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Effect of shell thickness and composition on blinking suppression and the blinking mechanism in 'giant' CdSe/CdS nanocrystal quantum dots
2010
Journal of Biophotonics
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Suppressed blinking behaviour afforded by this class of semiconductor nanocrystal yields new statistical relationships in the probability densities of fluorescence on-and off-time distributions (right) ...
We clarify the dependence of blinking behavior and photostability on shell thickness, as well as on interrogation times. ...
Acknowledgments This work was conducted in part in the Center for Integrated Nanotechnologies (CINT) jointly operated by Los Alamos and Sandia National Laboratories (LANL and SNL) for the U.S. ...
doi:10.1002/jbio.201000058
pmid:20626004
pmcid:PMC2943988
fatcat:zdabx43eurgubc4tlqpryhwqn4
Correlated blinking of fluorescent emitters mediated by single plasmons
2017
Physical Review A
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Single-plasmons are created on the latter from the quantum dot, and transfer energy to excite in turn the fluorescent nanobead. ...
In this Letter we report on a first crucial step towards this goal by the observation of correlated emission between a single CdSe/CdS/ZnS quantum dot exhibiting single photon statistics and a fluorescent ...
For the growth of the CdS shell, A SILAR method is used, where we successively introduce precursor for Cd and S. 4 mL of the previous solution of CdSe core are mixed with 16 mL of octadecene and 10 mL ...
doi:10.1103/physreva.95.033828
fatcat:ea6sng4hijertgj6nejqstcmme
Influence of the Inner-Shell Architecture on Quantum Yield and Blinking Dynamics in Core/Multishell Quantum Dots
2016
ChemPhysChem
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However, this introduces multiple interfaces and their relative effects on quantum yield and blinking are not yet fully understood. ...
Choosing the composition of the shell for QDs is not trivial, since both the band-edge energy offset and interfacial lattice mismatch play roles in influencing the final optical properties. ...
Acknowledgments Generous financial support by the NSF (CHE-1255440), the NIH (COBRE P30 GM103450), and the Arkansas Biosciences Institute is gratefully acknowledged. ...
doi:10.1002/cphc.201500868
pmid:26693950
pmcid:PMC5086001
fatcat:dgrvr5k3hbblpbdt4i2bbbjfoi
Midazolam effects on prepulse inhibition of the acoustic blink reflex
1999
British Journal of Clinical Pharmacology
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This relationship was described by a sigmoidal E max model, giving an E max of 0.65±0.13, an ED 50 of 33.9±10.9 ng ml −1 and gamma of 3.5±1.0. ...
The magnitude of PPI was calculated by dividing the EMG response to nonprepulsed stimuli by the response to prepulsed stimuli for each individual and period. ...
has been found to reduce PPI in animal research [26] . and critical review of the manuscript. Other sedatives, such as ethanol, did not impact PPI [27]. ...
doi:10.1046/j.1365-2125.1999.00896.x
pmid:10233207
pmcid:PMC2014234
fatcat:xt7up3rbnveo3glrylcaiebizy
All-optical fluorescence blinking control in quantum dots with ultrafast mid-infrared pulses
[article]
2021
arXiv
pre-print
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Despite efforts for blinking reduction via chemical engineering of the QD architecture and its environment, blinking still poses barriers to the application of QDs, particularly in single-particle tracking ...
Here, we demonstrate the first deterministic all-optical suppression of quantum dot blinking using a compound technique of visible and mid-infrared (MIR) excitation. ...
The blinking OFF-time distribution is almost unaffected in 14 ML QDs, while the ON-time distribution is altered at 1 second and at its harmonics, contrary to the nearly unaffected ON-time distribution ...
arXiv:2105.01190v1
fatcat:7djzsiaomraxrm746i44zhws4u
Reduced Blinking and Long-Lasting Fluorescence of Single Fluorophores Coupling to Silver Nanoparticles
2008
Langmuir
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A power-law distribution of off time population was observed for single Cy5 molecules. ...
The blinking behavior of single Cy5 molecules was investigated and compared in the absence and the presence of silver nanostructures. ...
Acknowledgments This work was supported by the NCRR, RR-08119 and NHGRI, HG-002655, EB000682, EB0065211 and NIBIB. ...
doi:10.1021/la702673p
pmid:18278953
pmcid:PMC2730019
fatcat:n3amwbfr5za4lpybaeesxfvsmy
Compact high-quality CdSe–CdS core–shell nanocrystals with narrow emission linewidths and suppressed blinking
2013
Nature Materials
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High particle uniformity, high photoluminescence quantum yields, narrow and symmetric emission spectral lineshapes and minimal single dot emission intermittency (known as blinking) have been recognized ...
We anticipate that this new generation of QDs will also result in significant improvement in the performance of QDs in other applications such as solid-state lighting and illumination. . ...
Acknowledgements The work received support from the NIH through grants 5-U54-CA119349 (M.G.B.) and 5R01CA126642 (M.G.B., D.F., R. J.), the ARO through the Institute for Soldier Nanotechnologies ...
doi:10.1038/nmat3539
pmid:23377294
pmcid:PMC3677691
fatcat:kycgyp33wjgbzgezh45mdojagy
Pump-Intensity- and Shell-Thickness-Dependent Evolution of Photoluminescence Blinking in Individual Core/Shell CdSe/CdS Nanocrystals
2011
Nano letters (Print)
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We show that while at low pump intensities PL blinking in thin-shell (4À7 monolayers, MLs) NQDs can be described by random switching between two states of high (ON) and low (OFF) emissivities, it changes ...
