Results 191 to 200 of about 6,752 (248)

Magnetoexcitons in core/shell quantum dots

JETP Letters, 2014
The ground-state energies of the “bright” and “dark” excitons formed by an electron and a hole localized in a thin spherical shell subjected to a high magnetic field are calculated. This model corresponds to a core/shell quantum dot. The high-field condition implies that the magnetic length is much shorter than the radius of the sphere.
A. V. Kalameitsev, A. V. Chaplik
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Shell effects on the dielectric properties of core–shell quantum dots

The Journal of Chemical Physics, 2023
The dielectric properties in semiconductor quantum dots are crucial for exciton formation, migration, and recombination. Different from 3D bulk materials, the dielectric response is, however, ambiguous for the small-sized 0D dots in which the effect of outer atoms on the inner atoms is usually described qualitatively.
Yujuan Xie, Yingqi Cui, Li Zhang, Mingli Yang   +3 more
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Quantum Dot Bioconjugation during Core–Shell Synthesis

Angewandte Chemie International Edition, 2007
Quantum dots (QDs) have attracted tremendous interest in biological applications, such as bioimaging, biolabeling, and biosensing, because of their advantages over organic fluorophores at high quantum yield (QY), size-tunable narrow emission, photostability, etc. Many of the above applications entail water-soluble and biomolecule-conjugated QDs.
Qiangbin, Wang, Yan, Liu, Yonggang, Ke, Hao, Yan   +3 more
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Thick-Shell Core/Shell Quantum Dots

2020
Due to the Auger effect, traditional core/shell quantum dots exhibit emission intermittency, which affects the application of quantum dots on lasers. A thick shell could effectively inhibit the Auger nonradiation process, which makes the quantum dots have high optical gain.
Lei Zhang, Wenbin Xiang, Jiayu Zhang
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Intersubband absorption in core shell quantum dot

2013 International Conference on Microwave and Photonics (ICMAP), 2013
In this paper, the electron energy and intersubband absorption coefficient are calculated for a spherical core shell quantum dot structure. Considering the variation of dot size over a layer and scattering mechanisms, Gaussian distribution in density of state is used in the analysis.
Shampa Guin, N. R. Das
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Fluorescent DNA Probes Based on Quantum Dots and Core/Shell Quantum Dots

Applied Mechanics and Materials, 2013
Fluorescent DNA probes based on the fluorescence resonance energy transfer (FRET) were presented in this paper when AuNPs were as the energy acceptors and CdTe quantum dots and CdTe/SiO2 core/shell nanoparticles were as the energy acceptors, respectively.
Meng Meng Song, Wen Juan Guo, Zhao Dai, Kai Li Qiu, Jun Fu Wei   +4 more
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Quantum cascades of photons in colloidal core-shell quantum dots

Journal of Physics B: Atomic, Molecular and Optical Physics, 2009
Individual colloidal core-shell nanocrystals represent very promising single photon emitters. Recently, progress concerning the synthesis of their shell enabled strong reduction of their fluorescence intermittency, which was their main drawback. We show that the synthesis of thick shells also enables us to modify the Auger effect efficiency which is a ...
S Buil, P Spinicelli, I Mallek-Zouari, G Camps, X Quélin, B Mahler, B Dubertret, J-P Hermier   +7 more
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Core‐Shell Colloidal Quantum Dots for Energy Conversion

Advanced Energy Materials
AbstractColloidal quantum dots (QDs) are promising building blocks in optoelectronic devices, mainly due to their size/shape/composition‐tunable properties. Core–shell QDs, in particular, offer enhanced stability, mitigated photoluminescence blinking, and suppressed non‐radiative recombination compared to plain QDs, making them highly promising for ...
Lei Jin, Gurpreet Singh Selopal, Xiao Wei Sun, Federico Rosei   +3 more
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CdTe/CdS core shell quantum dots for photonic applications

Microelectronics Journal, 2005
Abstract In this work, we show a simple experimental procedure to obtain CdTe/CdS (diameter=3–7 nm) core shell nanocrystals in colloidal suspension. The nanocrystals were characterized by transmission electronic microscopy and powder X-ray diffraction analysis.
Frederico D. Menezes, A. G. Brasil, W. L. Moreira, L. C. Barbosa, C. L. Cesar, R. de C. Ferreira, P. M. A. de Farias, Beate S. Santos   +7 more
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“Flash” Synthesis of CdSe/CdS Core–Shell Quantum Dots

Chemistry of Materials, 2014
We report on the “flash” synthesis of CdSe/CdS core–shell quantum dots (QDs). This new method, based on a seeded growth approach and using an excess of a carboxylic acid, leads to an isotropic and epitaxial growth of a CdS shell on a wurtzite CdSe core.
Cirillo, Marco, Aubert, Tangi, Gomes, Raquel, Van Deun, Rik, Emplit, Philippe, Biermann, Amelie, Lange, Holger, Thomsen, Christian, Brainis, Edouard, Hens, Zeger   +9 more
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