Semiconductors

Quantum Dots

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Quantum Dots (QDs) are nanoscale particles made of semiconductor materials. These particles exhibit quantum effects, which give them unique optical and electronic properties. The luminescence of quantum dots is a phenomenon caused by these quantum effects at the nanoscale. This luminescence allows quantum dots to emit light with a specific wavelength depending on their size. As a result, quantum dots are expected to find applications in various advanced technological fields.

Film Thickness and Quality | Luminescence Analysis

Film Thickness and Quality

In the advancement of thin film technology through miniaturization, we propose solutions for achieving high film deposition control, such as in-situ evaluation during the film deposition process and evaluation of thin films at the Ångström order level.

Thin film analysis in liquid: Analysis using a spectroscopic ellipsometer liquid measurement cell
In situ thin film evaluation: In-chamber wafer analysis by incorporating analytical parts into the chamber

Membrane information obtained using a spectroscopic ellipsometer

UVISEL ellipsometers have been used for the characterization of several systems of nanoparticles. This ellipsometric characterization involves the development of specific modeling tools available within DeltaPsi2 software.

Silicon nanoparticles (Si-nps) show different optical properties than bulk silicon. A strong correlation has been established between the particle size and the band-gap for example. These particular properties offer potentialities of application in optoelectronics, silicon based memories and third generation solar cells.

Luminescence Analysis

Quantum Dots (QDs) are nanoscale particles made of semiconductor materials. These particles exhibit so-called quantum effects, which give them unique optical and electronic properties. The luminescence of quantum dots is a unique phenomenon that is caused by quantum effects at the nanoscale. This makes it possible to emit light with a specific wavelength depending on quantum dots size, and is expected to find applications in a variety of advanced technological fields.

The Fluorolog-QM fluorescence spectrometer with an integrating sphere option is an excellent choice for PLQY measurements in NIR. The K-Sphere is very convenient and easy to use, as it couples directly to the sample compartment optics and allows a use of external light sources, such as DPSS lasers, which can be attached to the front of the sample compartment. The sphere has holders for cuvettes, slides and powders that can be easily interchanged. The results demonstrate very good reproducibility and precision for NIR PLQY measurements spanning almost two orders of magnitude. Based on multiple measurements, the demonstrated PLQY standard deviations range from 1.3% for high QY value (77%) to 6.4% for the QY below 1%.

DPSS laser mounted to the front of the Fluorolog-QM sample compartment

The new Fluorolog-QM spectrofluorometers, due to their modularity and advanced software and a universal interface, are an ideal choice for studying multiple aspects of upconversion. This technical note illustrates the use of Fluorolog-QM-75-21 for spectral and time-resolved characterization of these materials.

InGaAs/GaAs and InAs/GaAs quantum dots (QDs) have been identified as suitable candidates for various applications in the terahertz range by using their intraband carrier transitions.

New NIR DSS detectors in final QC at the HORIBA NJ Optical Spectroscopy Center in Piscataway, NJ.

This technical note serves as a guideline to selecting the best solid state detector with the Fluorolog-QM modular research spectrofluorometer for a given series of photoluminescence experiments.

During the last two decades, a great deal of attention has been focused on the optoelectronic properties of nanostructured semiconductors or Quantum Dots (QDs).

A-TEEM™ for Qtracker® 655 quantum dots

Quantum dots (QDs) are semiconducting spheres in the size typically in the range of 1 to 10nm. The size of these small spheres give quantum dots the semiconducting properties and resulting photoluminescence that would not necessarily occur for the same material on larger scales.

When a fluorophore absorbs a photon of light, an energetically excited state is formed. The fate of this species is varied, depending upon the exact nature of the fluorophore and its surroundings, but the end result is deactivation (loss of energy) and return to the ground state.

Photoluminescence Spectroscopy of Quantum Dots

Quantum dots (QDs) have potential applications in optoelectronics, biosensing, biolabeling, memory devices, and sources of laser light.

HORIBA Jobin Yvon’s NanoLog® spectrofluorometer, specially optimized for recording near-IR fluorescence from nanoparticles, includes a double-grating excitation monochromator, imaging emission spectrograph with a selectable-grating turret, and a variety of detectors.

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UVISEL Plus

Spectroscopic Ellipsometer from FUV to NIR: 190 to 2100 nm

Fluorolog-QM

Modular Research Fluorometer for Lifetime and Steady State Measurements

iHR Series

Mid-Focal Length Imaging Spectrometers

Duetta

Fluorescence and Absorbance Spectrometer

FluoroMax Plus

Steady State and Lifetime Benchtop Spectrofluorometer

Nanolog

Steady State and Lifetime Nanotechnology EEM Spectrofluorometer

Nanosizer

For Single‐Walled Carbon Nanotube Excitation‐Emission Map Simulation and Analysis