Configuration of organic dye excimers in nanoporous SiO 2  matrices

Sorokin, A. V.; Gnap, B.A.; Bespalova, I.I.; Yefimova, Svetlana; Malyukin, Yu. V.

doi:10.1016/j.jlumin.2016.06.025

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…The authors hypothesized that the emission at 680 nm could be due to dimer formation at high laser fluences. In contrast to this, there are also reports indicating triplet formation in cyanine dimers, which can lead to this second emission. − Similarly, the formation of excimers has been observed . It is still unclear what the underlying mechanisms are for additional emission bands in the films.…”

Section: Introductionmentioning

confidence: 98%

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Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films

Anantharaman

Yakunin²,

Peng³

et al. 2017

J. Phys. Chem. C

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Cyanine dye molecules, used as monomers or in aggregate form, find interesting applications in optoelectronic devices. Among the various aggregate species incorporating organic dyes, centrosymmetric dimers are known as nonluminescent. They can act as exciton quenchers due to a low-energy optically forbidden excited state. In this study, however, we show that a dimer species in thin films exhibits efficient and strongly red-shifted photoluminescence. When the films were excited, a monomer emission at 590 nm along with a second emission peak at 680 nm was observed. A close relation between the dye concentration and the emission showed that a new emission at 680 nm corresponds to the dimer emission. Circular dichroism (CD) spectroscopy reveals that a fraction of the dimers exist in a twisted dimer configuration. Stable, long-lived, and quenchable fluorescence with high quantum yield is attributed to this dimer emission.

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Section: Introductionmentioning

confidence: 98%

“…15−17 Similarly, the formation of excimers has been observed. 18 It is still unclear what the underlying mechanisms are for additional emission bands in the films.…”

Section: ■ Introductionmentioning

confidence: 99%

Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films

Anantharaman

Yakunin²,

Peng³

et al. 2017

J. Phys. Chem. C

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Polymer‐Bound Supramolecular J‐Aggregates: Optical Properties and Applications

Sorokin

Yefimova

Malyukin

2018

Encyclopedia of Polymer Science and Technology

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Luminescent molecular aggregates, called J‐aggregates, are an interesting example of supramolecular structures with a number of unique spectral properties. Their optical properties are governed by the excitonic nature resulting from high‐order molecular packing in the J‐aggregate chains. The J‐aggregate characteristic feature is the bathochromically shifted narrow excitonic band termed the J‐band. The optical properties of J‐aggregates are markedly distinct from those of the individual molecules forming the aggregate, namely narrow absorption band, high oscillator strength, giant third‐order susceptibility, resonant luminescence, and effective exciton diffusion. Although solutions of J‐aggregates often possess low photostability for practical usage, their solid samples are more convenient, especially different polymer films due to their ease of preparation and availability of application. J‐aggregate formation in polymer films has both advantages and disadvantages: Some spectral characteristics could degrade, whereas composites creation could modify and improve their optical properties. This article aims to demonstrate how the interaction of J‐aggregates with polymers in both solution and solid film state affects their spectral properties. In addition, examples of composites and devices based on polymer‐bound J‐aggregates are discussed.

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Excimer Emission of Acridine Orange Adsorbed on Gadolinium-Yttrium Orthovanadate Nanoparticles

et al. 2018

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Studying the complexes of inorganic nanoparticles - organic dye molecules is of great importance for their theranostics application. In this paper, we report gadolinium-yttrium orthovanadate nanoparticles (VNPs) - Acridine Orange (AO) complex formation in water solutions. To study the interactions between VNPs and AO, the methods of steady-state and time-resolved spectroscopy were used. It was shown that in aqueous solutions containing VNPs, AO aggregation takes place with a sandwich-like stacking of AO molecules in the near-surface layer of VNPs. The VNPs-AO complex formation causes significant changes in the AO fluorescence spectrum, namely, the appearance of a new broad, structureless band in the long-wavelength spectral edge, which was not observed in AO spectrum in a pure water solution. By analyzing of the absorption, fluorescence excitation spectra and fluorescence decay, the static excimer origin of the long-wavelength fluorescence band has been established.

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Configuration of organic dye excimers in nanoporous SiO 2 matrices

Cited by 5 publications

References 35 publications

Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films

Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films

Polymer‐Bound Supramolecular J‐Aggregates: Optical Properties and Applications

Excimer Emission of Acridine Orange Adsorbed on Gadolinium-Yttrium Orthovanadate Nanoparticles

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