Parameter recovery and discrimination between different types of fluorescence decays obtained for dipole-dipole energy transfer in low-dimensional systems

Auweraer, Mark Van der; Ballet, P.; Schryver, F. C. De; Kowalczyk, Andrzej

doi:10.1016/0301-0104(94)89022-6

Cited by 30 publications

(39 citation statements)

References 48 publications

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“…For longer wavelengths they are arranged in a three‐dimensional space. This conclusion is drawn under the supposition that in both cases the FRET mechanism is working efficiently and that in a sphere with Foerster radius Ro of investigated chromophores (Ro is about 10 Å), not more than three acceptors are present (44). Both conditions may not be exactly fulfilled, but different values of γ show that in various spectral regions of emission, chromophores differently arranged or mutually interacting differently are engaged.…”

Section: Resultsmentioning

confidence: 91%

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Fluorescence Polarization Studies of B‐Phycoerythrin Oriented in Polymer Film¶

Fra̧ckowiak

Ptak

Gryczyński

et al. 2004

Photochem & Photobiology

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Polarized steady-state fluorescence and fluorescence excitation spectra as well as time-resolved fluorescence for B-phycoerythrin (B-PE) from red algae, Porphyridium cruentum, embedded in polyvinyl stretched films were measured. The lifetimes of polarized fluorescence were analyzed using exponential components and fractal models. The interactions between various chromophores of the pigment-protein complexes investigated were discussed. The anisotropy of fluorescence excitation spectra differs from the anisotropy of absorption spectra and depends on the wavelength of observation. This shows that differently oriented chromophores take part in various paths of excitation energy transfer (ET) or change their excitation into heat with various efficiencies (or both). Also, analysis of time-resolved fluorescence measured in various spectral regions gives different polarized components of emission. Fractal analysis of lifetimes, done under supposition of the Foerster resonance ET mechanism, suggests different arrangements of energy donors and acceptors for molecules absorbing in different spectral regions. It shows that several fractions of differently oriented "forms" of chromophores exhibiting different spectral properties occur in B-PE complexes. Small changes in the orientation of the chromophores can be followed by modification of the path of excitation energy migration. Based on the results obtained a new reorientational mechanism of the State 1 --> State 2 transition was proposed: Even small conformational modifications of biliproteins, which could be caused in vivo by the change in the conditions of preillumination of bacteria, are able to modify the path of excitation ET. Such a reorientation may be responsible for the change in the partition of biliprotein excitation energy between photosystem II (PSII) and PSI (State 1 --> State 2 transition). The proposed mechanism needs further verification by the investigation of whole bacteria cells.

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Section: Resultsmentioning

confidence: 91%

“…Such a model describes the decay of emitting molecules located in close proximity to acceptor molecules. This kind of analysis can provide some information about the arrangement of acceptor molecules and intermolecular interactions (44).…”

Section: Resultsmentioning

confidence: 99%

Fluorescence Polarization Studies of B‐Phycoerythrin Oriented in Polymer Film¶

Fra̧ckowiak

Ptak

Gryczyński

et al. 2004

Photochem & Photobiology

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“…Although all fluorescence decays could be analyzed as a sum of two exponentials one cannot exclude that this is just an approximation of a more complex decay, especially in the blend films. 65 Therefore rather than using the individual decay times we determined the average decay time <τ> from the individual decay times (τ i ) and their amplitudes (A i ) using Eq. 1.…”

Section: Blend Films Of P3ht and Pbs Qdsmentioning

confidence: 99%

Charge separation dynamics at bulk heterojunctions between poly(3-hexylthiophene) and PbS quantum dots

Firdaus

Miranti

Fron

et al. 2015

Journal of Applied Physics

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Photo-induced electron transfer between P3HT and small (2.4 nm) PbS QDs, capped by different ligands, was studied by picosecond and femtosecond time-resolved fluorescence and by photo-induced absorption (PIA) measurements. In line with previous experiments, we observed that the efficiency of the quenching of P3HT by PbS QDs increased upon decreasing the average thickness of the ligand shell. This trend was also observed in the PIA spectra and in prior work on the performance of photovoltaic devices where the active layer was a blend of P3HT with PbS QDs capped by different ligands.Combining the pico-and femtosecond fluorescence decays showed that the quenching in blend films of P3HT and PbS QDs treated with 1,4-benzenedithiol occurred over a broad time scale ranging from tens of femtoseconds to hundreds of picoseconds. This complex kinetics was attributed to exciton hopping followed by electron transfer to the conduction band of the QDs. We also compared the wavelength dependence of the internal quantum efficiency (IQE) in the hybrid photovoltaic devices to those devices where the photoactive layer consists of PbS QDs only. While excitation in the first excitonic transition of the PbS QDs yielded a similar IQE in both devices, the IQE of the hybrid devices tripled at wavelengths where also P3HT started to absorb. This suggests that upon excitation of P3HT in the latter devices charge generation occurs by photo-induced electron transfer from P3HT to the QDs rather than by energy transfer to the QDs followed by exciton dissociation in the QDs.

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“…The values of ε close to 0.5 are also compatible with a sequence of exciton diffusion and trapping in 1-, 2-and 3-D. For 2-and 3-D systems exciton diffusion and trapping will also increase λ. 75,77,[79][80][81] The values of ε obtained for the multilayers could be related to the spatial organization of those systems found by Near-Field Scanning optical Microscopy (NSOM). [84][85][86] The results for the THIATS-PAH mixture have already been reported.…”

Section: Dye-polyelectrolyte Mixturesmentioning

confidence: 99%

Comparison between J-aggregates in a self-assembled multilayer and polymer-bound J-aggregates in solution: a steady-state and time-resolved spectroscopic study

Rousseau

Koetse

Auweraer

et al. 2002

Photochem Photobiol Sci

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The self-assembly of a thiacarbocyanine dye on a charged substrate via the layer-by-layer alternate adsorption technique was studied in detail. The influence of the chemical structure of the oppositely charged polyelectrolyte (PEL) in the multilayer on J-aggregate formation was investigated by means of absorption spectroscopy and steady-state and time-resolved fluorescence spectroscopy. J-Aggregates were formed yielding a bathochromic narrow absorption band. Fine tuning of the position of the absorption band is possible by incorporating other polyelectrolytes in the multilayer. The results obtained for the dye-polyelectrolyte multilayers were compared with measurements made on the aqueous dye-polyelectrolyte mixtures. The parameters obtained by fitting the fluorescence decays to several different models allowed us to suggest a mechanism for the non-radiative decay channel. The low fluorescence quantum yields and fast non-exponential fluorescence decays obtained for both the dye-polyelectrolyte multilayers and the aqueous dye polyelectrolyte mixtures were attributed to the trapping of a fast migrating exciton by a non-luminescent trap. The results related to J-aggregate formation, decay time and dimensionality of the aggregates were compared in solution and in a self-assembled multilayer.

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Parameter recovery and discrimination between different types of fluorescence decays obtained for dipole-dipole energy transfer in low-dimensional systems

Cited by 30 publications

References 48 publications

Fluorescence Polarization Studies of B‐Phycoerythrin Oriented in Polymer Film¶

Fluorescence Polarization Studies of B‐Phycoerythrin Oriented in Polymer Film¶

Charge separation dynamics at bulk heterojunctions between poly(3-hexylthiophene) and PbS quantum dots

Comparison between J-aggregates in a self-assembled multilayer and polymer-bound J-aggregates in solution: a steady-state and time-resolved spectroscopic study

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