Further, our data indicate that highly stable, blinking-free PL of thick-shell (15À19 MLs) NQDs ("giant" or g-NQDs) is characterized by nearly perfect Poisson statistics, corresponding to a narrow, shot-noise ...
In the case of the thickest shells (15À19 MLs), blinking-free PL with a narrow distribution of intensities is observed for all pump fluencies. ...
doi:10.1021/nl2025272
pmid:22098269
pmcid:PMC3392898
fatcat:xsnkreivnjd7rlqjsyqeqwhax4
Two types of luminescence blinking revealed by spectroelectrochemistry of single quantum dots
2011
Nature
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binning time, binary blinking is observed. d, For fluctuations much faster than the bin size, a continuous distribution of intensities and lifetimes is obtained, often referred to as flickering. ...
A convenient tool for the analysis of correlations between photoluminescence intensities and lifetimes is a fluorescence lifetime-intensity distribution (FLID) representation. ...
To illustrate the variability in blinking behaviours, we present the data collected for this nanocrystal on two different days. ...
doi:10.1038/nature10569
pmid:22071764
pmcid:PMC3390028
fatcat:kobxxsdmqfhlddbyz62zweswwy
In Vitro Spoilation of Silicone-Hydrogel Soft Contact Lenses in a Model-Blink Cell
2015
Optometry and Vision Science
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The model-blink cell provides a reliable laboratory tool for screening new antifouling lens materials, surface coatings, and care solutions. ...
Fouled deposits appear on the lenses after cycling, and their compositions and spatial distributions are subsequently analyzed by optical microscopy, laser ablation electrospray ionization mass spectrometry ...
We thank Colin Cerretani for discussion, Rachel Segalman for use of the optical microscope, Tatiana Svitova for the design of the lipid-extraction experiment, and David Liu for conducting FCSLM. ...
doi:10.1097/opx.0000000000000625
pmid:26083462
fatcat:wacjs6ushfeppbx6k3zw24ygim
On/off blinking and switching behaviour of single molecules of green fluorescent protein
1997
Nature
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These conjectures are supported by our infrared spectra and by analogy with the porphyrin system 1 . ...
As the {½WZnRu III 2 ðOHÞðH 2 OÞÿðZnW 9 O 34 Þ 2 } 11 Ϫ compound is only catalytically active after a long induction period, we propose slow formation of a ruthenium(IV)-oxo species, followed by fast reaction ...
Sorokin for the sample of 1,3-adamantane-d2. This work was supported Acknowledgements. We thank L. S. B. Goldstein and S. Kummer for discussions. This work was supported by the NSF. ...
doi:10.1038/41048
pmid:9237752
fatcat:ih5mkdm6jrf2hjbk4ot4z4tzxa
Charge-tunnelling and self-trapping: common origins for blinking, grey-state emission and photoluminescence enhancement in semiconductor quantum dots
2016
Nanoscale
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Modelling quantum dot blinking, grey-states and photoluminescence enhancement within a charge-tunnelling and self-trapping description of exciton-carrier dynamics. ...
For a typical ZnS shell of 2 monolayers (ML) and lattice spacing 0.31 nm, R s = 2.62 nm and the hole trapping probability, p = 0.2, compares favorably with models elsewhere. 20 Blinking statistics generated ...
transition that occurs after this time in a probabilistic manner and is particularly suited to the highly distributed kinetics of QD blinking, where on-and off-states can persist for long periods >10 ...
doi:10.1039/c6nr00529b
pmid:27088542
fatcat:esszdhynu5ekbczfvby7unyosq
Determination of molecular stoichiometry without reference samples by analyzing fluorescence blinking with and without excitation synchronization
2015
Methods and Applications in Fluorescence
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The fluorescence blinking is measured under two different excitation regimes, on the 2 same setup, and in one and the same sample. ...
Moreover, for quantitative fluorescence studies, it is often useful to know the number of fluorophores labeled onto the molecules studied. ...
F t F t F t F t F F t F t F F t F t F F F t F t F G Here, < > brackets denote time average, and G fast () signifies the part of the correlation function originating from the photophysically generated ...
doi:10.1088/2050-6120/3/2/025001
pmid:29148486
fatcat:3wqreu653nhyzdi6b3pm5rpskm
Effects of subthalamic deep brain stimulation on blink abnormalities of 6-OHDA lesioned rats
2015
Journal of Neurophysiology
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These data show that the 6-OHDA lesioned rat is an ideal model system for investigating the neural bases of reflex abnormalities in PD and highlight the complexity of PD's effects on motor control, by ...
At 130 Hz, but not 16 Hz, STN DBS eliminates reflex blink hyperexcitability and restores both short-and long-term blink plasticity. ...
G: mean peak power of the fast Fourier transform of the autocorrelation of blink occurrence for normal data (black bar) and shuffled data (open bar) for Control and 6-OHDA lesioned rats with and without ...
doi:10.1152/jn.01072.2014
pmid:25673748
pmcid:PMC4455559
fatcat:ibyaphhkd5empb5ej5jq6oxjfi
Biexciton Quantum Yield Heterogeneities in Single CdSe (CdS) Core (Shell) Nanocrystals and Its Correlation to Exciton Blinking
2012
Nano letters (Print)
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More specifically, we measure the photoluminescence blinking and BX quantum yields (QYs) and study the correlation between these two measurements for single core (shell) CdSe (CdS) nanocrystals (NCs). ...
To explain our results, we propose a model that combines both trapping and an Auger mechanism for BX recombination. ...
(a-b) Blinking "on" time fraction distribution for QD593 (a) and QD624 (b). ...
doi:10.1021/nl3013727
pmid:22871126
pmcid:PMC3482465
fatcat:rwwuperxlrcrjlrldgau33oe7m
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