Triplet state dynamics in poly(2,5-pyridine diyl)
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/5231 https://doi.org/10.1016/S0379-6779(00)00505-1 |
Resumo: | Pulse 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. |
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Triplet state dynamics in poly(2,5-pyridine diyl)Poly(2,5-pyridine diyl)Triplet state energyPPY filmsTime-resolved photoluminescencePulse 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.http://www.sciencedirect.com/science/article/B6TY7-41XMFCG-6/1/e8eb864b0a7e6582ef22a9cc934d62d42001info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/5231http://hdl.handle.net/10316/5231https://doi.org/10.1016/S0379-6779(00)00505-1engSynthetic Metals. 116:1-3 (2001) 15-18Wong, K. S.Law, Carrie W. Y.Sun, T.Monkman, A. P.Vaschetto, M. E.Hartwell, L. J.Horsburgh, L. E.Burrows, H. D.Miguel, M. da G.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-05-25T07:53:03Zoai:estudogeral.uc.pt:10316/5231Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:01:22.459396Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Triplet state dynamics in poly(2,5-pyridine diyl) |
title |
Triplet state dynamics in poly(2,5-pyridine diyl) |
spellingShingle |
Triplet state dynamics in poly(2,5-pyridine diyl) Wong, K. S. Poly(2,5-pyridine diyl) Triplet state energy PPY films Time-resolved photoluminescence |
title_short |
Triplet state dynamics in poly(2,5-pyridine diyl) |
title_full |
Triplet state dynamics in poly(2,5-pyridine diyl) |
title_fullStr |
Triplet state dynamics in poly(2,5-pyridine diyl) |
title_full_unstemmed |
Triplet state dynamics in poly(2,5-pyridine diyl) |
title_sort |
Triplet state dynamics in poly(2,5-pyridine diyl) |
author |
Wong, K. S. |
author_facet |
Wong, K. S. Law, Carrie W. Y. Sun, T. Monkman, A. P. Vaschetto, M. E. Hartwell, L. J. Horsburgh, L. E. Burrows, H. D. Miguel, M. da G. |
author_role |
author |
author2 |
Law, Carrie W. Y. Sun, T. Monkman, A. P. Vaschetto, M. E. Hartwell, L. J. Horsburgh, L. E. Burrows, H. D. Miguel, M. da G. |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Wong, K. S. Law, Carrie W. Y. Sun, T. Monkman, A. P. Vaschetto, M. E. Hartwell, L. J. Horsburgh, L. E. Burrows, H. D. Miguel, M. da G. |
dc.subject.por.fl_str_mv |
Poly(2,5-pyridine diyl) Triplet state energy PPY films Time-resolved photoluminescence |
topic |
Poly(2,5-pyridine diyl) Triplet state energy PPY films Time-resolved photoluminescence |
description |
Pulse 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. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/5231 http://hdl.handle.net/10316/5231 https://doi.org/10.1016/S0379-6779(00)00505-1 |
url |
http://hdl.handle.net/10316/5231 https://doi.org/10.1016/S0379-6779(00)00505-1 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Synthetic Metals. 116:1-3 (2001) 15-18 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
aplication/PDF |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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