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Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films
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In this article, the authors examined the spectra of stoichiometric and oxygen-deficient ZnO films grown on sapphire and found that the green and yellow emissions depend on the width of the free-carrier depletion region at the particle surface; the thinner the width, the larger the intensity.Abstract:
Photoluminescence and cathodoluminescence (CL) spectra of stoichiometric and oxygen-deficient ZnO films grown on sapphire were examined. It was found that the intensities of the green and yellow emissions depend on the width of the free-carrier depletion region at the particle surface; the thinner the width, the larger the intensity. Experimental results and spectral analyses suggest that the mechanism responsible for the green (yellow) emission is the recombination of a delocalized electron close to the conduction band with a deeply trapped hole in the single ionized oxygen vacancy Vo+ (the single negatively charged interstitial oxygen ion Oi−) center in the particle.read more
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Enhanced Ultraviolet Photodetector Based on Mg-Doped ZnO Nanorods Films
TL;DR: Magnesium-doped zinc oxide (ZnO: Mg) nanorods and nanotubes films were prepared by hydrothermal method deposited on glass substrates and X-ray diffraction analysis showed a decrease in the lattice parameters of Mg doped ZnO NRs as discussed by the authors.
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Fabrication and Photoluminescence Properties of ZnO Nanorods
TL;DR: In this article, the structural and optical properties of ZnO nanorods are investigated, and it is shown that the green emission depends strongly on the annealing temperature.
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High-density SiC nanocrystals with strong photoluminescence via a nitrogen-loss route
TL;DR: In this paper, a SiC/SiO2 luminescent composite was fabricated using a nitrogen loss technique and the density of SiC nanocrystals was as high as 5.2 × 1012 cm−2.
Journal ArticleDOI
Characteristics of ZnO Nanorod/ZnO/Si(100) Grown by Hydrothermal Method
TL;DR: In this article, the ZnO nanorod was grown on a polysilicon substrate for 5 hours by a hydrothermal method with concentrations of [ZNH] and [HMT] precursors ranging from 0.02M to 0.1M.
Journal ArticleDOI
pH dependent studies of chemical bath deposition grown ZnO-SiO 2 core-shell thin films
TL;DR: In this paper, ZnO-SiO2 core-shell thin films were synthesized using chemical-bath deposition at different pH levels and the transmittance was found not to depend on the bandgap values, but it was found possibly depend on fewer defect states created at a particular pH, as shown by Urbach energy and scanning electron microscopy (SEM) surface structure.
References
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Journal ArticleDOI
Electronic wave functions in semiconductor clusters: experiment and theory
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Correlation between photoluminescence and oxygen vacancies in ZnO phosphors
TL;DR: By combining electron paramagnetic resonance (EPR), optical absorption, and photoluminescence (PL) spectroscopy, a strong correlation is observed between the green 510 nm emission, the free-carrier concentration, and the density of singly ionized oxygen vacancies in commercial ZnO phosphor powders as mentioned in this paper.
Journal ArticleDOI
Point defects and luminescence centres in zinc oxide and zinc oxide doped with manganese
TL;DR: The green and yellow luminescence centres in ZnO and Mn-doped ZnOs are investigated in this article, and it seems that a VZn · V0 divacancy exists, and that luminecence is due to interstitial zinc and oxygen.
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Luminescent Transitions Associated With Divalent Copper Impurities and the Green Emission from Semiconducting Zinc Oxide
TL;DR: In this paper, the role of deep acceptor states in electronic processes in covalent solids was investigated and it was found that the transition is an optical charge transfer between a highly shielded localized level of the copper impurity and a level which is strongly perturbed by the valence-band states of the crystal.
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Identification of the transition responsible for the visible emission in ZnO using quantum size effects
TL;DR: In this article, the emission properties of suspensions of nanocrystalline ZnO particles with different particle sizes were studied and a linear relationship between the energetic maxima of the two emission bands was found.
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