Controlling the absorption and emission properties of polyparaphenylenevinylene films
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2008
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Resumo |
In this work we used the conversion process of a precursor polymer into polyparaphenylenevinylene (PPV) at low temperatures in order to control the effective conjugation degree of spin-casted PPV films. The absorption and emission spectra of the films were studied by following a partial substitution of chloride counterions from poly(xylylidene tetrahydrothiophenium chloride) (PTHT), used as a precursor, by sodium acid dodecyl benzenesulfonate (DBS), added as a surfactant salt. Upon controlling the DBS amount and conversion temperature (T-c) of PTHT/DBS to PPV films, the band gap of PPV changed from 409 to 506 nm, and 505 to 532 nm, values obtained from absorbance and emission measurements, respectively. Based on these experimental data, we proposed a physical model which represents the chemical structure of PPV as a distribution of conjugated chain segments (like oligomers) alternated by non-conjugated segments (structural defects and/or from the precursor polymer). (C) 2008 Elsevier B.V. All rights reserved. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP FAPEMIG Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) CAPES Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) MCF/IMMP MCF/IMMP Fundacao para a Ciencia e a Tecnologia (FCT), Portugal Fundcao para a Ciencia e Tecnologia (Portugal)[POCTI/FAT/47529/2002] |
Identificador |
JOURNAL OF NON-CRYSTALLINE SOLIDS, v.354, n.42-44, p.4856-4859, 2008 0022-3093 http://producao.usp.br/handle/BDPI/29759 10.1016/j.jnoncrysol.2008.04.049 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE BV |
Relação |
Journal of Non-crystalline Solids |
Direitos |
restrictedAccess Copyright ELSEVIER SCIENCE BV |
Palavras-Chave | #Optical properties #Absorption #Luminescence #POLY(P-PHENYLENE VINYLENE) #TEMPERATURE #SPECTRA #Materials Science, Ceramics #Materials Science, Multidisciplinary |
Tipo |
article original article publishedVersion |