dc.contributor | Universidade Estadual Paulista (UNESP) | |
dc.creator | Olivati, Clarissa A. | |
dc.creator | Ferreira, Marystela | |
dc.creator | Machado, Angelita M. | |
dc.creator | Akcelrud, Leni | |
dc.creator | Oliveira Jr., Osvaldo N. | |
dc.creator | Giacometti, José A. | |
dc.date | 2014-05-27T11:21:42Z | |
dc.date | 2016-10-25T18:21:25Z | |
dc.date | 2014-05-27T11:21:42Z | |
dc.date | 2016-10-25T18:21:25Z | |
dc.date | 2005-12-01 | |
dc.date.accessioned | 2017-04-06T01:15:45Z | |
dc.date.available | 2017-04-06T01:15:45Z | |
dc.identifier | Proceedings - International Symposium on Electrets, v. 2005, p. 438-440. | |
dc.identifier | http://hdl.handle.net/11449/68536 | |
dc.identifier | http://acervodigital.unesp.br/handle/11449/68536 | |
dc.identifier | 10.1109/ISE.2005.1612418 | |
dc.identifier | WOS:000236764500115 | |
dc.identifier | 2-s2.0-33847742981 | |
dc.identifier | http://dx.doi.org/10.1109/ISE.2005.1612418 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/889868 | |
dc.description | Polyfluorenes 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. | |
dc.language | eng | |
dc.relation | Proceedings - International Symposium on Electrets | |
dc.rights | info:eu-repo/semantics/closedAccess | |
dc.subject | Derivatives | |
dc.subject | Langmuir Blodgett films | |
dc.subject | Light emitting diodes | |
dc.subject | Polymer films | |
dc.subject | Sandwich structures | |
dc.subject | Substrates | |
dc.subject | Blue emissions | |
dc.subject | Polyfluorene derivative | |
dc.subject | Polymer light emitting devices (PLED) | |
dc.subject | Surface pressure | |
dc.subject | Inorganic polymers | |
dc.title | Polymer light emitting devices with Langmuir Blodgett (LB) films of a polyfluorene derivative | |
dc.type | Otro | |