Sentences with phrase «fpco photoluminescence»

Quasi-continuum photoluminescence: Unusual broad spectral and temporal characteristics found in defective surfaces of silica and other materials

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

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.

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.

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

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.

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

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.

«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.

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.»

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.

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.

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.»

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

«Thermally activated delayed photoluminescence from semiconductor nanocrystals.»

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.

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

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.

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.

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

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.

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

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

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».

Dramatic though this photoluminescence is, it is not what the optoelectronics industry needs.

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.

Tip - enhanced optical spectroscopies (TEOS) such as TERS (tip - enhanced Raman spectroscopy) and TEPL (tip - enhanced photoluminescence) provide a unique capability for the characterization of diverse 0, 1 and 2D materials.

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

From the absolute photoluminescence intensity, we measure internal and external quantum efficiencies of 99.7 % and 72 %, respectively.