Fast energy transfer in layer-by-layer assembled CdTe nanocrystal bilayers

Franzl, Thomas; Koktysh, Dmitry S.; Klar, Thomas A.; Rogach, Andrey L.; Feldmann, Jochen; Gaponik, Nikolai

doi:10.1063/1.1702136

Cited by 129 publications

(132 citation statements)

References 20 publications

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“…54 The length of the ligand is only taken into account once, as the ligand shells can interpenetrate. 19,54 This minimum separation of 2.7-3.2 nm for QD1, QD2, and QD3 will only be achieved at the highest concentrations and is still a relatively large separation in context of Dexter energy transfer. In contrast the Förster mechanism is less sensitive to the donoracceptor separation than the Dexter mechanism and can occur over longer separation distances.…”

Section: Theoretical Modelingmentioning

confidence: 99%

“…15 Numerous reports have been published on energy transfer in QD structures formed using these techniques among others. [16][17][18][19][20][21][22][23] To date there have been only a few reports investigating the influence of the QD concentration on the optical properties and/or energy transfer in monodispersed QD layers, 16 even though they are the fundamental building blocks of many of the systems and devices highlighted above. It is important to consider the QD concentration when comparing the results reported in different publications; its impact on the signal levels, outcome of measurements and performance of devices has to be determined and taken into account.…”

Section: Introductionmentioning

confidence: 99%

“…[31][32][33] Artificially designed microparticles and nanoparticles with multiple functionality can be synthesized with the help of the LbL technique and have been proposed for applications in areas such as quantum-information processing, optoelectronics, or biotechnology. [34][35][36] As the LbL deposition allows for the positioning of layers in nanometer steps, it is also beneficial for the investigation of energy transfer processes 17,19,21,22 as well as the interaction of surface plasmons with QDs. [37][38][39] Previous research reported in the literature has shown that nanocrystal to nanocrystal energy transfer can be appropriately described using Förster resonant energy transfer theory despite the inhomogeneous broadening of the QD ensembles and their relatively large size compared to the typical Förster radii of 2-10 nm.…”

Section: Introductionmentioning

confidence: 99%

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Influence of quantum dot concentration on Förster resonant energy transfer in monodispersed nanocrystal quantum dot monolayers

et al. 2010

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The quantum dot ͑QD͒ concentration dependence of the optical properties of QD monolayers is shown to be dominated by Förster resonant energy transfer ͑FRET͒ from smaller to larger QDs in the ensemble. With increasing QD concentration a redshift of the peak emission wavelength, a shortening of the photoluminescence lifetime of the QDs on the high-energy side of the ensemble emission spectrum as well as increased difference in the lifetimes on the high-and low-energy sides are observed in the layer-by-layer deposited QD monolayers. There is also evidence of an increased rise time in the time-resolved photoluminescence decays on the low-energy side of the QD emission for two of the three samples presented in most detail. A theory of FRET in two dimensions is applied to explain the lifetime decrease on the high-energy side of the ensemble emission and confirms that the impact of the QD concentration on the optical properties is primarily due to FRET from the smaller to larger QDs in the ensemble. The concentration effects are stronger in QD samples which have a broader emission peak compared to the Stokes shift. Based on good agreement with FRET theory, the QD concentration and the overlap of the QD emission and absorption peaks can both be used to control the efficiency of the FRET process in monodispersed QD layers.

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Section: Theoretical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of quantum dot concentration on Förster resonant energy transfer in monodispersed nanocrystal quantum dot monolayers

et al. 2010

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“…Because the number of separation layers can control the distance between active layers, LbL film is a perfect architecture to study FRET applications. 35 Layer-by-layer deposition of inorganic materials in biological systems is common. Lustrin is a protein with polycationic domains, managing formation of layer-by-layer assembly of aragonite in mollusk shell, 36,37 and similarly silicatein protein is responsible for the formation and assembly of complex silica structures in a diatom, Cylindrotheca fusiformis.…”

Section: à25mentioning

confidence: 99%

Peptide-Mediated Constructs of Quantum Dot Nanocomposites for Enzymatic Control of Nonradiative Energy Transfer

