Diffusion and long-range energy transfer

Gösele, U.; Hauser, Manfred; Klein, U.; Frey, Reinhard

doi:10.1016/0009-2614(75)85553-9

Cited by 170 publications

(84 citation statements)

References 12 publications

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“…The exciton quenching process can be described by diffusion with a sink term k(r) = a/r 6 with the correct distance dependence between the donor and acceptor r [22,23]. The donor and acceptor are approximated as point dipoles, i.e.…”

Section: Exciton Diffusion With Multiple Acceptorsmentioning

confidence: 99%

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

et al. 2014

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An important loss mechanism in organic electroluminescent devices is exciton quenching by polarons. Gradual electrochemical doping of various conjugated polymer films enabled the determination of the doping density dependence of photoluminescence quenching. Electrochemical doping was achieved by contacting the film with a solid electrochemical gate and an injecting contact. A sharp reduction in photoluminescence was observed for doping densities between 10 18 and 10 19 cm −3 . The doping density dependence is quantitatively modeled by exciton diffusion in a homogeneous density of polarons followed by either Förster resonance energy transfer or charge transfer. Both mechanisms need to be considered to describe polaron-induced exciton quenching. Thus, to reduce exciton-polaron quenching in organic optoelectronic devices, both mechanisms must be prevented by reducing the exciton diffusion, the spectral overlap, the doping density, or a combination thereof.

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Section: Exciton Diffusion With Multiple Acceptorsmentioning

confidence: 99%

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

et al. 2014

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“…Even if sufficient information is not available to calculate exact distances, relative dimensions of molecular structures can often be deduced (1,2,11), and in principle FRET is applicable to very complex molecular structures. The method has been applied successfully to estimate intra(inter)molecular distances between donor and acceptor molecules in biological molecules other than nucleic acids (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26), to determine molecular distributions in condensed media (27)(28)(29)(30)(31), and to estimate distances and distributions in a large variety of other polymer problems (26,32).…”

mentioning

confidence: 99%

Observing the helical geometry of double-stranded DNA in solution by fluorescence resonance energy transfer.

Clegg

Murchie²,

Zechel

et al. 1993

Proc. Natl. Acad. Sci. U.S.A.

276

260

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The efficiency of fluorescence resonance energy transfer (FRET) between fluorescein and rhodamine covalently attached to both 5' termini of a series of doublestranded DNA species (ranging from 8 to 20 bp) was measured. FRET efficiency varied with a dependence compatible with dye-to-dye distances (R) calculated on the basis of doublestranded B-DNA structure; the helical geometry of doublestranded DNA in solution is clearly evident. The experimental data were consistent with a 1/[1 + (RIRo)6] dependence of FRET efficiency characteristic for the Forster dipole-dipole mechanism. The thermal dissociation of the strands of the duplex DNA species can be followed by using FRET, and from these data we have been able to obtain enthalpies of duplex formation in good agreement with earlier measurements using alternative techniques. FRET measurements at very different salt concentrations can be accurately compared. We conclude that FRET is a reliable and valuable method for studying structure and conformational transitions in nucleic acids.Nucleic acids may adopt specific and sometimes complex folded structures that are critical for their biological function. Full determination of these structures requires the measurement of distances up to 80 A or more, but there are few techniques that allow such distances to be determined in solution. This is particularly important for nucleic acids in view of the extended helical structures involved, which can lead to underdetermination of structures by methods that can only yield short distances. Fluorescence resonance energy transfer (FRET) is sensitive to distances in the longer size range and has recently proved to be very useful in the study of nucleic acid structures, such as the solution structure of the four-way DNA junction (1, 2). FRET-derived distance information in DNA and RNA could be complementary to the shorter distances determined by NMR. However, the application of FRET to fluorescence probes covalently linked to nucleic acid structures has been relatively infrequent (1,(3)(4)(5)(6)(7)(8)(9)(10)(11).The rate of nonradiative energy transfer from an excited donor molecule (D) to a nearby acceptor molecule (A) depends in a characteristic manner on the distance between the two chromophores and their relative angular disposition (12)(13)(14). Depending on the D-A molecular pairs, the efficiency of transfer responds sensitively to relatively small changes of distances in the range of 10 to 80 A. Careful evaluations of FRET experiments can yield quantitative estimates of distances between labeled positions in macromolecules, or in molecular aggregates, provided that certain spectroscopic parameters are known. Even if sufficient information is not available to calculate exact distances, relative dimensions of molecular structures can often be deduced (1, 2, 11), and in principle FRET is applicable to very complex molecular structures. The method has been applied successfully to estimate intra(inter)molecular distances between donor and acceptor molecules in biological mo...

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“…It is generally assumed that the energy transfer from a host crystal (donor) to guest molecules (acceptor) can be adequately described as a diffusion process [4][5][6]. However, one has to be aware of the limits of the applicability of this model.…”

Section: The Diffusion Modelmentioning

confidence: 99%

“…In organic crystals the most frequently used concept is based on a diffusion or random walk model [5][6][7]. Another approach [8][9][10] was suggested by Förster, taking into account the long-range dipolar interaction between the donor and the acceptor and there also exist combined theories of the two approaches [11].…”

Section: Introductionmentioning

confidence: 99%

Singlet-Exciton Energy Transfer in Naphthalene Doped with Anthracene Following Two-Photon Picosecond Excitation: Dependence on Dopant Concentration

Auweter

Mayer

Schmid

1978

Zeitschrift Für Naturforschung A

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The time dependence of the sensitized fluorescence of anthracene-doped naphthalene crystals following two-photon picosecond excitation was studied for various dopant concentrations. The experimental results indicate that the characteristic of the energy transfer rate is significantly different for different anthracene concentrations. This behaviour is discussed in terms of different transfer mechanisms taking place at low and high dopant concentrations.

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Diffusion and long-range energy transfer

Cited by 170 publications

References 12 publications

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

Observing the helical geometry of double-stranded DNA in solution by fluorescence resonance energy transfer.

Singlet-Exciton Energy Transfer in Naphthalene Doped with Anthracene Following Two-Photon Picosecond Excitation: Dependence on Dopant Concentration

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