The diffusion of the excitation energy in molecular crystals

Trlifaj, Miroslav

doi:10.1007/bf01602895

Cited by 97 publications

(9 citation statements)

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“…If the interaction with lattice vibrations is more pronounced, e.g. at higher temperatures, the phases are so quickly destroyed that the exciton motion must be described by some kind of hopping process [3]. Whereas previously both limiting cases had been dealt with in detail in the literature, a few years ago we developed a model which allows for studying the total transition range from one kind of motion to the other one [4].…”

Section: W 1 Introductionmentioning

confidence: 99%

An exactly solvable model for coherent and incoherent exciton motion

1973

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Section: W 1 Introductionmentioning

confidence: 99%

An exactly solvable model for coherent and incoherent exciton motion

1973

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“…However, if migration processes among donors are important then the problem is more complex and different approximations have been developed in order to analyze this situation. One possibility is to consider the energy migration as a diffusion process [38][39][40][41]. This method was adopted by Yokota and Tanimoto (YT) [39], who obtained a simple expression for the temporal evolution of excited donors.…”

Section: Decay Curve Analysismentioning

confidence: 99%

Luminescence properties of Sm³⁺-doped P₂O₅–PbO–Nb₂O₅glass under high pressure

Praveena¹,

Venkatramu²,

Babu³

et al. 2008

J. Phys.: Condens. Matter

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Samarium doped lead phosphate glass modified with niobium having a composition (in mol%) of 55P(2)O(5)+39.5PbO+5Nb(2)O(5)+0.5Sm(2)O(3) has been prepared by the conventional melt quenching technique. The emission spectra and the decay curves for the (4)G(5/2) level of Sm(3+) ions have been measured as a function of pressure up to 23.6 GPa at room temperature. A discontinuity in the observed shifts and crystal-field splittings as a function of pressure around 9-10 GPa suggests that a phase transition is taking place in the glass matrix. The [Formula: see text], (6)H(7/2) and (6)H(9/2) transitions are shifted towards the lower energy side with magnitudes of -7.1, -7.6 and -5.5 cm(-1) GPa(-1) up to 8.9 GPa (phase 1) and -5.6, -4.9 and -4.4 cm(-1) GPa(-1) beyond 10.3 GPa (phase 2), respectively. A much stronger increase in the splitting of the [Formula: see text] and [Formula: see text] Stark levels with pressure is observed in phase 1 than in phase 2. The lifetime of the (4)G(5/2) level decreases from 2.29 ms (0 GPa) to 0.64 ms (23.6 GPa) with pressure. The decay curves of the (4)G(5/2) level exhibit non-exponential behavior for all the pressures and were fitted by the generalized Yokota-Tanimoto model to probe the nature of the energy transfer process. The best fits with S = 6 indicate that the energy transfer between donor and acceptor is of dipole-dipole type. The crystal-field splitting experienced by the Sm(3+) ions in the title glass are found to be larger than those found in borate, K-Ba-Al phosphate and tellurite glasses.

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“…In this case the acceptor acts as a drain and causes a decrease of the exciton density around the acceptor thereby decreasing the effective rate of energy transfer. If the diffusion is very fast no such bottleneck occurs and the problem can be described in terms of the "hopping model" using a master equation [7]. On the other hand, if the step-width of the random walk problem is too large, the random walk picture is no longer adequate and should be replaced by a long range interaction model [8 -10].…”

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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The diffusion of the excitation energy in molecular crystals

Cited by 97 publications

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An exactly solvable model for coherent and incoherent exciton motion

An exactly solvable model for coherent and incoherent exciton motion

Luminescence properties of Sm³⁺-doped P₂O₅–PbO–Nb₂O₅glass under high pressure

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

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The diffusion of the excitation energy in molecular crystals

Cited by 97 publications

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An exactly solvable model for coherent and incoherent exciton motion

An exactly solvable model for coherent and incoherent exciton motion

Luminescence properties of Sm3+-doped P2O5–PbO–Nb2O5glass under high pressure

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

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Luminescence properties of Sm³⁺-doped P₂O₅–PbO–Nb₂O₅glass under high pressure