Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5067
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dc.contributor.authorMelo, J. Seixas de-
dc.contributor.authorPina, J.-
dc.contributor.authorBurrows, H. D.-
dc.contributor.authorDi Paolo, R. E.-
dc.contributor.authorMaçanita, A. L.-
dc.date.accessioned2008-09-01T15:03:23Z-
dc.date.available2008-09-01T15:03:23Z-
dc.date.issued2006en_US
dc.identifier.citationChemical Physics. 330:3 (2006) 449-456en_US
dc.identifier.urihttp://hdl.handle.net/10316/5067-
dc.description.abstractA comprehensive photophysical and spectroscopic study of a new class of p-phenylenevinylene oligomers (PPV-trimers) possessing different alkyl and alkyloxy sidechain substituents and different end groups (aldehyde, CC, phenylene and anthracene units) was undertaken in solution at room temperature (293 K), low temperature (77 K) and in thin films. The study comprises absorption, emission and triplet-triplet absorption spectra, together with quantitative measurements of quantum yields (fluorescence, intersystem crossing, internal conversion and singlet oxygen formation) and lifetimes. The data allow the determination of rate constants for all decay processes. From these, several conclusions could be drawn. Changing from alkyl to alkyloxy substituents does not change fluorescence and internal conversion yields but decreases the (already small) intersystem crossing yield. The introduction of anthracene at the terminal ends of the PPV-trimers leads to the lowest fluorescence yield reported in this study. Of particular importance is the fact that the fluorescence quantum yields in films are of the same order of magnitude as those in solution, which suggests the potential for use of these oligomers for light-emitting device applications. With one of the alkyloxy derivatives, a more detailed study of the early part of the fluorescence decay was made, and it was found that upon excitation a fast conformational relaxation process of the initially excited oligomer occurs, leading to a more planar conjugation segment.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6TFM-4KXWDH3-1/1/7fda7eda4dc250233a3c905cd185f89cen_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPhotophysicsen_US
dc.subjectConjugated polymers and oligomers, PPVen_US
dc.subjectSinglet and triplet stateen_US
dc.subjectFluorescenceen_US
dc.subjectQuantum yieldsen_US
dc.subjectRate constantsen_US
dc.subjectPhenylenevinyleneen_US
dc.titleElectronic spectral and photophysical properties of some p-phenylenevinylene oligomers in solution and thin filmsen_US
dc.typearticleen_US
dc.identifier.doi10.1016/j.chemphys.2006.09.016-
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0001-9708-5079-
crisitem.author.orcid0000-0003-1848-1167-
crisitem.author.orcid0000-0003-3127-2298-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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