Emission of quantum dots. Medical search. Frequent questions

A team of researchers at the National Institute of Standards and Technology (NIST) has shown that by bringing gold nanoparticles close to the dots and using a DNA template to control the distances, the intensity of a quantum dot's fluorescence can be predictably increased or decreased. (materialstoday.com)
The researchers looked at two types of nanoparticles, quantum dots, which glow with fluorescent light when illuminated, and gold nanoparticles, which have long been known to enhance the intensity of light around them. (materialstoday.com)
They also showed that they could exactly predict the lifetime of the fluorescence of the quantum dot depending on the size of the nearby gold nanoparticles. (materialstoday.com)
Carbon quantum dots also commonly called carbon dots (abbreviated as CQDs, C-dots or CDs) are carbon nanoparticles which are less than 10 nm in size and have some form of surface passivation. (wikipedia.org)
Quantum dots are semiconductor nanoparticles that exhibit remarkable optical and electronic properties due to their extremely small size. (kget.com)
The approach is based on encapsulating semiconductor quantum dots - nanoparticles approximately one billionth of a meter in size -- and engineering their surfaces so they efficiently emit visible light when excited by near-ultraviolet (UV) light-emitting diodes (LEDs). (sciencedaily.com)
Quantum Dots are artificial nanoparticles that have semi-conductor properties. (researchandmarkets.com)

These materials, called colloidal semiconductor quantum dot nanocrystals, can emit any color of light, depending on their exact size or composition. (rdworldonline.com)
Colloidal quantum dot devices demonstrating electrically pumped amplified spontaneous emission are described, showing strong, broadband optical gain and bright edge emission, opening the path to solution-processable laser diodes. (nature.com)
The photoluminescence dynamics of colloidal CdSe/ZnS/streptavidin quantum dots were studied using time-resolved single-molecule spectroscopy. (princeton.edu)
Jie Bao, a former MIT postdoc and currently a Visiting Associate in Physics at Caltech, suggests that colloidal quantum dot materials can be applied to a sensor array using a variety of techniques, including ink jet printing or direct printing, which would be quite cost effective. (androidauthority.com)

Recently discovered perovskite quantum dots with the common formula APbX 3 [A = Cs, MA (methylammonium), FA (formamidinium) and X = Cl, Br, I] have attracted a lot of interest. (sigmaaldrich.com)
Colors of various perovskite quantum dots under UV illumination. (sigmaaldrich.com)

It is demonstrated that the polarization angle and the polarization degree can be conveniently employed to associate emission lines in the recorded photoluminescence spectra to a specific dot. (aip.org)
Reversible In-Situ Photoluminescence Tuning of Mn2+ Doped ZnS Quantum Dots by Redox Chemistry. (azpdf.net)
These results were consistent with the model that charged quantum dots were also emissive, and that time-dependent charge migration gave rise to the observed photoluminescence dynamics. (princeton.edu)
QDs that are of a more intermediate size (~4 nm) emit green light-go photoluminescence (which is what we call this light emission process)! (medium.com)
Photoluminescence investigations of the InN quantum dots show that the emissions shift to higher energy with reduced quantum dot size, which we attribute to increased quantum confinement. (lu.se)

Silica-coated CdSe/ZnS Qdots were functionalized with blue-emitting oligofluorene to obtain white light emission. (azpdf.net)
This paper describes the use of electrostatically assembled CdSe quantum dot (QD) aggregates as artificial light harvesting-reaction center units for the photocatalytic reduction of H + to H 2 , where excitons are funneled through EnT from sensitizer QDs (sQDs) to catalyst QDs (cQDs). (osti.gov)

We use the finite difference time domain method (FDTD) to investigate polarisation control of single-photon emission from single quantum dots confined in elliptical micro-pillar microcavities. (bris.ac.uk)
Here, we propose a platform based on an optimized five-dipole-coupled-emitter system coupled to a cavity which enables perfect I at high T. Within our scheme the realization of perfect I single photon emission with dissipative QDs is possible using well established photonic platforms. (mdpi.com)

