Novel blue emitters based on pi-conjugated block copolymers

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dc.contributor.authorPeres, L. O. [UNIFESP]
dc.contributor.authorWang, S. H.
dc.contributor.authorWery, J.
dc.contributor.authorFroyer, G.
dc.contributor.authorFaulques, E.
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionInst Mat Jean Rouxel
dc.date.accessioned2016-01-24T13:52:20Z
dc.date.available2016-01-24T13:52:20Z
dc.date.issued2009-03-01
dc.description.abstractA series of new phenyl-based conjugated copolymers has been synthesized and investigated by vibrational and photoluminescence spectroscopy (PL). the materials are: poly( 1,4-phenylene-alt-3,6-pyridazine) (COP-PIR), poly(9,9-dioctylfluorene)-co-quaterphenylene (COP-PPP) and poly[(1,4-phenylene-alt-3,6-pyridazine)-co-(1,4-phenylene-alt-9,9-dioctylfluorene)] (COP-PIR-FLUOR), with 3.5% of fluorene. COP-PPP and COP-PIR-FLUOR have high fluorescence quantum yields in solution. Infrared and Raman spectra were used to check the chemical structure of the compounds. the copolymers exhibit blue emission ranging front 2.8 to 3.6 eV when excited at E(exc)=4.13 eV. Stokes-shift Values were estimated on pristine samples in their condensed state from steady-state PL-emission and PL-excitation spectra. They suggest a difference in the torsional angle between the molecular configuration of the polymer blocks at the absorption and PL transitions and also in the photoexcitation diffusion. Additionally, the time-resolved PL of these materials has been investigated by using 100 fs laser pulses at E(exc)=4.64 eV and a streak camera. Results show very fast biexponential kinetics for the two fluorene-based polymers with decay times below 300 ps indicating both intramolecular, fast radiative recombination and migration of photogenerated electron-hole pairs. By contrast, the PL of COP-PIR is less intense and longer lived, indicating that excitons are confined to the chains in this polymer. (C) 2008 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniversidade Federal de São Paulo, BR-09972270 Diadema, SP, Brazil
dc.description.affiliationUniv São Paulo, Dept Met & Mat Engn, Escola Politec, BR-05508900 São Paulo, Brazil
dc.description.affiliationInst Mat Jean Rouxel, F-44322 Nantes, France
dc.description.affiliationUnifespUniversidade Federal de São Paulo, BR-09972270 Diadema, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent372-376
dc.identifierhttp://dx.doi.org/10.1016/j.msec.2008.07.022
dc.identifier.citationMaterials Science & Engineering C-biomimetic and Supramolecular Systems. Amsterdam: Elsevier B.V., v. 29, n. 2, p. 372-376, 2009.
dc.identifier.doi10.1016/j.msec.2008.07.022
dc.identifier.issn0928-4931
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/31358
dc.identifier.wosWOS:000264694600005
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofMaterials Science & Engineering C-biomimetic and Supramolecular Systems
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.rights.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.subjectConjugated polymersen
dc.subjectFluoreneen
dc.subjectCopolymersen
dc.subjectVibrational spectroscopyen
dc.subjectPhotoluminescenceen
dc.subjectSuzuki reactionen
dc.titleNovel blue emitters based on pi-conjugated block copolymersen
dc.typeinfo:eu-repo/semantics/article
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