a typical behavior of PLEDs where the real component of ac conductivity obeys a power-law with the frequency. Cole-Cole plots (Im(Z) vs. Re(Z)) for the device exhibit a series of semicircles, the diameter of which decreases with increasing forward bias. This PLED structure is modeled by a parallel resistance and capacitance combination, representing the dominant mechanisms of charge transport and polarization in the organic layer, in series with a resistance representing the ITO contact. Overall, the results presented here demonstrate the feasibility of LEDs made with LB films of PDHF-PV.en
dc.subjectLangmuir Blodgett films-
dc.subjectLight emitting diodes-
dc.subjectPolymer films-
dc.subjectSandwich structures-
dc.subjectBlue emissions-
dc.subjectPolyfluorene derivative-
dc.subjectPolymer light emitting devices (PLED)-
dc.subjectSurface pressure-
dc.subjectInorganic polymers-
dc.titlePolymer light emitting devices with Langmuir Blodgett (LB) films of a polyfluorene derivativeen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationFaculdade de Ciências e Tecnologia Unesp, CP 467, 19060-900, Presidente Prudente/SP-
dc.description.affiliationUFPR Depto. Química, CP 19081, 81531-900, Curitiba/PR-
dc.description.affiliationIFSC USP, CP 369, 13590-580, São Carlos/SP-
dc.description.affiliationUnespFaculdade de Ciências e Tecnologia Unesp, CP 467, 19060-900, Presidente Prudente/SP-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofProceedings - International Symposium on Electrets-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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