Lifetimes of exciton-polariton luminescence of anthracene crystal at low temperature

Galanin, M. D.; Khan-Magometova, Sh.D.

doi:10.1016/0022-2313(79)90069-3

Cited by 11 publications

(3 citation statements)

References 12 publications

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“…The 623 nm emission increases in the first 0.17 ns and decays in 1.9 ns. The increasing characteristic lifetime of the excitons with increasing wavelength has been observed earlier by Galanin and Khan‐Magometova, and interpreted theoretically by Berberan‐Santos et al . This correlation would be coherent with an underlying reabsorption mechanism, an effect that only becomes negligible for smaller, sub‐micrometer‐scaled crystals .…”

Section: Resultssupporting

confidence: 75%

Fluorescence Spectroscopy of AdamBODIPY Single Crystals

et al. 2017

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Interest in the fluorescence of organic solids is increasing with the development of nanosensors and research into new molecules with aggregation‐induced fluorescence properties. We have gone beyond the qualitative observation of fluorescence by analyzing the luminescence properties of planar single crystals of a 4,4′‐difluoro‐4‐bora‐(3a,4a)‐diaza‐s‐indacene (BODIPY) derivative with micrometric dimensions. A simple Frenkel exciton model applied to this crystal predicts one band. From time‐resolved fluorescence spectra, three emissions were distinguished. The shortest‐lived one at λ=547 nm was predicted by theory and corresponds to an exciton lifetime of 0.9 ns. A trap with an intermediate emission lifetime of 1.2 ns was found at 569 nm and a final trap at 620 nm has a lifetime of 1.9 ns. These attributions were confirmed by the study of the polarization of these emissions. The 547 nm emission was polarized along the long axis of the crystal as predicted by the Frenkel exciton model. The 569 nm emission was polarized perpendicularly to the plane of the crystal and the 620 nm emission was polarized along the short axis. Thus, the two red‐shifted bands were related to well‐defined defects with specific orientations in the crystal. Fluorescence lifetime imaging measurements showed that the density of these defects is not uniform and that under our synthesis conditions, they are formed in the initial steps of the growth and therefore appear in the center of the crystals.

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Section: Resultssupporting

confidence: 75%

Fluorescence Spectroscopy of AdamBODIPY Single Crystals

et al. 2017

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“…This basically also applies for organic crystals, 16,[33][34][35][36] however, because of the only weak van der Waals interactions in molecular crystals they are much a) Stehr@Physik.Uni-Wuerzburg.de less rigid. That is why lattice vibrations play a more important role in organic than in inorganic materials, as they destroy the long-range order and lead to a localization of the charge carriers and excitons.…”

Section: Introductionmentioning

confidence: 96%

Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches

Stehr

Engels

Deibel

et al. 2014

The Journal of Chemical Physics

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Due to its importance for the function of organic optoelectronic devices, accurate simulations of the singlet exciton diffusion are crucial to predict the performance of new materials. We present a protocol which allows for the efficient directional analysis of exciton transport with high-level ab initio methods. It is based on an alternative to the frequently employed rate equation since the latter was found to be erroneous in some cases. The new approach can be used in combination with the master equation which is considerably faster than the corresponding Monte Carlo approach. The long-range character of the singlet exciton coupling is taken into account by an extrapolation scheme. The approach is applied to singlet exciton diffusion in those substances where these quantities are experimentally best established: naphthalene and anthracene. The high quality of the crystals, furthermore, diminish uncertainties arising from the geometrical structures used in the computations. For those systems, our new approach provides exciton diffusion lengths L for naphthalene and anthracene crystals which show an excellent agreement with their experimental counterparts. For anthracene, for example, the computed L value in a direction is computed to 58 nm while the experimental value is 60 ± 10 nm.

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“…Exciton transport in covalently bonded inorganic crystals is mainly described by band transport, which basically also holds for organic crystals. ,− However, the only weak van der Waals interactions lead to less rigidity of these molecular crystals, lattice vibrations are more pronounced in organic than in inorganic crystals. This strongly affects the long-range order on the relevant time scale for exciton motion and, therefore, can lead to a localization of charge carriers and excitons.…”

Section: Introductionmentioning

confidence: 99%

Singlet Exciton Diffusion in Organic Crystals Based on Marcus Transfer Rates

Stehr

Fink

Engels

et al. 2014

J. Chem. Theory Comput.

102

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Exciton diffusion is a critical step for energy conversion in optoelectronic devices. This spawns the desire for theoretical approaches that allow for fast but reliable determinations of the material-dependent exciton transport parameters. For this purpose, the Marcus theory, which is widely used in the context of charge transport, is adapted to exciton diffusion. In contrast to the common approach of calculating the exciton hopping rate via the coupling and the spectral overlap, this alternative approach is less costly, because, instead of the spectral overlap, only the reorganization energy is needed. To demonstrate the capability of the approach, the diffusion constants for naphthalene, anthracene, and diindenoperylene crystals are calculated and compared with both calculations conducted with the well-established exciton hopping rate, including coupling and spectral overlap, and with experimental data. These test calculations show that Marcus-based exciton diffusion properties tend to be too small but are qualitatively correct (i.e., they seem to be useful to predict trends). Nevertheless, for reliable results, high-level quantum chemical approaches are necessary for the computation of the reorganization energies. However, they have to be calculated only once. Coupling constants, which are needed for all pairs of monomers, have a considerably smaller influence, i.e., they can be computed by a lower level approach, which makes the method even less costly.

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Lifetimes of exciton-polariton luminescence of anthracene crystal at low temperature

Cited by 11 publications

References 12 publications

Fluorescence Spectroscopy of AdamBODIPY Single Crystals

Fluorescence Spectroscopy of AdamBODIPY Single Crystals

Anisotropy of singlet exciton diffusion in organic semiconductor crystals from ab initio approaches

Singlet Exciton Diffusion in Organic Crystals Based on Marcus Transfer Rates

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