Tiny particles of matter called quantum dots, which emit light with exceptionally pure and bright colors, have found a prominent role as biological markers. (rdworldonline.com)
Quantum dots can emit light of different colors depending on their size, allowing for multicolor imaging in a single sample. (kget.com)
She uses quantum dots that are engineered to emit light at near-infrared (NIR) wavelengths, which are only mildly attenuated and scattered by tissue. (the-scientist.com)
QDs absorb light over a broad range of wavelengths and then emit light in a narrow emission band. (the-scientist.com)

Self-assembled, epitaxially grown InAs/GaAs quantum dots (QDs) are promising semiconductor quantum emitters that can be integrated on a chip for a variety of photonic quantum information science applications. (nature.com)
Single InAs/GaAs quantum dots (QDs) are one of the most promising solid-state quantum emitters for applications such as quantum light generation and single-photon level nonlinear optics 1 . (nature.com)
We investigate the spontaneous emission (SE) of self-assembled InAs quantum dots (QDs) embedded in GaAs ridge waveguides that lay on a low index substrate. (archives-ouvertes.fr)
Multi-state lasing in microdisk lasers with InAs/GaAs quantum dots // St. Petersburg Polytechnical University Journal: Physics and Mathematics . (hse.ru)

However, the in-plane location, polarization, and emission wavelength of such self-assembled QDs are not accurately controlled in a deterministic fashion, and thus techniques are required to determine these properties before device fabrication, in order to create optimally performing systems. (nature.com)
This wide-field technique is combined with confocal measurements within the same experimental set-up to determine emission wavelength and polarization. (nature.com)
Depending upon the size and composition of the halide, the emission wavelength of CsPbX3 QDS can be tuned to cover the entire visible spectral region (from 450 to 700 nm). (sigmaaldrich.com)
The CsPbCl 3 QDs emit blue light and the emission wavelength shifts to the green regime of visible spectrum as Cl is partially replaced by Br to yield the mixed halide perovskite CsPb(Cl/Br) 3 ( Figure 2 ). (sigmaaldrich.com)
Depending upon the size (this varies between 2.5-8nm), the emission wavelength of lead sulfide quantum dots can be tuned between 900 to 1600 nm, which falls in the infrared (IR) regime of the electromagnetic spectrum. (sigmaaldrich.com)
The small size of the quantum dots - much smaller than the wavelength of visible light - eliminates all light scattering and the associated optical losses. (sciencedaily.com)
The size of the dot, which ranges from 2 to 10 nanometres, influences the wavelength of light emission. (researchandmarkets.com)
To use light for connectivity we apply a broadcasting concept sensitizing the neural nodes to specific light signals and by sub-wavelength light manipulation of emission patterns using III-V nanowire-based components as well as molecular dyes. (lu.se)

K. Wada, R. Wang, T.Suzuki, R. S. Deacon, N. Fukata, and you will K. Ishibashi "Fabrication off Ge/Au moment ou core/layer nanowire quantum dots" 26th Global Microprocesses and Nanotechnology Appointment (MNC 2013), , Royton Sapporo Hakkaido, Japan 11. (healthfish.com)
We found that the InN quantum dots can be tuned to nucleate either preferentially at the edges between GaN nanowire side facets, or directly on the side facets by tuning the adatom migration by controlling the precursor supersaturation and growth temperature. (lu.se)

A novel opto-spintronic nanostructure made from layers of quantum dots can transfer information between electron spin and light at room temperature. (materialstoday.com)
In this work, to get an insight into ballistical electron transport through self-aligned Si-QDs, we extended our research work to the spatially-resolved characterization of electron emission from self-aligned Si-QDs formed on ultrathin SiO 2 /n-Si(100) by using a conductive cantilever. (confex.com)
In spatially-resolved characterization of electron emission from the align-dots through the Au top electrodes, current images were taken by using AFM in a non-contact mode keeping a distance of ~200nm from the sample surface by using a Au-coated Si cantilever with DC negative bias application to the Al back contact with respect to the grounded Au top electrode at room temperature in the atmosphere. (confex.com)
With DC bias application over -7V, non-uniform image contrast due to electron emission from localized area being almost the same size of Si-QDs, emerged and was enhanced exponentially with an increase in the applied bias. (confex.com)
Therefore, the observed electron emission is likely to be promoted by quasi-ballistic transport through aligned-dots structure. (confex.com)
The quantum dot deposition is followed by the deposition of an electron transporting layer (ETL) and electrodes. (sigmaaldrich.com)
Structural characterization by transmission electron microscopy and reciprocal space mapping show that the InN quantum dots are close to be fully relaxed (residual strain below 1%) and that the c-planes of the InN quantum dots are tilted with respect to the GaN core. (lu.se)
With the combination of the complementary information obtained with time-resolved X-ray absorption, X-ray emission and X-ray scattering we have successfully traced the electron transfer in complex molecules like the shown Ruthenium - Platinum or Ruthenium - Cobalt complexs with very high time-resolution. (lu.se)

