On the theory of concentrational quenching of fluorescence in one-, two- and three-dimensional medium

Sienicki, K.

doi:10.1016/0301-0104(90)90007-v

Cited by 9 publications

(2 citation statements)

References 32 publications

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“…18,25,26 Most theoretical studies focus on the integral quantities, like quantum yield or mean fluorescence lifetime. 2,18,22,25 The time dependence of the kinetics themselves is analyzed much more rarely. Even though it is simpler to focus on the integral quantities, and the experimental literature usually does so, the information content in these integral quantities is much smaller than in the kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Perhaps the most well-known limit is the case of a single donor molecule surrounded by an infinite number of infinitely deep acceptors. , Expressions for two-dimensional (2D), three-dimensional (3D), and even fractal-dimensional systems can be obtained . Accounting for the energy transfer between the donor molecules is also possible, but the resulting expressions can be rather cumbersome and still require numerical evaluations. − All this highlights the importance of fully numerical investigations, which should explicitly account for excitation migration and trapping in specific molecular configurations via kinetic equations or Monte Carlo simulation-based methods. Unfortunately, such works are relatively rare. ,, …”

Section: Introductionmentioning

confidence: 99%

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Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems

Barysaitė,

Chmeliov,

Valkunas

et al. 2024

J. Phys. Chem. B

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Fluorescence concentration quenching occurs when increasing molecular concentration of fluorophores results in a decreasing fluorescence quantum yield. Even though this phenomenon has been studied for decades, its mechanisms and signatures are not yet fully understood. The complexity of the problem arises due to energy migration and trapping in huge networks of molecules. Most of the available theoretical work focuses on integral quantities like fluorescence quantum yield and mean excitation lifetime. In this work, we present a numerical study of the fluorescence decay kinetics of three-dimensional and two-dimensional molecular systems. We investigate the differences arising from the variations in models of trap formations. We also analyze the influence of the molecular orientations to the fluorescence decay kinetics. We compare our results to the well-known analytical models and discuss their ranges of validity. Our findings suggest that the analytical models can provide inspiration for different ways of approximating the fluorescence kinetics, yet more detailed analysis of the experimental data should be done by comparison with numerical simulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems

Barysaitė,

Chmeliov,

Valkunas

et al. 2024

J. Phys. Chem. B

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Investigations of the excitation energy transport mechanism in donor-acceptor systems

et al. 1991

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Measurements of fluorescence quantum yield ηD/ηoD of Na-fluorescein (donor; D) versus concentration of rhodamine B (acceptor; A) in viscous solutions have been carried out. The donor concentration in these solutions was as follows:C D=2·10(-2) M (system I), 1.5·10(-2) M (II), 10(-2) M (III), 3·10(-3) M (IV), and 5·10(-5) M (V). The experimental results have been compared with current theories of nonradiative electronic energy transfer (NEET). In the case of very strong migration (systems I, II, and III), a significant influence of correlations (between configurations of D and A molecules in the surroundings of successively excited donors) on quantum yield ηD/ηoD has been determined. Experimental values have been found to be clearly higher in comparison with those predicted theoretically. The influence of possible factors on the decrease in the effectiveness of excitation energy transport to traps-acceptors in systems of very strong migration has been discussed.

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Direct and reverse energy transport in systems of monomers and imperfect traps: Monte Carlo simulations

Kułak

Bojarski

1992

J Fluoresc

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A Monte Carlo simulation of the concentration dependence of the fluorescence quantum yield ŋM and emission anisotropyr M of a system containing dye molecules in the form of monomers M and clusters T (statistical pairs and trimers) playing the role of the imperfect traps for nonradiative excitation energy transfer (NET) has been carried out. The simulation has been made for determined values of Förster critical distancesR 0 (MM) andR 0 (MT) and for several values ofR 0 (TM) andR 0 (TT) , assuming that the energy may be transferred from M(*) to T as well as from T(*) to M (reverse nonradiative energy transfer, RNET). It was shown that the RNET process in the range of high concentrations may strongly change the values ofr M as well as those of ŋM. For emission anisotropyr M an effect of repolarization was observed which decreases rapidly with increasingR 0 (TM) andR 0 (TT) . A very good agreement between the simulation results of ŋM and the theoretical model with no adjustable parameters was found. In the model, the RNET process and influence of correlation between active molecules on energy migration among monomers were taken into account.

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On the theory of concentrational quenching of fluorescence in one-, two- and three-dimensional medium

Cited by 9 publications

References 32 publications

Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems

Concentration Quenching of Fluorescence Decay Kinetics of Molecular Systems

Investigations of the excitation energy transport mechanism in donor-acceptor systems

Direct and reverse energy transport in systems of monomers and imperfect traps: Monte Carlo simulations

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