Exciton delocalization of the J‐aggregate of oxacyanine dye and thiacyanine dye in LB films

Yonezawa, Yoshiro; Yamaguchi, Atsushi; Kometani, Noritsugu

doi:10.1002/pssb.200460002

Cited by 11 publications

(20 citation statements)

References 11 publications

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“…In few cases two J-aggregate forming dyes with different J-band peak position have also been mixed to control the extent of aggregation [37][38][39]. Luminescence properties of the mixed Jaggregate consisting of two kinds of thiacarbocyanine dyes or naphthothiacarbocyanine dyes having meso-substituent have been studied by Y. Yonezawa et al [40] They also investigated the luminescence properties of the J aggregate of cyanine dyes in phospholipid langmuir-Blodgett films and exciton delocalization of the J-aggregate of oxacyanine dye and thiacyanine dye in LB films [41][42]. A.G. Vitukhnovsky et al Investigated the fluorescence properties of mixed J -aggregates of quinocyanine dyes [43].…”

Section: Dilution Experiments Of Nk J-aggregates In Otabmentioning

confidence: 99%

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

Hussain

Dey

Chakraborty

et al. 2011

Journal of Luminescence

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Abstract:In the present communication we report the preparation and characterizations of Langmuir and LangmuirBlodgett films of a thiacyanine dye -dioctadecyl thiacyanine perchlorate (NK) mixed with Octadecyl trimethyl ammonium bromide (OTAB). The relationship between the molar ratio of OTAB and NK and the orientation of molecules at the air-water interface was investigated using surface pressure -area per molecule (π-A) isotherm. UV-Vis absorption and fluorescence spectroscopic investigations reveal that prominent J-aggregation of NK molecule was observed in the LB films lifted at higher surface pressure. This J-aggregation can be controlled by diluting the NK molecules with OTAB. It was observed that the J-aggregates of NK decayed to monomer and Haggregates when the NK-LB film was exposed to a monochromatic light of wavelength 460 nm (

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Section: Dilution Experiments Of Nk J-aggregates In Otabmentioning

confidence: 99%

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

Hussain

Dey

Chakraborty

et al. 2011

Journal of Luminescence

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“…One of the unique properties of J -aggregates is exciton migration over hundreds of monomers. – ,– Due to this feature, J -aggregates can be considered as optical antenna for energy delivery purposes. ,, Exciton properties of J -aggregates are similar to those of light-harvesting complexes (LHC), which provide extremely fast and efficient energy transport of the absorbed sunlight to the photochemical reaction center of plants and photosynthetic bacteria. , Indeed, it was shown that the J -aggregates of cylindrical structure are the most promising artificial systems to mimic LHCs. , …”

Section: Introductionmentioning

confidence: 99%

Control of Exciton Migration Efficiency in Disordered J-Aggregates

et al. 2009

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Using luminescent exciton traps, an efficiency of the exciton migration in J-aggregates of an amphiphilic analogue of pseudoisocyanine (amphi-PIC) dye in solutions, has been investigated. Applying a modified Stern−Volmer equation for analysis of the J-aggregate luminescence quenching by the trap, the quenching of 50% of amphi-PIC J-aggregate luminescence accessible for trapping at the ratio amphi-PIC/DiD = 120:1 has been revealed. To increase the exciton migration efficiency, the J-aggregate structure was improved by the formation of a “J-aggregate−surfactant” complex. The J-aggregate structure improvement is confirmed by the about 3 times increase in the exciton delocalization length that leads to the 1.3 times enhancement in the exciton migration efficiency in solutions with the surfactant. To the best of our knowledge, such a control of the exciton transport parameters in J-aggregates in solutions has not been demonstrated yet.

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“…(8). It can be seen that the decay of the fluorescence of the donor becomes faster when the concentration of acceptors increases due to the donor to acceptor energy transfer as it is experimentally observed [11]. It is shown that the fluorescence intensity increases from low concentration until a maximum is reached at c = 0.2.…”

Section: Mixed J-aggregates Of (S9/s11) Moleculesmentioning

confidence: 58%

Exciton energy transfer in mixed J‐aggregates

Lemaistre

2008

Physica Status Solidi (b)

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A computational method to analyze the exciton energy transfer and trapping mechanisms in mixed J‐aggregates featuring a donor–acceptor system is provided. For a given geometrical configuration, the intermolecular interactions are calculated using the extended dipole method. Numerical diagonalization of the aggregate Hamiltonian is performed taking into account the static disorder. The density of states, the absorption lineshapes and the relative number of coherently coupled molecules within the donor and acceptor bands are obtained. The excitation energy transfer processes among the excited states of the donor–acceptor system (intraband and interband scatterings) are described through an exciton‐phonon coupling model. The scattering rates are calculated and used in a Master Equation to obtain the time evolution of the exciton populations after initial excitation. Our simulation method is used to analyze the excitation energy transfer between two kinds of closely spaced linear parallel chains featuring the so‐called blue (donor) and red (acceptor) structures of pseudoisocyanine molecules (PIC). It is also applied to describe the energy transfer in the mixed J‐aggregate of oxacyanine (donor) and thiacyanine (acceptor) molecules. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Exciton delocalization of the J‐aggregate of oxacyanine dye and thiacyanine dye in LB films

Cited by 11 publications

References 11 publications

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

Control of Exciton Migration Efficiency in Disordered J-Aggregates

Exciton energy transfer in mixed J‐aggregates

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