Quantum dot LEDs offer highly saturated colors, allowing for improved image quality in displays and vibrant lighting solutions. (kget.com)
In optoelectronics, the superior performance of quantum dot LEDs and their integration into solar cells hold the promise of more energy-efficient technologies. (kget.com)
The narrow emission width (defined by narrow full width at half maximum (FWHM)) and the tunability of emission wavelengths with simple variations in the size and composition make the QDs attractive for LEDs. (sigmaaldrich.com)
We grow pyramids of InGaN, which are converted to platelets, with following growth of quantum wells on the top, to make micro LEDs. (lu.se)

Single photon sources (SPS) based on semiconductor quantum dot (QD) platforms are restricted to low temperature (T) operation due to the presence of strong dephasing processes. (mdpi.com)

The emission properties of single quantum dots in planar microcavities are studied experimentally and theoretically. (arxiv.org)
The optical linear polarization properties of exciton complexes in asymmetric Stranski-Krastanov grown GaN quantum dots have been investigated experimentally and theoretically. (aip.org)
We study experimentally and theoretically microwave photons interacting with electrons in semiconductor nanostructures in the so-called circuit quantum electrodynamics (cQED) setup. (lu.se)

Carbon quantum dots have been extensively investigated especially due to their strong and tunable fluorescence emission properties, which enable their applications in biomedicine, optronics, catalysis, and sensing. (wikipedia.org)
Some authors have provided evidence of size-dependent fluorescence properties, suggesting that the emission arises from electronic transitions with the core of the dots, influenced by quantum confinement effects, whereas other works have rather attributed the fluorescence to recombination of surface-trapped charges, or proposed a form of coupling between core and surface electronic states. (wikipedia.org)
The excitation-dependent fluorescence of CQDs, leading to their characteristic emission tunability, has been mostly linked to the inhomogeneous distribution of their emission characteristics, due to polydispersity, although some works have explained it as a violation of Kasha's rule arising from an unusually slow solvent relaxation. (wikipedia.org)

Reprinted from Conference on Lasers and Electro-Optics, 2006 and 2006 Quantum Electronics and Laser Science Conference (CLEO/QELS 2006). (bris.ac.uk)
Heterogeneously integrated III-V/SiN lasers operating with quantum-dot and quantum-well active regions are analyzed. (nature.com)
The quasi PT-symmetry design enables the creation of electrically pumped large-area edge-emitting lasers with high power single-mode emissions by selectively inducing loss on high-order modes. (nature.com)
This breakthrough opens a potential path to using quantum dots as a component in better photodetectors, chemical sensors and nanoscale lasers. (materialstoday.com)
Статья Zhukov A. , Moiseev E. , Nadtochiy A. , Fominykh N. , Ivanov K. , Makhov I. , Maximov M. , Zubov F. , Kryzhanovskaya N. Optical Loss in Microdisk Lasers with Dense Quantum Dot Arrays // IEEE Journal of Quantum Electronics . (hse.ru)

Foremost, we demonstrate the excitation by X-rays of quantum-dots (QD) emitting in the near-infrared (NIR), using a clinical X-ray system to map the distribution of QDs at depth in whole mouse. (herts.ac.uk)

Fivefold Enhanced spontaneous emission outside the microcavity is found for dots in resonance with the cavity mode, relative to detuned dots, while their radiative lifetime is only marginally decreased. (arxiv.org)

Additionally, quantum dots' catalytic properties open doors for greener and more sustainable chemical processes. (kget.com)
We are investigating novel iron-carbene complexes for solar light sensitization, light activated catalysts, novel polymer structures combining light sensitization and catalytic properties and novel nano dots for light sensitization and catalysis. (lu.se)

