Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5231
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dc.contributor.authorWong, K. S.-
dc.contributor.authorLaw, Carrie W. Y.-
dc.contributor.authorSun, T.-
dc.contributor.authorMonkman, A. P.-
dc.contributor.authorVaschetto, M. E.-
dc.contributor.authorHartwell, L. J.-
dc.contributor.authorHorsburgh, L. E.-
dc.contributor.authorBurrows, H. D.-
dc.contributor.authorMiguel, M. da G.-
dc.date.accessioned2008-09-01T15:06:11Z-
dc.date.available2008-09-01T15:06:11Z-
dc.date.issued2001en_US
dc.identifier.citationSynthetic Metals. 116:1-3 (2001) 15-18en_US
dc.identifier.urihttp://hdl.handle.net/10316/5231-
dc.description.abstractPulse radiolysis was used to determine the triplet state energy (2.3 eV) of Poly(2,5-pyridine diyl) (PPY) film which was found to be coincident with the emission energy. Detailed time-resolved photoluminescence (PL) and pump-probe measurements have been applied to study the photoexcited state relaxation dynamics. In films, a very large spectral red-shift (~0.35 eV) for the PL occurred within the first 100 ps whereas no spectral red-shift was observed for the PPY in solution. This result shows clear evidence for the evolution of short-lived singlet emission (S1-->S0) at ~450 nm to long-lived triplet emission (T1-->S0) at ~520 nm for the PPY thin film. Streak camera measurement indicates the long live component has a decay time constant of several ns. The picosecond photo-induced triplet state absorption (T1-->T2 transition) peaks at ~600 nm as measured by pump-probe which is consistent with both the radiolysis and cw photo-induced absorption measurements. A triplet lifetime of ~6 ns is measured which is again consistent with the streak camera measurement. These results lead us to believe that the long live component of the emission from PPY film is in fact phosphorescence. Furthermore, there is evidence that oxygen plays a very important role in the fast triplet radiative lifetime in PPY films.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6TY7-41XMFCG-6/1/e8eb864b0a7e6582ef22a9cc934d62d4en_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPoly(2,5-pyridine diyl)en_US
dc.subjectTriplet state energyen_US
dc.subjectPPY filmsen_US
dc.subjectTime-resolved photoluminescenceen_US
dc.titleTriplet state dynamics in poly(2,5-pyridine diyl)en_US
dc.typearticleen_US
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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