Dimensionality and temperature dependence of the radiative lifetime of J-aggregates with Davydov splitting of the exciton band

Scheblykin, Ivan G.; Bataiev, M.; Auweraer, Mark Van der; Vitukhnovsky, A. G.

doi:10.1016/s0009-2614(99)01252-x

Cited by 65 publications

(114 citation statements)

References 30 publications

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“…Further heating thermalizes the excitons and results in a decrease of the Stokes shift. This nonmonotonic behavior was observed in experiments on THIATS dye aggregates [3].…”

Section: Stokes Shiftsupporting

confidence: 58%

“…We focus on the Stokes shift of the fluorescence spectrum with respect to the absorption band. Figure 1 (upper panel) shows the results obtained under the conditions of a narrow energy window excitation in the blue-tail of the absorption band for the parameters J ¼ 740 cm À1 ; g 0 ¼ 2:7 Â 10 À7 J; s ¼ 0:23 J; and W 0 ¼ 30 J; which are characteristic for aggregates of 3; 3 0 -bis(sulfopropyl)-5; 5 0 -dichloro-9-ethylthiacarbocyanine (THIATS) [3,6]. We observe from Fig.…”

Section: Stokes Shiftmentioning

confidence: 99%

“…In particular, the fluorescence decay time in Jaggregates grows with increasing temperature [2], reflecting the superradiant nature of Frenkel exciton states coupled to the light. Some aggregates show a counter-intuitive non-monotonic temperature dependence of the Stokes shift of the fluorescence spectrum [3]. Femtosecond optical dynamics in squarylium dye J-aggregates was recently reported [4].…”

Section: Introductionmentioning

confidence: 95%

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Low-temperature spectral dynamics of excitons in molecular aggregates

Bednarz

Малышев²,

Knoester³

2005

Journal of Luminescence

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Low-temperature spectral dynamics of excitons in molecular aggregates Bednarz, M.; Malyshev, V.A.; Knoester, J. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractFluorescence spectra under various excitation and detection conditions are put forward to probe exciton spectral dynamics, resulting from hopping of excitons over localized states. We address the complexity of the exciton spectral dynamics, which is a direct consequence of the interplay of localization, intra-band relaxation and radiative relaxation of excitons. r

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“…Further heating thermalizes the excitons and results in a decrease of the Stokes shift. This nonmonotonic behavior was observed in experiments on THIATS dye aggregates [3].…”

Section: Stokes Shiftsupporting

confidence: 58%

Section: Stokes Shiftmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Low-temperature spectral dynamics of excitons in molecular aggregates

Bednarz

Малышев²,

Knoester³

2005

Journal of Luminescence

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“…For these species, typically, ␥ 0 Ϸ 1/3 ns −1 and Ϸ 600 nm. [47][48][49][50][51][52] With this in mind and choosing L = /2 ͑or kL =1͒, we obtain the following estimate: ⌫ R Ϸ 10 −18 n 0 cm 3 ps −1 . This value for L is easily accessible with the spin-coating method 42 and guarantees the applicability of the mean-field approach for the description of the thin film optical response.…”

Section: Discussion Of Driving Parametersmentioning

confidence: 89%

“…32 The typical width of the J band of polymethine dyes is on the order of several tens of cm −1 or approximately 1 ps −1 ͑in frequency units͒. [47][48][49][50][51][52] Thus, for the set of parameters we chose, the number density of molecules n 0 must be on the order of 10 19 cm −3 to get the ratio ⌫ R / * required for bistability to occur. This concentration is usually achieved in spin-coated films.…”

Section: Discussion Of Driving Parametersmentioning

confidence: 99%

Intrinsic optical bistability of thin films of linear molecular aggregates: The one-exciton approximation

Klugkist

Малышев

Knoester

2007

The Journal of Chemical Physics

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Link to publication Citation for published version (APA):Klugkist, J. A., Malyshev, V. A., & Knoester, J. (2007). Intrinsic optical bistability of thin films of linear molecular aggregates : the one-exciton approximation. Journal of Chemical Physics, 127(16), 164705-1/11. [164705]. DOI: 10.1063/1.2789416 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. We perform a theoretical study of the nonlinear optical response of an ultrathin film consisting of oriented linear aggregates. A single aggregate is described by a Frenkel exciton Hamiltonian with uncorrelated on-site disorder. The exciton wave functions and energies are found exactly by numerically diagonalizing the Hamiltonian. The principal restriction we impose is that only the optical transitions between the ground state and optically dominant states of the one-exciton manifold are considered, whereas transitions to other states, including those of higher exciton manifolds, are neglected. The optical dynamics of the system is treated within the framework of truncated optical Maxwell-Bloch equations, in which the electric polarization is calculated by using a joint distribution of the transition frequency and the transition dipole moment of the optically dominant states. This function contains all the statistical information about these two quantities that govern the optical response and is obtained numerically by sampling many disorder realizations. We derive a steady-state equation that establishes a relationship between the output and input intensities of the electric field and show that within a certain range of the parameter space this equation exhibits a three-valued solution for the output field. A time-domain analysis is employed to investigate the stability of different branches of the three-valued solutions and to get insight into switching times. We discuss the possibility to experimentally verify the bistable behavior.

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Ultranarrow Bandwidth Organic Photodiodes by Exchange Narrowing in Merocyanine H‐ and J‐Aggregate Excitonic Systems

Liess

Arjona-Esteban

Kudzus³

et al. 2018

Adv Funct Materials

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Ultranarrowband organic photodiodes (OPDs) are demonstrated for thin film solid state materials composed of tightly packed dipolar merocyanine dyes. For these dyes the packing arrangement can be controlled by the bulkiness of the donor substituent, leading to either strong H‐ or strong J‐type exciton coupling in the interesting blue (H‐aggregate) and NIR (J‐aggregate) spectral ranges. Both bands are shown to arise from one single exciton band according to fluorescence measurements and are not just a mere consequence of different polymorphs within the same thin film. By fabrication of organic thin‐film transistors, these dyes are demonstrated to exhibit hole transport behavior in spin‐coated thin films. Moreover, when used as organic photodiodes in planar heterojunctions with C60 fullerene, they show wavelength‐selective photocurrents in the solid state with maximum external quantum efficiencies of up to 11% and ultranarrow bandwidths down to 30 nm. Thereby, narrowing the linewidths of optoelectronic functional materials by exciton coupling provides a powerful approach to produce ultranarrowband organic photodiodes.

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Dimensionality and temperature dependence of the radiative lifetime of J-aggregates with Davydov splitting of the exciton band

Cited by 65 publications

References 30 publications

Low-temperature spectral dynamics of excitons in molecular aggregates

Low-temperature spectral dynamics of excitons in molecular aggregates

Intrinsic optical bistability of thin films of linear molecular aggregates: The one-exciton approximation

Ultranarrow Bandwidth Organic Photodiodes by Exchange Narrowing in Merocyanine H‐ and J‐Aggregate Excitonic Systems

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