NY, NY, USA, November 21, 2023 / EINPresswire.com / -- Alfa Chemistry, a renowned chemical supplier, has made a significant stride in the field of scientific research and technological advancements with the launch of its extensive range of quantum dots . (kget.com)

Absorption and emission wavelengths of ~ 4 nm PbS quantum dots. (sigmaaldrich.com)
By configuring Quantum Dots as absorptive filters with specific bandpass ranges, it is possible to use them to detect specific wavelengths of light, turning the use case from a display to a light sensor. (androidauthority.com)
Quantum Dot filters can be finely tuned across a huge range of wavelengths, from deep violet to near-infrared wavelengths, which would be useful as a spectrometer. (androidauthority.com)
Smaller quantum dots (~2 nm) produce shorter wavelengths and higher frequencies (bluer), and bigger quantum dots (~6 nm) produce longer wavelengths and lower frequencies (redder). (medium.com)

Besides, the introduction of quantum dots in fingerprint display can optically mark fingerprint residues and improve the sensitivity of the display method," the spokesperson further added. (kget.com)
Just like atoms, quantum dots can similarly be optically excited! (medium.com)

Catalysis is yet another area where quantum dots have shown great promise. (kget.com)

Yang works with QD engineers to define the absorption and emission properties she needs, and then put on a polymer coating to preserve the optical properties of the NIR QDs. (the-scientist.com)
Finally, he is working on the implementation of efficient linear response equations to compute absorption and emission spectra, both at the UV-visible and X-ray energy ranges. (lu.se)

Quantum dots (QDs) are nanometer sized (~2-10 nm) semiconducting material. (sigmaaldrich.com)
The nanometer-size quantum dots are synthesized in a solvent containing soap-like molecules called surfactants as stabilizers. (sciencedaily.com)
The quantum dots in the dome absorb the invisible 400 nanometer light from the LED and reemit it in the visible region - a principle similar to that used in fluorescent lighting. (sciencedaily.com)

Owing to their small size, QDs exhibit quantum confinement effects and size-dependent electrical and optical properties. (sigmaaldrich.com)

Color Temperature Control of Quantum Dot White Light Emitting Diodes by Grafting Organic Fluorescent Molecules. (azpdf.net)
Using a laser as a spotlight, the team was able to follow the movement of individual DNA rectangles in the liquid, and also could detect changes in the fluorescent lifetime of the quantum dots when they were close to gold particles of different sizes. (materialstoday.com)
As a new class of fluorescent carbon nanomaterials, CQDs possess the attractive properties of high stability, good conductivity, low toxicity, environmental friendliness, simple synthetic routes as well as comparable optical properties to quantum dots. (wikipedia.org)
The results clearly demonstrated that the glycol chitosan derivative was remarkably effective at nucleating and stabilising semiconductor CdS quantum dots in aqueous suspensions under acidic, neutral, and alkaline media with an average size of approximately 2.5 nm and a fluorescent activity in the visible range of the spectra. (springer.com)

New research at Massachusetts Institute of Technology (MIT) could now make these quantum dots even more efficient at delivering precisely tuned colors of light. (rdworldonline.com)
Using this method, the researchers were able to show that a widely used material for quantum dots, cadmium selenide, does indeed produce very pure colors. (rdworldonline.com)
The small dot size also means that, typically, over 70 percent of the atoms are at surface sites so that chemical changes at these sites allow tuning of the light-emitting properties of the dots, permitting the emission of multiple colors from a single size dot. (sciencedaily.com)
Quantum dots are able to absorb light, so when you shine a light on them, they release this absorbed energy as distinctive and precise colors that depend on the quantum dot's size, shape, and material. (medium.com)
Specifically, quantum confinement is the culprit behind this optical correlation between the colors of QDs and their size + material. (medium.com)

The new method, developed in Bawendi's laboratory, is a radical departure from conventional means of observing light emissions from single emitters. (rdworldonline.com)
It was an open question whether the single-dot line widths were variable or not," Cui says. (rdworldonline.com)
Base excision repair-induced construction of a single quantum dot-based sensor for sensitive detection of DNA glycosylase activity. (azpdf.net)
In this study, novel carbohydrate-based nanoconjugates combining chemically modified chitosan with semiconductor quantum dots (QDs) were designed and synthesised via single-step aqueous route at room temperature. (springer.com)
Field studies were conducted in research and development laboratories, pilot plants, and manufacturing facilities handling carbon nanotube s (single-walled and multi-walled), carbon nanofibers, fullerenes, carbon nanopearls, metal oxides, electrospun nylon, and quantum dots. (cdc.gov)
Most of quantum chemistry has evolved to describe molecules where a single Slater determinant is a good starting point and can break down, sometimes spectacularly, for more complex systems. (lu.se)

