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Potential well
About: Potential well is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 30812 citations.
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TL;DR: In this article, the growth of PbTe quantum dots embedded in a novel fluorogermante glass matrix was investigated, and the size of the nanoparticles calculated from optical absorption spectra were found to be 3.2, 3.6, 6.1 and 7.3 nm.
14 citations
19 Dec 2013
TL;DR: In this paper, the quantum confinement effect and its influence on absorption and photoluminescence spectra of CdSe nanoparticles chemically synthesized in thermotropic ionic liquid crystal of cadmium octanoate are studied.
Abstract: Quantum confinement effect and its influence on absorption and photoluminescence spectra of CdSe nanoparticles chemically synthesized in thermotropic ionic liquid crystal of cadmium octanoate are studied. It was found out that the spectral resolution grows with decrease of temperature, so it becomes possible to distinguish the band-edge luminescence from the bands associated with the presence of surface defects. Obtained spectra were analyzed theoretically and the energy diagrams for samples with 1.8 nm and 2.6 nm nanoparticles were calculated.
14 citations
13 Jul 2021
TL;DR: In this article, a bubbling-assisted synthesis and spectroscopic study of S-dots formed from sulfur ions produced by the alkaline oxidation of bulk sulfur under the passivation of PEG was performed.
Abstract: Sulfur quantum dots (S-dots) emerge as promising luminescent materials owing to their remarkable optical properties. However, the mechanisms of their formation and photoluminescence remain concealed. We reveal these mechanisms by the bubbling-assisted synthesis and spectroscopic study of S-dots formed from sulfur ions produced by the alkaline oxidation of bulk sulfur under the passivation of PEG. The emission colour of the S-dots depends on the size, explained by the quantum confinement effect. The dots' luminescent quantum efficiency is strongly affected by the surface sulfur species, which is optimized by the proper surface oxidation. The simple synthesis, excellent luminescence properties, and metal-free nature attract S-dots to optoelectronic and electroluminescence applications.
14 citations
TL;DR: In this paper, the electronic states and optical transition properties of Si nanocrystals are studied by means of an sp 3 s * semi-empirical tight-binding approximation and supercell model, in which the silicon nanoparticles are columns of square cross-section with width from a to 7 a, where a is the lattice constant.
14 citations
TL;DR: Dy2O3 nanoparticles were synthesized at room temperature through soft chemical route using dysprosium acetate hexahydrate and hexamethylenetetramine as starting materials.
Abstract: Dy2O3 nanoparticles were synthesized at room temperature through soft chemical route using dysprosium acetate hexahydrate and hexamethylenetetramine as starting materials. As-synthesized Dy2O3 nanoparticles were calcined up to 600 °C and the samples were subjected to various characterizations. The decomposition course of as-prepared particles and the formation process of Dy2O3 were studied by TG/DTA. The cubic bixbyite phase formation of Dy2O3 nanoparticles was confirmed by XRD results. The particle size and morphology were investigated by TEM. The composition and surface passivation were confirmed by EDS and FTIR studies, respectively. The possible formation mechanism has been discussed based on the experimental results. Bandgap of the material was estimated from the UV–vis absorption spectra. A blue-shift was observed in the absorbance as a result of quantum confinement effect, which was supported by PL spectra.
14 citations