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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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Synthesis and photoluminescence of Cl-doped ZnO nanospheres
Zhenwei Tao,Xibin Yu,Xiaoyan Fei,Jie Liu,Guangqian Yang,Yongheng Zhao,Shiping Yang,Liangzhun Yang +7 more
TL;DR: In this paper, the defect energy level between the luminescent center and the conduction band was investigated in ZnO nanospheres with the average diameter about 60 nm.
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Facile photochemical synthesis of ZnO nanoparticles in aqueous solution without capping agents
TL;DR: In this paper, the synthesis of ZnO nanoparticles by photochemical route in an aqueous solvent mixture without capping agents is reported, and size and shape of nanoparticles are confirmed using dynamic light scattering, scanning and transmission electron microscopy.
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Effect of Mg doping on photoluminescence of ZnO/MCM-41 nanocomposite
TL;DR: In this paper, the photoluminescence (PL) behavior of Mg x Zn 1− x O/MCM-41 nanocomposite (where x ǫ= 0.05, 0.15, 0ǫ.25 and 0.30) is reported.
Journal ArticleDOI
Surface luminescence in ZnO nanoparticles
TL;DR: In this paper, the authors performed spectral and time-resolved photoluminescence (TRPL) measurements on ZnO nanoparticles of different sizes (17-300nm).
Journal ArticleDOI
Zirconium Doped Copper Ferrite (CuFe2O4) Nanoparticles for the Enhancement of Visible Light-Responsive Photocatalytic Degradation of Rose Bengal and Indigo Carmine Dyes
P. Nancy Dayana,M. John Abel,P. Fermi Hilbert Inbaraj,S. Sivaranjani,R. Thiruneelakandan,J. Joseph Prince +5 more
TL;DR: In this paper, the Zr doped CuFe2O4 nanoparticles were prepared with different concentrations of zirconium ions through the chemical precipitation method and the crystal structure and phase were identified by XRD characterization.
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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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