Hida and you will K. Ishibashi (invited): "Carbon nanotube/molecule nanostructures to own quantum nanodevices", Worldwide Symposium with the Physics off Semiconductors and Software (ISPSA2013), July dos-5, Jeju, Korea 8. (healthfish.com)

The quantum dots strongly absorb light in the near UV range and re-emit visible light that has its color determined by both their size and surface chemistry. (sciencedaily.com)

For the electronic part of the system, we focus on using quantum dots that enable to build photodetectors and emitters in the microwave domain and strong coherent coupling between electric charge and microwave photons in the electrical circuits. (lu.se)

Researchers have synthesized 'giant' core-shell quantum dots with record-breaking emissive lifetimes. (materialstoday.com)

A quantum dot complex that emits white light to interact at the individual particle level with dopamine leading to changes in color and at the level of interacting with dopamine leading to changes in color and. (azpdf.net)
As for example, a white light emission was achieved by co-doping Mn and Cu in ZnSe Qdots. (azpdf.net)
In particular the difference between independent and entangled emitters, which is at the heart of quantum mechanics, can be made visible in the photon statistics of the emitted light. (uni-paderborn.de)
Similarly, nanotechnology researchers have been frustrated trying to control the light emitted from quantum dots, which brighten or dim with the proximity of other particles. (materialstoday.com)
QDs with a composition of CsPbBr 3 emit green light and the emission shifts towards the yellow regime for CsPb(Br/I) 3 and becomes red for CsPbI 3 . (sigmaaldrich.com)
In a different approach to creating white light several researchers at the Department of Energy's (DOE) Sandia National Laboratories have developed the first solid-state white light-emitting device using quantum dots. (sciencedaily.com)
In the future, the use of quantum dots as light-emitting phosphors may represent a major application of nanotechnology. (sciencedaily.com)
Understanding the physics of luminescence at the nanoscale and applying this knowledge to develop quantum dot-based light sources is the focus of this work," says Lauren Rohwer, principal investigator. (sciencedaily.com)
First, while the optical properties of conventional bulk phosphor powders are determined solely by the phosphor's chemical composition, in quantum dots the optical properties such as light absorbance are determined by the size of the dot. (sciencedaily.com)
Their shape, structure, and composition also affect their light emission capabilities. (researchandmarkets.com)
OLED technology or the Organic Light Emitting Diode may hinder the growth of QLED or the Quantum Dots Light Emitting Diode. (researchandmarkets.com)
Carbon nanodots could be used to produce Quantum Dots, but they emit less light. (researchandmarkets.com)
Properties, such as light emission, are directly linked to the size of the nanocrystal. (androidauthority.com)
This is useful to know when it comes to displays, cameras, and light detection technologies, as it allows for a quantum dot to be manufactured at a specific size in order to work with a very specific frequency of light. (androidauthority.com)
As a Quantum Dot produces one color from a light source of a higher power, it essentially acts a filter. (androidauthority.com)
Weighted component interconnectivity can be achieved by controlling light emission patterns and physical placement of individual neural nodes of the system. (lu.se)

After that, the resulting solution was centrifuged and the so-obtained pellet was redispersed in the same amount of solvent and further treated with 1.0 mM methanolic solution of ASA to form the complex on the dopant emission-quenched Qdots. (azpdf.net)
Separately, 20.0 L of 5.0 mM Cu2+ solution was added to the 2.0 mL dispersion of the ASA treated Qdots, then centrifuged and redispersed in the same amount of solvent to check the effect of Cu2+ on the emission of ASA treated Qdots. (azpdf.net)
Doing this we had to take care not to alter the surface chemistry of the quantum dots in transition from solvent to encapsulant," says Thoma, who worked on the encapsulation portion of the project. (sciencedaily.com)

840 nm emission quantum dots (4 nmoles, Ocean Nanotech) $229. (the-scientist.com)

