Scheibe Aggregates

Möbius, Dietmar

doi:10.1002/adma.19950070503

Cited by 341 publications

(306 citation statements)

References 87 publications

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“…For 54.7°< q < 90°, the exciton band is located energetically above the monomer band caus− ing a blue shift, and corresponding aggregates are termed H−aggregates [18]. When q = 54.7°, no shift in the absorp− tion spectrum is observed, and the aggregates are then called I−aggregates [23].…”

Section: Discussionmentioning

confidence: 99%

“…When 0°< q < 54.7°, the exciton band is energetically lo− cated below the monomer band causing a red shift in the electronic absorption spectrum, and creating aggregates are called J−aggregates [23]. For 54.7°< q < 90°, the exciton band is located energetically above the monomer band caus− ing a blue shift, and corresponding aggregates are termed H−aggregates [18].…”

Section: Discussionmentioning

confidence: 99%

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Spectral properties of naphthalimide dyes mixed with 4-heptyl-4′-cyanobiphenyl (7CB) in Langmuir-Blodgett films

Bielejewska

Chrzumnicka

Stolarski

et al. 2010

Opto-Electronics Review

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Langmuir-Blodgett (LB) films formed of some fluorescent dyes, namely derivatives of 4-aminonaphthalimide, and their binary mixtures with the liquid crystal 4-heptyl-4′-cyanobiphenyl (7CB) have been studied. The electronic absorption and fluorescence spectra were recorded. On the basis of these spectra, the spectral properties of the dyes and the intermolecular interactions in ultrathin ordered films were determined. The conclusions about the tendency to the creation of aggregates by dye molecules in LB films have been drawn. The measurements of absorption by using linearly polarised light have allowed us to determine the arrangement of the dye and liquid crystal molecules on the air-solid substrate interface.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Spectral properties of naphthalimide dyes mixed with 4-heptyl-4′-cyanobiphenyl (7CB) in Langmuir-Blodgett films

Bielejewska

Chrzumnicka

Stolarski

et al. 2010

Opto-Electronics Review

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“…J-aggregates, [82][83][84] named after Jelley, are relatively ordered molecular arrays whose transition dipoles are arranged in such a way that large exciton delocalization is present in the low-energy excitation bands. They have technologically relevant optical properties such as a narrow absorption band that exhibits a large absorption intensity at the expense of a large number of quasi-dark excited states.…”

Section: B Stokes Shifts In Ideal J-aggregatesmentioning

confidence: 99%

A stochastic reorganizational bath model for electronic energy transfer

Fujita

Huh

Aspuru‐Guzik

2014

The Journal of Chemical Physics

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The fluctuations of optical gap induced by the environment play crucial roles in electronic energy transfer dynamics. One of the simplest approaches to incorporate such fluctuations in energy transfer dynamics is the well known Haken-Strobl-Reineker model, in which the energy-gap fluctuation is approximated as a white noise. Recently, several groups have employed molecular dynamics simulations and excited-state calculations in conjunction to take the thermal fluctuation of excitation energies into account. Here, we discuss a rigorous connection between the stochastic and the atomistic bath models. If the phonon bath is treated classically, time evolution of the exciton-phonon system can be described by Ehrenfest dynamics. To establish the relationship between the stochastic and atomistic bath models, we employ a projection operator technique to derive the generalized Langevin equations for the energy-gap fluctuations. The stochastic bath model can be obtained as an approximation of the atomistic Ehrenfest equations via the generalized Langevin approach. Based on the connection, we propose a novel scheme to correct reorganization effects within the framework of stochastic models. The proposed scheme provides a better description of the population dynamics especially in the regime of strong exciton-phonon coupling. Finally, we discuss the effect of the bath reorganization in the absorption and fluorescence spectra of ideal J-aggregates in terms of the Stokes shifts. For this purpose, we introduce a simple relationship that relates the reorganization contribution to the Stokes shifts - the reorganization shift - to three parameters: the monomer reorganization energy, the relaxation time of the optical gap, and the exciton delocalization length. This simple relationship allows one to classify the origin of the Stokes shifts in molecular aggregates

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“…Already in 1975, it was suggested by Philpott and Sherman 31 that monolayers of quinque-thiophene might exhibit polaritons effects and may serve as a model system. Previous studies on monolayer optical properties have included Langmuir Blodgett layers at the air water interface 32,33 and submonolayers of sexithiophene deposited by vacuum sublimation. 34,35 Coupling of the excitations with the electromagnetic field is evidenced by the observation of a reflection band at frequencies close to excitonic transitions of the coupled chromophoric groups.…”

Section: Introductionmentioning

confidence: 99%

Reflection and extinction of light by self-assembled monolayers of a quinque-thiophene derivative: A coherent scattering approach

Gholamrezaie

Leeuw

Meskers

2016

The Journal of Chemical Physics

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Scattering matrix theory is used to describe resonant optical properties of molecular monolayers. Three types of coupling are included: exciton-exciton, exciton-photon, and exciton-phonon coupling. We use the K-matrix formalism, developed originally to describe neutron scattering spectra in nuclear physics to compute the scattering of polaritons by phonons. This perturbation approach takes into account the three couplings and allows one to go beyond molecular exciton theory without the need of introducing additional boundary conditions for the polariton. We demonstrate that reflection, absorption, and extinction of light by 2D self-assembled monolayers of molecules containing quinque-thiophene chromophoric groups can be calculated. The extracted coherence length of the Frenkel exciton is discussed.

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Scheibe Aggregates

Cited by 341 publications

References 87 publications

Spectral properties of naphthalimide dyes mixed with 4-heptyl-4′-cyanobiphenyl (7CB) in Langmuir-Blodgett films

Spectral properties of naphthalimide dyes mixed with 4-heptyl-4′-cyanobiphenyl (7CB) in Langmuir-Blodgett films

A stochastic reorganizational bath model for electronic energy transfer

Reflection and extinction of light by self-assembled monolayers of a quinque-thiophene derivative: A coherent scattering approach

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