Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films

Shaw, Paul E.; Ruseckas, Arvydas; Samuel, Ifor D. W.

doi:10.1103/physrevb.78.245201

Cited by 35 publications

(44 citation statements)

References 21 publications

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“…5(a); k 3 is nearly constant independent of R. Usually, the energy transfer rate because of the point-to-point interaction described by the Förster model is proportional to R −6 . 30,33 Moreover, in bilayer structures, the rate because of the plane-to-plane interaction is known to be proportional to R −4 . 32,35 Therefore, the energy transfer is not the major factor for the fast response.…”

Section: -6mentioning

confidence: 99%

“…The resonant energy transfer was focused on as a method for increasing the decay rate, [30][31][32][33][34][35][36] in particular, on the cyanine molecule thin films. 37,38 The energy transfer causes ultrafast relaxation of the lowest excited states with a decrease in the distance between the energy donor and the acceptor molecules, which enables high repetition operation without the pattern effect.…”

Section: Introductionmentioning

confidence: 99%

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Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

2016

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Increase in exciton decay rate due to planeto-plane interaction between cyanine thin filmsWe report an increase in exciton decay rates because of long-range interaction based on surface charge between cyanine thin films. The dependence of the decay rate on the spatial separation between the cyanine molecule layers shows that the rate is almost constant, which is different from the well-known energy transfer process. The rate is hardly affected by the fluctuation of the film thickness,

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Section: -6mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

2016

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“…9 Most notable among the emerging research trends has been the detailed examination of EET across short (i.e., <30 Å) separation distances; [10][11][12] apart from fundamental interest, such events are likely to be significant in light-harvesting arrays, 13 organic photovoltaics and OLEDs. 14 The rate of EET in such systems can be crucial in defining their overall efficiencies. Fast rates of EET are desirable to out-compete loss mechanisms and so maximize the EET efficacy.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Electronic Energy Transfer Beyond the Weak Coupling Limit in a Proximal but Orthogonal Molecular Dyad

et al. 2015

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Electronic energy transfer (EET) from a donor to an acceptor is an important mechanism that controls the light harvesting efficiency in a wide variety of systems, including artificial and natural photosynthesis and contemporary photovoltaic technologies. The detailed mechanism of EET at short distances or large angles between the donor and acceptor is poorly understood. Here the influence of the orientation between the donor and acceptor on EET is explored using a molecule with two nearly perpendicular chromophores. Very fast EET with a time constant of 120 fs is observed, which is at least forty times faster than the time predicted by Coulombic coupling calculations. Depolarization of the emission signal indicates that the transition dipole rotates through ca. 64 0 , indicating the near orthogonal nature of the EET event. The rate of EET is found to be similar to structural relaxation rates in the photo-excited oligothiophene donor alone, which suggests that this initial relaxation brings the dyad to a conical intersection where the excitation jumps to the acceptor.

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“…22 In our case the energy transfer in the bilayers is qualitatively explained, as described bellow, considering a long range interaction based on a surface-surface geometry. This means that PFO↔MEH PPV energy transfer in the bilayers can occur at larger distances compared to the Förster radius 23 or to the exciton dissociation length. The Förster radius R 0 , defined as the donor/acceptor separation distance for which direct donor decay is equally likely to transfer energy to the acceptor, has been calculated from the expression,…”

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confidence: 99%

Long range energy transfer in conjugated polymer sequential bilayers

Cury

Bourdakos

Dai

et al. 2011

The Journal of Chemical Physics

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Steady-state and time-resolved photoluminescence have been used to investigate the optical properties of bilayer and blend films made from poly(9,9-dioctyl-fluorene-2,7-diyl) (PFO) and poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH PPV). Energy transfer has been observed in both systems. From steady-state photoluminescence measurements, the energy transfer was characterized by the effective enhancement of the MEH PPV emission intensity after exciting the donor states. Relatively faster decays for the PFO donor emission have been observed in the blends as well as in the bilayer structures, confirming effective energy transfer in both structures. In contrast to the bilayers, the time decay of the acceptor emission in the blends presents a long decay component, which was assigned to the exciplex formation in these samples. For the blends the acceptor emission is in fact a composition of exciplex and MEH PPV emissions, the later being due to Förster energy transfer from PFO. In the bilayers, the exciplex is not observed and temperature dependence photoluminescence measurements show that exciton migration has no significant contribution to the energy transfer. The efficiency and very long range of the energy transfer in the bilayers is explained assuming a surface-surface interaction geometry where the donor/acceptor distances involved are much longer than the common Förster radius.

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Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films

Cited by 35 publications

References 21 publications

Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

Increase in exciton decay rate due to plane-to-plane interaction between cyanine thin films

Ultrafast Electronic Energy Transfer Beyond the Weak Coupling Limit in a Proximal but Orthogonal Molecular Dyad

Long range energy transfer in conjugated polymer sequential bilayers

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