Dynamics of singlet excitations in conjugated polymers: Poly(phenylenevinylene) and poly(phenylphenylenevinylene)

Mollay, B.; Lemmer, Uli; Kersting, R.; Mahrt, Rainer F.; Kurz, H.; Kauffmann, H. F.; Bäßler, H.

doi:10.1103/physrevb.50.10769

Cited by 97 publications

(96 citation statements)

References 37 publications

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“…17,[21][22][23][24][25][26][27] The Förster transfer rate is calculated by summing the dipole-dipole interactions between each individual pair of monomers on different spectroscopic units. The orientation and position of the single monomer within a spectroscopic unit is thus needed, even though the excitation is assumed to be delocalized over a spectroscopic unit.…”

Section: ͑1͒mentioning

confidence: 99%

Conformational disorder and energy migration in MEH-PPV with partially broken conjugation

Grage

Wood

Ruseckas

et al. 2003

The Journal of Chemical Physics

106

124

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Articles you may be interested inCorrelation between oxygen adsorption energy and electronic structure of transition metal macrocyclic complexes J. Chem. Phys. 139, 204306 (2013) In order to obtain a better understanding of the role of conformational disorder in the photophysics of conjugated polymers the ultrafast transient absorption anisotropy of partially deconjugated MEH-PPV has been measured. These data have been compared to the corresponding kinetics of Monte Carlo-simulated polymer chains, and estimates of the energy hopping time and energy migration distances for the polymers have been obtained. We find that the energy migration in the investigated MEH-PPV is approximately 3 times faster than in previously studied polythiophenes. We attribute this to a more disordered chain conformation in MEH-PPV.

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Section: ͑1͒mentioning

confidence: 99%

Conformational disorder and energy migration in MEH-PPV with partially broken conjugation

Grage

Wood

Ruseckas

et al. 2003

The Journal of Chemical Physics

106

124

View full text Add to dashboard Cite

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“…For -conjugated polymers the time-dependent shift of the luminescence spectrum ͑dynamic Stokes shift͒ has been modeled by assuming excitons localized on a few repeat units, which migrate spatially as well as energetically through Förster transfer. [21][22][23] It was concluded that the Stokes shift in these systems cannot be explained from nuclear displacements, as would be the case for single molecules, and that the migration process plays a crucial role. 21 Also for J aggregates, with strongly delocalized exciton states, the belief is that the Stokes shift induced by nuclear displacements is small, in fact much smaller than the Stokes shift of their single-molecule constituents.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature dynamics of weakly localized Frenkel excitons in disordered linear chains

Bednarz

Малышев

Knoester

2004

The Journal of Chemical Physics

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We calculate the temperature dependence of the fluorescence Stokes shift and the fluorescence decay time in linear Frenkel exciton systems resulting from the thermal redistribution of exciton population over the band states. The following factors, relevant to common experimental conditions, are accounted for in our kinetic model: ͑weak͒ localization of the exciton states by static disorder, coupling of the localized excitons to vibrations in the host medium, a possible nonequilibrium of the subsystem of localized Frenkel excitons on the time scale of the emission process, and different excitation conditions ͑resonant or nonresonant͒. A Pauli master equation, with microscopically calculated transition rates, is used to describe the redistribution of the exciton population over the manifold of localized exciton states. We find a counterintuitive nonmonotonic temperature dependence of the Stokes shift. In addition, we show that depending on experimental conditions, the observed fluorescence decay time may be determined by vibration-induced intraband relaxation, rather than radiative relaxation to the ground state. The model considered has relevance to a wide variety of materials, such as linear molecular aggregates, conjugated polymers, and polysilanes.

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“…Pode-se conseguir um aumento da condutividade do polímero pela dopagem com aceptores de elétrons, tais como iodo, FeCl 3 , SO 3 , AsF 5 , corantes catiônicos etc. ou doadores de elétrons como os metais alcalinos (33,43,51,(56)(57)(58)(59)(60) , corantes aniônicos etc.…”

Section: I13 -Poli(p-fenilenovinileno) -Ppvunclassified

“…A forma do decaimento do polímero para o estado fundamental é a mesma quando na presença dos diferentes corantes. Este decaimento é biexponencial para todas as análises de fluorescência resolvida no tempo, que corresponde a dois transientes diferentes, τ 1 e τ 2 , provenientes de duas estruturas conformacionais do polímero (48)(49)(50)(51) . conseqüentemente, maior valor do coeficiente angular da reta (K sv ).…”

Section: Iv23 -Estudo Da Supressão Via Mecanismo De Försterunclassified

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Estudo de transferência de energia eletrônica entre poli(p-fenilenovinileno) e corantes iônicos em solução

Santos¹

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2007ii "Pegue um raio de sol e faça-o voar lá onde reina a noite. Pegue um sorriso e doe-o a quem jamais o teve. Descubra a fonte e faça banhar-se quem vive no lodo. Pegue uma lágrima e ponha-a no rosto de quem jamais chorou. Pegue a coragem e ponha-a no ânimo de quem não sabe lutar. Descubra a vida e narrea-a a quem não sabe entendê-la. Pegue a esperança e viva na sua luz. Pegue a bondade e doe-a a quem não sabe doar. Descubra o amor e faça-o conhecer o mundo." Mahatma GandhiAos meus pais, Adão e PenhaPor todo amor e dedicação. Minhas irmãs, Kênia e LhannaSem elas eu não seria a pessoa que sou. AgradecimentosAo prof. Dr. Miguel Neumann pela orientação e paciência.À amiga Dra Carla Cristina Cavalheiro pelo apoio técnico e compreensão nos momentos difíceis.À amiga Alessandra pela paciência, apoio técnico e ajuda na correção da dissertação.À Emanuelle pela ajuda importantíssima nos resultados de fluorescência resolvida no tempo.À minha Família que mesmo longe está ao meu lado.À Ana Paula pelo amor que tanto me motiva. ABSTRACTThe aim of this work was to study the photochemical synthesis of poly(p-

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Dynamics of singlet excitations in conjugated polymers: Poly(phenylenevinylene) and poly(phenylphenylenevinylene)

Cited by 97 publications

References 37 publications

Conformational disorder and energy migration in MEH-PPV with partially broken conjugation

Conformational disorder and energy migration in MEH-PPV with partially broken conjugation

Low-temperature dynamics of weakly localized Frenkel excitons in disordered linear chains

Estudo de transferência de energia eletrônica entre poli(p-fenilenovinileno) e corantes iônicos em solução

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