1985
DOI: 10.1103/physrevb.32.4946
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Investigation of the appropriateness of sensitized luminescence to determine exciton motion parameters in pure molecular crystals

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1988
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Cited by 40 publications
(43 citation statements)
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“…This corrects our previous findings 20 and establishes a lower limit 39,40 for the magnitude of the energy migration rate constant in these systems of 0.12 ps -1 (1.2 × 10 -11 s -1 ). This value is in excellent agreement with recent reports [7][8][9] where the intramolecular energy migrations rate constant is computed for oligoindenofluorenes to be in the range of 0.06-0.25 ps -1 .…”
Section: Discussionsupporting
confidence: 75%
“…This corrects our previous findings 20 and establishes a lower limit 39,40 for the magnitude of the energy migration rate constant in these systems of 0.12 ps -1 (1.2 × 10 -11 s -1 ). This value is in excellent agreement with recent reports [7][8][9] where the intramolecular energy migrations rate constant is computed for oligoindenofluorenes to be in the range of 0.06-0.25 ps -1 .…”
Section: Discussionsupporting
confidence: 75%
“…As a helpful method to discriminate between capture and motion effects, surface-quenched time-resolved luminescence experiments have been also suggested. 17,23 Recent time-resolved luminescence decay measurements in conjugated polymer/fullerene heterostructures confirmed the dominance of diffusion-limited exciton quenching. 24 Consequently, eq 1 can be simplified by assuming an infinite exciton quenching rate at the polymer/fullerene interface, without any x dependence.…”
Section: Resultsmentioning
confidence: 99%
“…Two decades ago, it had been extensively demonstrated that a similar model, applied in molecular crystals with exciton traps, can cause a dramatic underestimation of the characteristic diffusion parameters: diffusion constant D and diffusion length L D . 17 This originates from the fact that two distinct rates govern the total exciton quenching process: the rate at which excitons migrate into the regions occupied by trap molecules, quantified by the diffusion term in eq 1, and second, the rate at which an excitation decays to the trap states from neighboring host molecules once it approaches a trap, described by the dissociation (capture) term in eq 1 given by -S(x)n(x, t). Thus, luminescence quenching by exciton traps introduced into organic crystals has been proven to be capture-but not motion-limited, which results from the fact that the exciton motion is faster then the exciton capture by traps.…”
Section: Resultsmentioning
confidence: 99%
“…Thus, different research groups report different values of exciton diffusion length even for the same material largely due to the differences in the experimental methods they employ and the modeling of the data collected from these experiments. [6,8,[12][13][14][15] Most of these techniques are based on the quenching of photoluminescence (PL) in a bilayer donor/acceptor heterostructure where the population of photogenerated excitons is observed in the donor layer. After photoexcitation of the donor phase, the excitons migrate to the donor/acceptor interface and the excitons split into charges by transferring electrons to the acceptor phase.…”
Section: Introductionmentioning
confidence: 99%