Quantum Dots

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PLQY in NIR with Fluorolog-QM and K-Sphere
K-Sphere
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%.
Photoluminescence Upconversion with the Fluorolog-QM
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.
How Inner-Filter Effects (IFE) can affect your fluorescence measurements: A case study - Colloidal InP Quantum Dots
During the last two decades, a great deal of attention has been focused on the optoelectronic properties of nanostructured semiconductors or Quantum Dots (QDs).
Quantum Dot Absorbance, Photoluminescence Spectra and Lifetimes
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.
Photoluminescence of InGaAs/GaAs Quantum Dots
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.
Recording Fluorescence Quantum Yields
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
Photoluminescence Spectroscopy of Quantum Dots
Quantum dots (QDs) have potential applications in optoelectronics, biosensing, biolabeling, memory devices, and sources of laser light.
Near-IR Photoluminescence of Quantum Dots
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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