Multiplet structure of aggregated states in 1,1′-diethyl-2,2′-cyanine dye

Cooper, W.

doi:10.1016/0009-2614(70)80252-4

Cited by 95 publications

(39 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This picture agrees with the measurements of Sorokin et al, who report that topological disorder and exciton–phonon coupling result in exciton self-trapping in films of PIC, observed as an increase in nonradiative relaxation and decrease in the luminescence quantum yield . Photoluminescence measurements of PIC aggregates in solution by Cooper also support this picture . The fluorescence band was observed to split into two peaks at cryogenic temperatures.…”

Section: Results and Discussionsupporting

confidence: 91%

In Situ Measurement of Exciton Dynamics During Thin-Film Formation Using Single-Shot Transient Absorption

Wilson

Wong

2018

J. Phys. Chem. A

View full text Add to dashboard Cite

The exciton dynamics of pseudoisocyanine (PIC) is reported during the formation of a thin film dropcast from solution. Tilted pump pulses are used to spatially encode a pump-probe time delay, enabling the collection of a transient in a single shot. We demonstrate that a spatially encoded delay can be used to accurately measure exciton dynamics in thin-film samples, with a signal-to-noise ratio above 20 attained in 2 s. We report in situ linear absorption, fluorescence, and transient absorption measurements during the molecular aggregation of PIC. These measurements reveal a highly fluorescent intermediate stage during thin-film formation that we ascribe to J-aggregates, in contrast to the final, less fluorescent, dry thin film that exhibits photophysics indicative of disordered J-aggregates. The ability to measure exciton dynamics in situ during materials formation will provide a deeper understanding of how functional materials properties evolve, and will enable direct feedback for rational materials design.

show abstract

Section: Results and Discussionsupporting

confidence: 91%

In Situ Measurement of Exciton Dynamics During Thin-Film Formation Using Single-Shot Transient Absorption

Wilson

Wong

2018

J. Phys. Chem. A

View full text Add to dashboard Cite

show abstract

“…In aqueous ammonia (1 wt %) solution, PIC monomers exhibit an absorption maximum at 525 nm along with two shoulder bands at 490 and 463 nm corresponding to the different vibronic transitions of the dye (Figure 1a). 34 The PIC dyes spontaneously self-assemble into coupled dye aggregates on the LCA template in aqueous ammonia (1 wt %) solution.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The reports on the formation of H-type aggregates of PIC dyes are limited in the literature. 34 W. Cooper 34 earlier attributed the higher energy bands of PIC at 465 and 458 nm (resolved at 173 K) to the absorption peaks of the trimeric and tetrameric form of the PIC dye. Therefore, the highly blue-shifted strong absorption band at 420 nm observed in this work can be attributed to the strong coupling between the dyes in the higher ordered H-aggregates of PIC.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…DNA-templated PIC J-aggregates have been shown as a potential building block for programmed excitation energy transport . While the reports on the fluorescent J-aggregate formation of cyanine dyes and their opto-electronic applications are extensive, only limited effort has been made on understanding the detailed exciton properties of emissive H-type dye aggregates. − Moreover, the efforts to control the J- and H-type electronic coupling in the self-assembled aggregates of a dye on a particular template are also limited . Template-directed controlling and switching of the electronic coupling between the dyes in strongly coupled dye aggregates having strong optical response and exciton fluorescence are very important for building template-based excitonic networks with programmed coherent dynamics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanotube Template-Directed Formation of Strongly Coupled Dye Aggregates with Tunable Exciton Fluorescence Controlled by Switching between J- and H-Type Electronic Coupling

2021

View full text Add to dashboard Cite

Strongly coupled dye aggregates with tailored exciton properties may find their use in developing artificial light-harvesting and optoelectronic devices. Here, we report the control of tubular pseudoisocyanine (PIC) dye J-and H-aggregate formation with tunable exciton fluorescence using lithocholic acid (LCA) as a template. The LCA-templated PIC Jaggregate nanotubes formed at a higher LCA/PIC molar ratio (≥5:1) exhibit a sharp, red-shifted absorption band (at 555 nm), intense fluorescence (at 565 nm), and shorter lifetime (200 ps), all indicating their strong superradiance properties. In contrast, the H-aggregate nanotubes formed at a lower LCA/PIC molar ratio (2:1) exhibit a significantly blue-shifted absorption band (at 420 nm) and highly red-shifted fluorescence emission (at 600 nm) with enhanced lifetime (4.40 ns). The controlled switching of the optical properties of the PIC dye aggregates achieved by controlling the LCA/PIC molar ratio could serve as an important guideline for the design of organic photo-functional materials.

show abstract

“…The coupling constant of this phonon, on the other hand, is off by nearly a factor three (153/2 = 76. 5 …”

Section: Radiative Decay and Optical Dephasingmentioning

confidence: 97%

Collective optical response of molecular aggregates

Fidder

Wiersma

1995

Physica Status Solidi (b)

View full text Add to dashboard Cite

Relative fluorescence quantum yield, fluorescence lifetime, optical dephasing, and absorption line shift data are presented for both excitonic transitions of the pseudoisocyanine (PIC) J-aggregate. The data indicate activation of the optical dephasing by exciton-acoustic phonon scattering at low temperatures. Above approximately 80 K the optical dephasing, line shift as well as the fluorescence lifetime lengthening call for activation by high frequency phonons. Moreover, resonance Raman data indicate the delocalization of low frequency vibrational modes in the aggregate.

show abstract

Multiplet structure of aggregated states in 1,1′-diethyl-2,2′-cyanine dye

Cited by 95 publications

References 6 publications

In Situ Measurement of Exciton Dynamics During Thin-Film Formation Using Single-Shot Transient Absorption

In Situ Measurement of Exciton Dynamics During Thin-Film Formation Using Single-Shot Transient Absorption

Nanotube Template-Directed Formation of Strongly Coupled Dye Aggregates with Tunable Exciton Fluorescence Controlled by Switching between J- and H-Type Electronic Coupling

Collective optical response of molecular aggregates

Contact Info

Product

Resources

About