2011

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Biomolecules, especially proteins, peptides, and DNA, which function as the molecular building blocks of biological systems, are of fundamental importance for creating future biogeneration of electronic and photonic devices and sensors in hybrid architectures.1À4 Their unique molecular capabilities in self-assembly make these molecules desired candidates for hybrid applications at the nanoÀbio interface (compared to available synthetic approaches). In nanotechnology applications, great attention has been paid to biohybrid nanomaterial systems to discover new assembly techniques. 5À9 In this context, the interaction of nanoparticles with proteins, peptides, and DNA has been studied for innovative and robust biohybrid designs. 10À12Colloidal semiconductor quantum dots (QDots), also known as nanocrystals, have been utilized in several nano-and biotechnological applications. 13,14 Their attractive electronic and optical properties including size-tunable optical emission, high quantum yield, and photostability enabled these nanoparticles to be exploited in various photonic device platforms. 15 In recent studies, for example, capabilities of QDots have been demonstrated for white light generation and tunability in color-conversion light-emitting diodes. 16,17 With their unique and desirable properties QDots have been one of the most widely studied classes of nanomaterial systems for protein and peptide based systems.18 Quantum dot labeled proteins and peptides promise to be useful as molecular probes in many applications including cancer targeting, 19,20 determination of toxins in food and environmental samples, 21 and detection and quantification of pathogenic microorganisms in food samples. 22 Beyond sensitive biolabeling applications, in the past decade, studies also showed that semiconductor QDots (e.g., CdTe and CdSe) can be utilized in F€ orster-type resonance energy transfer (FRET) processes. Such nonradiative energy transfer directs excitation energy from donor QDots to acceptor QDots in close proximity. 23À25QDots have been widely used in FRET processes in biomolecular systems and many successful applications were demonstrated. In the work reported by Matussi et al., maltose binding proteins labeled with Cy3 dye (emitting at 570 nm) were conjugated to QDots emitting at 510 nm, and the resulting energy transfer between the dye molecules and quantum dots was probed. Upon binding the proteins changed conformation to allow FRET.26 Similar studies were also conducted for the targeted conjugation of QDots with proteins without sacrificing the protein functionality. 27 In another study QDotÀprotein bioconjugates were utilized in building protein arrays for specific recognition of targeted antibodies and elements, where FRET signal was used for robust detection of proteinÀantigen molecule interaction. 28,29 Quenching is another phenomenon used as a signal from QDotÀprotein bioconjugates. This was exploited to detect a drug molecule ABSTRACT: A bottom-up approach for constructing colloidal semiconductor quantum dot ...

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“…12 In thin film devices, different structures and types of NCs have been investigated to improve the energy transfer by using layerby-layer ͑LbL͒ assembly technique, which allows for the sequential arrangement of multilayered micro-to nanoscale structures of NCs. [13][14][15] Franzl et al 16 demonstrated efficient FRET in LbL assembled bilayers of CdTe NCs. In another structure, alternating layers of NCs and polyelectrolytes have been assembled to form a funnel-like bandgap variation toward the center NC layer for efficient energy harvesting.…”

mentioning

confidence: 99%

Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe nanocrystal monolayers

Cicek

Nizamoğlu

Özel

et al. 2009

Applied Physics Letters

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We proposed and demonstrated architectural tuning of color chromaticity by controlling photoluminescence decay kinetics through nonradiative Förster resonance energy transfer in the heterostructure of layer-by-layer spaced CdTe nanocrystal (NC) solids. We achieved highly sensitive tuning by precisely adjusting the energy transfer efficiency from donor NCs to acceptor NCs via controlling interspacing between them at the nanoscale. By modifying decay lifetimes of donors from 12.05 to 2.96 ns and acceptors from 3.68 to 14.57 ns, we fine-tuned chromaticity coordinates from (x,y) = (0.575,0.424) to (0.632, 0.367). This structural adjustment enabled a postsynthesis color tuning capability, alternative or additive to using the size, shape, and composition of NCs. © 2009 American Institute of Physics

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Fast energy transfer in layer-by-layer assembled CdTe nanocrystal bilayers

Cited by 129 publications

References 20 publications

Influence of quantum dot concentration on Förster resonant energy transfer in monodispersed nanocrystal quantum dot monolayers

Influence of quantum dot concentration on Förster resonant energy transfer in monodispersed nanocrystal quantum dot monolayers

Peptide-Mediated Constructs of Quantum Dot Nanocomposites for Enzymatic Control of Nonradiative Energy Transfer

Structural tuning of color chromaticity through nonradiative energy transfer by interspacing CdTe nanocrystal monolayers

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