FRET from core and core–shell quantum dots to laser dye: A comparative investigation

Adarsh, K. S.; Singh, Mahavir; Shivkumar, M. A.; Rabinal, M. K.; Jagatap, B. N.; Mulimani, B. G.; Savadatti, M. I.; Inamdar, Sanjeev R.

doi:10.1016/j.jlumin.2014.12.014

Cited by 13 publications

(6 citation statements)

References 37 publications

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“…As energy donors or acceptors, QDs have several advantageous characteristics enumerated in previous reviews of this subject, − including the following: spectrally narrow, continuously tunable emission, which allows for optimization of the spectral overlap of donor and acceptor; broad absorption spectra, which provide flexibility in choice of excitation wavelength for donors, and make QDs easily utilized as acceptors; and resistance to photobleaching. The relatively large two-photon cross sections (10–10000 GM − ) and the ability to mediate nonlinear processes such as multiple exciton generation and Auger recombination make QDs potentially useful as chromophores for upconversion and downconversion of photons. ,,− Reported EnT partners for QDs include other QDs and molecules, such as organic dyes, − J-aggregates of organic dyes, , metal coordination complexes, ,− conjugated polymers, − carbon nanomaterials, , quantum wells, − metal ions, − and metal nanoparticles. − …”

Section: Role Of Molecules In Energy and Charge Transfer Involving Co...mentioning

confidence: 99%

Electronic Processes within Quantum Dot-Molecule Complexes

et al. 2016

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The subject of this review is the colloidal quantum dot (QD) and specifically the interaction of the QD with proximate molecules. It covers various functions of these molecules, including (i) ligands for the QDs, coupled electronically or vibrationally to localized surface states or to the delocalized states of the QD core, (ii) energy or electron donors or acceptors for the QDs, and (iii) structural components of QD assemblies that dictate QD-QD or QD-molecule interactions. Research on interactions of ligands with colloidal QDs has revealed that ligands determine not only the excited state dynamics of the QD but also, in some cases, its ground state electronic structure. Specifically, the article discusses (i) measurement of the electronic structure of colloidal QDs and the influence of their surface chemistry, in particular, dipolar ligands and exciton-delocalizing ligands, on their electronic energies; (ii) the role of molecules in interfacial electron and energy transfer processes involving QDs, including electron-to-vibrational energy transfer and the use of the ligand shell of a QD as a semipermeable membrane that gates its redox activity; and (iii) a particular application of colloidal QDs, photoredox catalysis, which exploits the combination of the electronic structure of the QD core and the chemistry at its surface to use the energy of the QD excited state to drive chemical reactions.

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Section: Role Of Molecules In Energy and Charge Transfer Involving Co...mentioning

confidence: 99%

Electronic Processes within Quantum Dot-Molecule Complexes

et al. 2016

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Section: Resultsmentioning

confidence: 99%

“…The quantum yields ( φ s ) of the QDs were experimentally determined by comparison with standard fluorescent dyes of known quantum yield (coumarin 307, 0.56; rhodamine 110, 0.92; rhodamine B, 0.65) using the following relation :

φ_{s} = φ_{R} \frac{I_{s}}{I_{R}} \frac{O D_{R}}{O D_{s}} \frac{n_{s}^{2}}{n_{R}^{2}}

where I is the integrated fluorescence emission intensity, OD is the absorbance at the wavelength of excitation, n is the refractive index of the solvent and φ is the quantum yield. Subscripts S and R refer to sample and reference, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Absorption and fluorescence spectra of CdSeS/ZnS QDs (donor) and CV dye (acceptor) dissolved in double-distilled water were obtained at room temperature with a UV/visible absorption spectrophotometer (HITACHI, model U-2800, Tokyo, Japan) and a fluorescence spectrophotometer (Horiba, model Floromax-4, Edison, NJ, USA), respectively. The quantum yields (φ s ) of the QDs were experimentally determined by comparison with standard fluorescent dyes of known quantum yield (coumarin 307, 0.56; rhodamine 110, 0.92; rhodamine B, 0.65) using the following relation (27,28):…”

Section: Methodsmentioning

confidence: 99%

“…Note that the origin of multiexponential emission decay of semiconductor QDs still remains a matter of debate. Faster process reflects radiative decay arising from relaxation of excited electron to ground state and can be attributed to the initially populated core-shell recombination, although the possible origin of long lived decay components remains relatively uncertain (27,(35)(36)(37). Several groups have studied the decay components of the alloyed QDs (13,(38)(39)(40) and suggested that the relative contributions of time constants vary with changing composition.…”

Section: Time-resolved Measurementsmentioning

confidence: 99%

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Spectroscopic investigation of alloyed quantum dot‐based FRET to cresyl violet dye

et al. 2015

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Quantum dots (QDs), bright luminescent semiconductor nanoparticles, have found numerous applications ranging from optoelectronics to bioimaging. Here, we present a systematic investigation of fluorescence resonance energy transfer (FRET) from hydrophilic ternary alloyed quantum dots (CdSeS/ZnS) to cresyl violet dye with a view to explore the effect of composition of QD donors on FRET efficiency. Fluorescence emission of QD is controlled by varying the composition of QD without altering the particle size. The results show that quantum yield of the QDs increases with increase in the emission wavelength. The FRET parameters such as spectral overlap J(λ), Förster distance R0, intermolecular distance (r), rate of energy transfer k(T)(r), and transfer efficiency (E) are determined by employing both steady-state and time-resolved fluorescence spectroscopy. Additionally, dynamic quenching is noticed to occur in the present FRET system. Stern-Volmer (K(D)) and bimolecular quenching constants (k(q)) are determined from the Stern-Volmer plot. It is observed that the transfer efficiency follows a linear dependence on the spectral overlap and the quantum yield of the donor as predicted by the Förster theory upon changing the composition of the QD.

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Steady State and Time Resolved Spectroscopic Study of CdSe and CdSe/ZnS QDs:FRET Approach

et al. 2016

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This article highlights some physical studies on the relaxation dynamics and Förster resonance energy transfer (FRET) of semiconductor quantum dots (QDs) to proximal dye molecule and the way these phenomena change with core to core-shell QD is discussed. Efforts to understand the optical and carrier relaxation dynamics of CdSe and CdSe/ZnS QDs are made by using absorption, steady-state fluorescence and time-resolved fluorescence (TCSPC) techniques. Steady-state as well as time-resolved fluorescence measurements were employed to evaluate the QD PL quenching induced by the proximal Rhodamine 101 dye molecule and to examine the influence of deep trap states on energy transfer efficiency. The FRET parameters such as spectral overlap, Förster distance, intermolecular distance for each donor-acceptor pair are determined and variation of these parameters from core to core-shell QD is discussed.

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FRET from core and core–shell quantum dots to laser dye: A comparative investigation

Cited by 13 publications

References 37 publications

Electronic Processes within Quantum Dot-Molecule Complexes

Electronic Processes within Quantum Dot-Molecule Complexes

Spectroscopic investigation of alloyed quantum dot‐based FRET to cresyl violet dye

Steady State and Time Resolved Spectroscopic Study of CdSe and CdSe/ZnS QDs:FRET Approach

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