Poly P Phenylene
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Electrical and optical numerical modeling of DP-PPV based polymer light emitting diode
Abstract In this paper, an in-depth study of the electrical and optical characteristics of Polymer Light Emitting Diodes ITO/PEDOT: PSS/DP-PPV derivatives/Al(Ca) is presented. Three polymer materials are considered; poly(2,3-diphenyl-5-(4-heptyloxy-4'-oxytrimethylenediphenyl)-phenylenevinylene) (P1), poly(2,3-diphenyl-5-[4-(4-pentylcyclohexyl)phenoxy]-propyl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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2. Effects from Gold Electrodes on the Electron-Phonon Coupling of Poly(p-phenylenevinylene) Films
Interface effects between metal electrodes and organic films are crucial for the overall performance of organic electronics devices. We investigate effects from gold electrodes deposited on spin-coated films of poly(p-phenylene vinylene) (PPV). While a thin Au layer (16 nm) did not affect the absorption and emission spectra of PPV, a 64 nm thick Au layer ind
J. Braz. Chem. Soc.. Publicado em: 2015-09
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3. Microstructural developments of poly (p-phenylene terephthalamide) fibers during heat treatment process: a review
Poly (p-phenylene terephthalamide) fibers prepared by wet or dry-jet wet spinning processes have a notable response to very brief heat treatment (seconds) under tension. The modulus of the as-spun fiber can be greatly affected by the heat treatment conditions (temperature, tension and duration). The crystallite orientation and the fiber modulus will increase
Mat. Res.. Publicado em: 09/09/2014
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4. Electrosynthesis and optical characterization of poly(p-phenylene), polypyrrole and poly(p-phenylene)-polypyrrole films
Poly(p-phenylene) (PPP), polypyrrole (PPY), and poly(p-phenylene-pyrrole) (PPP-PPY) films were electrochemically synthesized in acetronitrile by cyclic voltammetry. For comparison purposes, the films were characterized by cyclic voltammetry in a monomer-free solution, and their optical responses were also obtained in the UV-VIS range of energy after varying
Mat. Res.. Publicado em: 18/02/2014
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5. Aplicação da técnica de elipsometria de emissão para caracterização de materiais luminescentes
In this work we demonstrated the potential of the emission ellipsometry in the scope of the Stokes theory for electromagnetic field to the photophysics study of luminescent materials, in addition we introduce a new methodology using an achromatic quarter-wave plate. Moreover, the use of linearly polarized light allowed "selectively" the study of various phot
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/02/2012
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6. Desenvolvimento de uma metodologia de fabricação de transistores de filmes finos orgânicos. / Development of a manufacturing methodology for organic thin film transistors.
In this work, it is presented a methodology for organic thin-film transistor (OTFT) fabrication. Poly(3-hexylthyophene) (P3HT):[6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) bulk heterojunction solar cells were studied for their maximum power conversion efficiency (PCE) around 5 %. Efficiencies evolution in time from 10-6 to 1.7 % show the difficulties inv
Publicado em: 2010
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7. Influência da radiação gama em filmes de PPV e PTHT: caracterização óptica e elétrica
In this work, we investigated the effects of Gamma ionizing radiation on optical properties of the polyeletrolite poly (chloride Tetrahydrothiophen of xililideno) (PTHT) and the conjugated polymer poly(p- phenylene vinileno) (PPV). The PPV films were processed from PTHT films and it was submitted on the annealing step at low (110oC) and higher (200oC) under
Publicado em: 2009
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8. Photophysics in nanostructured films containing poly(p-phenylene vinylene) (PPV) and acceptor species. / Fotofísica em heteroestruturas contendo o polímero emissor PPV e espécies supressoras
A compreensão dos caminhos de desativação não radiativa em polímeros conjugados é fundamental para o uso desses materiais em dispositivos luminescentes, células fotovoltaicas e sensores. Nesta tese, os processos não radiativos em filmes automontados de polímero luminescente foram investigados via análise da supressão de intensidade de fotoluminesc
Publicado em: 2009
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9. Time resolved emission spectroscopy of poly(2,5-dicyano-p-phenylene-vinylene) films
Filmes finos de poli(2,5-diciano-p-fenileno vinileno), DCNPPV, foram produzidos por síntese eletroquímica com variação do potencial aplicado de-0,15 até-1,0 V, e depositados sobre camada fina de ouro sobre vidro. A cinética de estado excitado destes materiais foi investigada por medidas de decaimentos de fluorescência. Os filmes apresentam decaimentos
J. Braz. Chem. Soc.. Publicado em: 2008
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10. Efeito da fotocondução em diodos com camada ativa de derivados de poli(p-fenileno vinileno) (PPV) / Photoconduction effect in single layer diodes based on PPV derivatives.
This thesis is a study about photoconductivity in polymeric materials, in particular diodes with single-layer sandwich structure derivates of poly(para-phenylene vinylene) (PPV): OC10-PPV, SY and MEH-PPV. Different metallic electrodes were deposited on the same polymeric layer. Therefore, it was necessary to realize the devices fabrication process step by st
Publicado em: 2008
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11. Caracterização óptica e morfológica de filmes automontados de POMA/PPV
Neste trabalho apresentamos as caracterizações ópticas e morfológicas de filmes LBL (layer by layer) ultrafinos de poli(p-fenileno vinileno) (PPV) e poli(o-methoxianilina) (POMA). Os filmes de PPV foram processados usando o polímero precursor poli (cloreto de xilideno tetrahidrotiofeno) (PTHT) e o sódio dodecilbenzenosulfonado (DBS). Os filmes foram de
Publicado em: 2008
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12. CaracterizaÃÃo Ãptica e morfolÃgica de filmes automontados de POMA/PPV
Neste trabalho apresentamos as caracterizaÃÃes Ãpticas e morfolÃgicas de filmes LBL (layer by layer) ultrafinos de poli(p-fenileno vinileno) (PPV) e poli(o-methoxianilina) (POMA). Os filmes de PPV foram processados usando o polÃmero precursor poli (cloreto de xilideno tetrahidrotiofeno) (PTHT) e o sÃdio dodecilbenzenosulfonado (DBS). Os filmes foram de
Publicado em: 2008