Forward and reverse electronic energy transport and trapping in solution. I. Theory

Kułak, Leszek; Bojarski, C.

doi:10.1016/0301-0104(94)00326-6

Cited by 28 publications

(14 citation statements)

References 64 publications

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“…40,41 This was attributed to the exciton hopping among dye chromophores and quenching via nonemissive dye dimers. Theoretically, Loring, Anderson, and Fayer developed a model of homo-FRET systems and showed that these systems are prone to strong quenching due to trapping.…”

Section: Resultsmentioning

confidence: 99%

Stacking in Colloidal Nanoplatelets: Tuning Excitonic Properties

et al. 2014

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Cataloged from PDF version of article.Colloidal semiconductor quantum wells, also commonly known as nanoplatelets (NPLs), have arisen among the most promising materials for light generation and harvesting applications. Recently, NPLs have been found to assemble in stacks. However, their emerging characteristics essential to these applications have not been previously controlled or understood. In this report, we systematically investigate and present excitonic properties of controlled column-like NPL assemblies. Here, by a controlled gradual process, we show that stacking in colloidal quantum wells substantially increases exciton transfer and trapping. As NPLs form into stacks, surprisingly we find an order of magnitude decrease in their photoluminescence quantum yield, while the transient fluorescence decay is considerably accelerated. These observations are corroborated by ultraefficient Forster resonance energy transfer (FRET) in the stacked NPLs, in which exciton migration is estimated to be in the ultralong range (>100 nm). Homo-FRET (i.e., FRET among the same emitters) is found to be ultraefficient, reaching levels as high as 99.9% at room temperature owing to the close-packed collinear orientation of the NPLs along with their large extinction coefficient and small Stokes shift, resulting in a large Forster radius of similar to 13.5 nm. Consequently, the strong and long-range homo-FRET boosts exciton trapping in nonemissive NPLs, acting as exciton sink centers, quenching photoluminescence from the stacked NPLs due to rapid nonradiative recombination of the trapped excitons. The rate-equation-based model, which considers the exciton transfer and the radiative and nonradiative recombination within the stacks, shows an excellent match with the experimental data. These results show the critical significance of stacking control in NPL solids, which exhibit completely different signatures of homo-FRET as compared to that in colloidal nanocrystals due to the absence of inhomogeneous broadening

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Section: Resultsmentioning

confidence: 99%

Stacking in Colloidal Nanoplatelets: Tuning Excitonic Properties

et al. 2014

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“…Over past several years rapid progress in the theoretical description of excitation energy transport in two-component systems has been made by taking into account not only forward, but also reverse energy transfer [1][2][3][4][5][6][7][8][9]. This effect has been confirmed experimentally in inodel donor-acceptor systems [9][10][11][12][13] as well as in monomer-fluorescent dimer systems [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The task of our paper is achieved by comparing between the concentration courses of the experimental quantum yield and those obtained by means of the Monte-Carlo simulation. Since the fluorescence is emitted by both forms in a similar spectral region a comparison to recently developed self-consistent diagrammatic theory (SCDM), which assumes that only donors of energy are excited and only light from their fluorescence characteristics is recorded [6][7][8][9], would be complicated. Suitable adaptations to this theory are in progress and an appropriate study will be reported separately.…”

Section: Introductionmentioning

confidence: 99%

Excitation Energy Transport between the Ionic Forms of Rhodamine B in Viscous Solutions

Bojarski

Kułak

1998

Acta Phys. Pol. A

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Excitation energy transport between zwitterion and cationic form of rhodamine B in glycerol-ethanol mixture is studied. Concentration course of the quantum yield exhibits a rapid drop at intermediate concentrations, where no dimers are formed contrary to the results of measurements carried out for solutions with a trace amount of acid or base in which single ionic forms are adopted. To describe properly such concentration behavior of the quantum yield forward and reverse, nonradiative excitation energy transport between the forms is considered. This task is performed by comparing experimental data with Monte-Carlo simulations.

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“…In 1995 SCDM was extended by Kułak and Bojarski [128,129] by also taking into account reverse electronic excitation energy transfer from acceptors to donors (RET model). In the RET model the dynamics of excitation is described by a master equation which incorporates reverse and forward excitation energy transfer and trapping in threedimensional disordered two-component system.…”

Section: Self-consistent Diagrammatic Model (Scdm)mentioning

confidence: 99%

“…In this model a new diagrammatic method of summing up diagrams based on its fractal like structure has been applied and the following expressions for luminescence observables have been found [128,129]:for donor emission anisotropy:…”

Section: Self-consistent Diagrammatic Model (Scdm)mentioning

confidence: 99%

Resonance energy transfer between FMN molecules in the presence of dimers: A review

Grajek

2015

Journal of Molecular Liquids

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Forward and reverse electronic energy transport and trapping in solution. I. Theory

Cited by 28 publications

References 64 publications

Stacking in Colloidal Nanoplatelets: Tuning Excitonic Properties

Stacking in Colloidal Nanoplatelets: Tuning Excitonic Properties

Excitation Energy Transport between the Ionic Forms of Rhodamine B in Viscous Solutions

Resonance energy transfer between FMN molecules in the presence of dimers: A review

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