Journal ArticleDOI
Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films
TLDR
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
Citations
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Journal ArticleDOI
Synthesis and Room Temperature Ferromagnetism of Flower-shaped Mn Doped ZnO Nanostructures
TL;DR: In this paper, a large-scale flower-shaped Mn doped ZnO nanostructures have been grown on silicon substrates by simple thermal evaporation at atmospheric pressure.
Journal ArticleDOI
Thermo- and Photo-annealing of ZnO Nanocrystals
TL;DR: In this article, a ZnO nanocrystals grown by chemical solution deposition have been annealed in ambient air using heat and cw He-Cd laser treatments.
Journal ArticleDOI
Giant enhanced infrared and orange emissions of ZnO nanoparticles induced by rich oxygen atmosphere
TL;DR: In this article, the mesoporous precursors of ZnO nanoparticles were calcined by a sol-gel method using Octadcylamine (ODA) and Pluronic F-127 (F-127) as template reagents.
Journal ArticleDOI
Structure, electric and thermoelectric properties of binary ZnO-based ceramics doped with Fe and Co
A.V. Pashkevich,Aleksander K. Fedotov,E. N. Poddenezhny,L. A. Bliznyuk,Julia Fedotova,N.A. Basov,A. A. Kharchanka,Pawel Zukowski,Tomasz N. Koltunowicz,Olga V. Korolik,V. V. Fedotova +10 more
TL;DR: In this article, the interconnection between structure (grain sizes, chemical and phase composition, porosity) and some electric properties (resistivity, Hall and Seebeck coefficients, as well as power factor, concentration and mobilities of carriers) in composite ceramics was studied.
Journal ArticleDOI
Radio-frequency magnetron sputtering and wet thermal oxidation of ZnO thin film
TL;DR: In this paper, the authors studied the growth and wet thermal oxidation of ZnO thin films using a radio-frequency magnetron sputtering technique, and they found that the growth was more significantly improved by annealing in air, N2 and O2 ambient.
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.
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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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