Sentences with word «photoluminescence»

They could obtain uniform perovskite nanocrystals in sizes ranging from 2.5 to 100 nanometers, with high photoluminescence quantum yield, a measure of fluorescence that is critical to the performance of perovskites in a variety of applications.

With their low light loss and high photoluminescence quantum yield, these novel one - dimensional microstructures could serve as an effective platform for the development of new systems of color tunable optical waveguides with polarized emissions.

Next, the researchers shined a laser on the crystals to measure a property called photoluminescence — the material's ability to emit light when excited by a laser — in different areas of the crystals.

«We've demonstrated, for the first time, efficient charge transfer in MX2 heterostructures through combined photoluminescence mapping and transient absorption measurements,» says Feng Wang, a condensed matter physicist with Berkeley Lab's Materials Sciences Division and the University of California (UC) Berkeley's Physics Department.

Engineered electron spin and charge polarization, as well as transport across or along the interface, might be possible as evidenced by the enhanced photoluminescence signals at these positions.

«Thermally activated delayed photoluminescence from semiconductor nanocrystals.»

Super-strong graphene oxide (GO) sheets are useful for ultrathin, flexible nano - electronic devices, and display unique properties including photoluminescence and room temperature ferromagnetism.

It was predicted to be stable and exhibit excellent photoluminescence properties.

A preliminary photoluminescence study indicates a band - edge emission at 453 nanometers, which is red - shifted slightly as compared to bulk crystals.

They also exhibited efficient photoluminescence, color - tunability, and a unique structural relaxation not found in covalent semiconductor sheets.

«This interferes with the electron densities in the bilayer system, which gives you a different photoluminescence.»

Dr Marek Potemski and co-workers working at CNRS (France) in collaboration with researchers at the University of Warsaw (Poland) discovered stable quantum emitters at the edges of WSe2 monolayers, displaying highly localised photoluminescence with single - photon emission characteristics.

Researchers at the U.S. Department of Energy's Ames Laboratory have developed germanium nanoparticles with improved photoluminescence, making them potentially better materials for solar cells and imaging probes.

The research results, «Germanium - Tin / Cadmium Sulfide Core / Shell Nanocrystals with Enhanced Near - Infrared Photoluminescence,» were published in the American Chemical Society's journal Chemistry of Materials.

Akin to the conventional metal - ligand system, the molecules synthesized by Filonenko consist of a ligand and a copper ion which interact to produce photoluminescence.

This heavy negative doping — electrons have negative charge — limits both the intensity and carrier lifetime for photoluminescence, two important properties for all optoelectronic applications, such as photovoltaics and photosensors.»

Researchers, led by Prof. Julia Khusnutdinova, designed compounds whose photoluminescence depended on weak interactions between atoms within the single compound molecule itself.

The team focused on TMD monolayers such as WS2 and WSe2, which have high optical responsivity, and found that samples exhibiting low photoluminescence (PL) intensity exhibited a high degree of valley polarization.

Surface states are certainly important in preventing photoluminescence, but it is not clear how such states could promote the emission of visible light.

In each test, the researchers used a blue laser light with a wavelength of 458 nanometres to create photoluminescence.

In their most recent work, the NRL researchers showed that an electric field typical of those found in neuronal membranes results in suppression of the QD photoluminescence (PL) and, for the first time, that QD PL is able to track the action potential profile of a firing neuron with millisecond time resolution.

Synthesis of Zn - Cu - In - S / ZnS Core / Shell Quantum Dots with Inhibited Blue - Shift Photoluminescence and Applications for Tumor Targeted Bioimaging Weisheng Guo, Na chen, Yu Tu, Chunhong Dong, Bingbo Zhang, Chunhong Hu, Jin Chang Theranostics 2013; 3 (2): 99 - 108.

Taking into account the TPCO and FPCO photoluminescence data, we discuss luminescent and photothermal techniques for study small amounts of dopants.

Transition - metal dichalcogenide monolayers have naturally terminated surfaces and can exhibit a near - unity photoluminescence quantum yield in the presence of suitable defect passivation.

Acronyms: XRF = x-ray fluoresencence; RBS = Rutherford Backscattering; XRD = x-ray diffraction; SEM = scanning electron microscopy; AFM = atomic force microcopy; PES = photoelectron spectroscopy, with x-rays (XPS) and ultraviolet (UPS); KP = Kelvin probe measurements, SECM = scanning electrochemical microscopy, PL = photoluminescence; FTIR = Fourier transform infrared spectroscopy

At intermediate levels of BPEI, numerous sp2 domains grow with nitrogen in a predominantly graphitic configuration, yielding a high photoluminescence yield.

Sometimes this energy is re-emitted as light, a process called photoluminescence.

Pyrenecarboxylic acid - functionalized CdSe quantum dots undergo thermally activated delayed photoluminescence.

For example, it was predicted to absorb light in the near - UV and blue region and have high photoluminescence, which is the material's ability to emit light when excited by a higher energy light source.

A good solar cell material emits light very well, so the higher the photoluminescence, the more efficient the solar cell should be.

The areas with higher bromine concentrations had up to 180 percent higher photoluminescence than areas depleted of bromine ions.

The photoluminescence material they created absorbs the radiation from the sun, and converts the heat and light from the sun into an «ideal» radiation, which illuminates the photovoltaic cell and enables higher conversion efficiency.

An overlay of the microscope image of a quantum LED device and the photoluminescence image from the active area of WSe2.

However, when the dye is added to the graphene or N - doped graphene substrate, the photoluminescence — fluorescence — is quenched.

Using transmission electron microscopy imaging and powder X-ray diffraction to study the structural characteristics of the nanoparticles and Raman and photoluminescence spectroscopies to quantify lattice strain and photoluminescence behavior, the group found a correlation between the amount of tin in the core and how well the core's lattice matched that of the cadmium - sulfide outer shell.

«Addition of tin boosts nanoparticle's photoluminescence.»

Photoluminescence mapping of a MoS2 / WS2 heterostructure with the color scale representing photoluminescence intensity shows strong quenching of the MoS2 photoluminescence.

Millstone says that taken together these observations provide a new platform to investigate the structural origins of small metal nanoparticles» photoluminescence and of alloy formation in general.

This enhanced the photoluminescence intensity and the carrier lifetime by 100 times.

Because the photoluminescence in the conducting polymer is quenched by interaction with C60, the data imply that charge transfer from the excited state occurs on a picosecond time scale.

Lower Panel: Photoluminescence (PL) intensity map of a triangular monolayer island of WS2 and the associated valley polarization map demonstrate the clear inverse relationship.

They excel in a property called the photoluminescence quantum efficiency, which is key to maximizing the efficiency of solar cells.

Inset is a photoluminescence intensity map showing that the linear junction region along the triangular interface produces enhanced light emission (red region).

The researchers also discovered that electric stimuli can switch the photoluminescence color of [10] CPP - I from a green - blue color to a white color.

His photoluminescence spectra, recorded at low temperatures, clearly indicated that phonons were involved.

Once the researchers were confident that they had made their desired material, they enlisted the help of Bruce Hamilton of UMIST's physics department to carry out the photoluminescence tests.

A team led by chemist David Leigh of the University of Manchester Institute of Science and Technology have been working with physicist colleagues to design stable and cheap materials with a property known as «photoluminescence».