Dynamics of optical response of solutions of pseudoisocyanine J aggregates upon pico- and subnanosecond excitation

Ermolaeva, G. M.; Маслов, В. Г.; Орлова, А. О.; Panfutova, A. S.; Rosanov, N. N.; Fainberg, B. D.; Shakhverdov, T. A.; Shilov, V. B.

doi:10.1134/s0030400x11060075

Cited by 9 publications

(10 citation statements)

References 25 publications

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“…Note that the latter is much less than the measurement accuracy and should be used as an estimation only. A similar significant quantum yield decrease was observed for PIC J-aggregates as a result of their interaction with polyvinyl sulfate (PVS) polyanions both in an aqueous solution and in spin-coated films. , Note the quantum yield of PIC J-aggregates in the solutions is similar to that reported in refs , , and . In the case of J-aggregates in the LbL film, the quantum yield of PIC J-aggregates is much less as compared to η PVS ∼ 0.02 for the J-aggregates in the PVS spin-coated films. , …”

Section: Resultssupporting

confidence: 78%

“…In the aqueous solution, the monoexponential decay was obtained with lifetime τ sol ∼ 1.39 ± 0.01 ns (Figure c, blue curve). Note that mostly nonexponential decay is reported for PIC J-aggregates with two-exponential fitting and average lifetime of 400–600 ps. ,− The data appear to be strongly dependent on PIC concentration, excitation wavelength, and excitation intensity . One more reason effecting the decay profile could be the J-aggregate photostability.…”

Section: Resultsmentioning

confidence: 96%

“…PIC J-aggregates appeared to be very sensitive to the formation conditions . Therefore, there are essential discrepancies in literature data concerning their spectral characteristics such as J-band widths, fluorescence lifetimes, and fluorescence quantum yields even for similar aqueous solutions. − ,,− So, we have to compare spectral properties of PIC J-aggregates formed in polymer LbL films with their properties in an aqueous solution used for the film preparation. In an aqueous NaCl (0.2 M) solution, PIC J-aggregates at the used dye concentration ( C = 0.5 mM) exhibit a typical absorption spectrum with an intense J-band (λ max = 574 nm, Δ ν fwhm = 180 cm –1 ), clearly distinguishable H-band (λ max = 493 nm), and a monomer band (λ max = 525 nm) (Figure a, blue curve).…”

Section: Resultsmentioning

confidence: 99%

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Metal-Enhanced Fluorescence of Pseudoisocyanine J-Aggregates Formed in Layer-by-Layer Assembled Films

et al. 2015

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A formation of pseudoisocyanine (PIC) dye Jaggregates in the polyelectrolyte film by the layer-by-layer (LbL) assembly method has been studied. It has been shown that this process leads to significant J-band widening and fluorescence quenching as a result of increasing static disorder. To enhance the J-aggregate fluorescence properties, the effect of J-aggregate interaction with plasmon resonances of gold nanoparticles has been used. It is found that the maximal 8-fold fluorescence enhancement for PIC J-aggregates in the LbL films could be achieved at 16 nm distance between Au nanoparticles (NPs) and the J-aggregates. Plasmon influence on the J-aggregate fluorescence has been analyzed using a two-level system in the local plasmon field approximation. The model gives a good correlation with the experimental results and could be used for further studying the exciton−plasmon interaction in J-aggregates. ■ INTRODUCTIONWell-ordered molecular nanoclusters called J-aggregates attract great attention due to their unique optical properties, distinctly different from those of the individual molecules constituting the aggregate: narrow absorption band, high oscillator strength, giant third-order susceptibility, resonant fluorescence, etc. 1−4 Such optical properties of J-aggregates are explained by the strong interactions between the molecules within the aggregates. 1−4 The resulting delocalization of electronic excitations over certain molecules on the chain leads to the formation of collective eigenstates for all molecules, the exciton state (Frenkel exciton formation). 1−5 Depending on a type of molecular packing within the aggregate chain, one can observe a blue-shifted exciton band (H-band, the "face-to-face" arrangement), a red-shifted band (J-band, the "face-to-tail" arrangement), or both J-and H-bands due to the "herringbone"-type molecular packing. 1−4 The distinct feature of J-aggregates is a close correlation between J-aggregate excitonic properties and structure that opens up possibilities for the manipulation of J-aggregate optical characteristics by changing the condition of nanocluster formation. 1−4 Jaggregates have proved themselves as a perspective material for a number of applications such as photography, nonlinear optical devices, optical memory, and some others. 1−8 Low photostability in solutions resulting in photodegradation and photoreorganization processes is a considerable disadvantage of J-aggregates. 9,10 One of the ways to overcome this problem is using solid samples of J-aggregates especially in the form of polymer films suitable for many applications. 11−13 There are two main ways to form J-aggregates in polymer films: spin-coating 11−16 and layer-by-layer assembly (LbL). 17−19 Unfortunately, both ways cause a significant decrease in Jaggregate fluorescence quantum yield. 15,16,19 So, special efforts should be made to increase the fluorescence quantum yield of Jaggregates formed in polymer films.A very attractive way to improve the optical properties of Jaggregates is using the effect of ...

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Metal-Enhanced Fluorescence of Pseudoisocyanine J-Aggregates Formed in Layer-by-Layer Assembled Films

et al. 2015

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“…Multiexponential PL decay is often observed in J-aggregates of cyanine dyes [9,13], and can be explained in terms of a distribution of exciton delocalization lengths in the sample [13] or by contribution of indirect excitation process [14]. Shortening of PL lifetimes upon aggregation (Fig.…”

Section: Formation Of J-aggregates Triggered By Polyelectrolytementioning

confidence: 98%

Optical resonators with Whispering Gallery Modes and J-aggregates

Melnikau

Savateeva

Rusakov

et al. 2013

2013 15th International Conference on Transparent Optical Networks (ICTON)

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“…The pseudoisocyanine (PIC) molecular aggregates, where the J-aggregate behavior was first discovered, have radiative lifetime of 1.5 ns. 38 J-aggregate behavior can also be achieved in crystals of aromatic molecules, where some small molecules that host Frenkel excitons can directly crystallize into J aggregates (e.g., 2,6-diphenylanthracene). 39 For large conjugated molecules, bulky side chains can be used to reduce the charge-transfer exciton and facilitate the desirable molecular packing geometry.…”

Section: Radiative Lifetime Of Different Materialsmentioning

confidence: 99%

Molecular Materials with Short Radiative Lifetime for High-Speed Light-Emitting Devices

Zhao

Wang

Javey

2020

Matter

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Dynamics of optical response of solutions of pseudoisocyanine J aggregates upon pico- and subnanosecond excitation

Cited by 9 publications

References 25 publications

Metal-Enhanced Fluorescence of Pseudoisocyanine J-Aggregates Formed in Layer-by-Layer Assembled Films

Metal-Enhanced Fluorescence of Pseudoisocyanine J-Aggregates Formed in Layer-by-Layer Assembled Films

Optical resonators with Whispering Gallery Modes and J-aggregates

Molecular Materials with Short Radiative Lifetime for High-Speed Light-Emitting Devices

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