The Quantum Dots market is expected to grow at a compound annual growth rate of 18.44% over the analyzed period to reach a market size of US$10.843 billion in 2026 from US$3.316 billion in 2019. (researchandmarkets.com)

The fusion-evaporation reaction 58Ni + 54Fe formed the compound nucleus 112Xe which then decayed by the emission of -particles, protons and neutrons. (lu.se)

When looking at its quantum properties, described by photon correlations, new information about the state of the matter generating the radiation can be revealed. (uni-paderborn.de)
Researchers have created a superlattice of semiconducting quantum dots that can display the electrical conducting properties of a metal. (materialstoday.com)
With their unique properties and versatile applications, quantum dots have garnered immense interest from researchers and industry professionals alike. (kget.com)
Although the integration of QD in optical cavities provides an enhancement of its emission properties, the technical requirements for maintaining high indistinguishability ( I ) at high T are still beyond the state of the art. (mdpi.com)
This provides two additional ways to tune the optical properties in addition to chemical composition of the quantum dot material itself," Wilcoxon says. (sciencedaily.com)
Approximately 3 decades ago, quantum dots (QDs) emerged as a notable class of nanomaterials because of their unique set of optical, electronic, magnetic, and chemical properties [ 1 - 3 ]. (springer.com)
The emission of a gluon cascade is, however, essential for the properties of the final state, although it does not change the total cross section. (lu.se)

Hida (Invited), "Optical emission and you can manage within the carbon dioxide nanotube quantum dots", The Sweden-The japanese Workshop towards the Quantum Nano-Physics and you will Electronic devices (QNANO2013), , Tokyo, Japan dos. (healthfish.com)

Статья Makhov I. , Ivanov K. , Moiseev E. , Dragunova A. , Fominykh N. , Shernyakov Y., Mikhail Maximov , Kryzhanovskaya N. , Zhukov A. Two-state lasing in microdisk laser diodes with quantum dot active region // Photonics . (hse.ru)

Our new line of quantum dots encompasses a diverse range of materials, including cadmium-based , indium-based, lead-based, and various other types, each offering specific characteristics and advantages for different applications," said a spokesperson from Alfa Chemistry. (kget.com)
Materials such as Silicon and Cadmium are employed in the production of QLED or Quantum Dots. (researchandmarkets.com)

Self-assembled, atomic diffusion controlled growth of InN quantum dots was realized on the side facets of dislocation-free and c-oriented GaN nanowires having a hexagonal cross-section. (lu.se)

Quantum dots can drive catalytic reactions with superior efficiency, enabling the development of more sustainable and environmentally friendly chemical processes. (kget.com)
The National Institute for Occupational Safety and Health (NIOSH) conducted field studies at 12 sites using the Nanoparticle Emission Assessment Technique (NEAT) to characterize emissions during processes where engineered nanomaterial s were produced or used. (cdc.gov)

Overall, our vast range of quantum dots provides researchers and industry professionals with an array of options to explore and innovate in their respective fields. (kget.com)

Because these small movements can be easily detected by tracking the changes in the quantum dot's brightness, they can be used to reveal, for example, the presence of a particular chemical that is selectively attached to the DNA rectangle. (materialstoday.com)

Quantum dots, often called artificial atoms , are tiny crystals that range in size from 2-10 nanometers. (medium.com)
To see this, let's first understand why quantum dots are nicknamed artificial atoms! (medium.com)

Microwave photons are one of the main interaction media in solid-state quantum devices such as superconducting and semiconducting qubits. (lu.se)

Quantum Dot based image sensors could be produced in smaller form factors and at much lower costs, enabling new products for consumer and industrial applications. (androidauthority.com)
A reasonable system may be able to get away with a dozen or so dots spread throughout the spectrum, to provide enough information and accuracy for most consumer applications. (androidauthority.com)

The experimental results are in agreement with configuration interaction computations, which predict similar polarization degrees for the exciton and the biexciton (within 10%) in typical GaN quantum dots. (aip.org)

In tunneling from bottom to top dots, electrons can gain their kinetic energies efficiently as a result of reduced inelastic scattering. (confex.com)

In the realm of optoelectronics, quantum dots have sparked a new era of technological possibilities. (kget.com)

Chemicals and Drugs12

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20231

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Light16

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20191

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