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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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Photoluminescence and SERS investigation of plasma treated ZnO nanorods
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Improved Luminescence Properties of Polycrystalline ZnO Annealed in Reduction Atmosphere
TL;DR: In this paper, the luminescence properties of polycrystalline ZnO annealed in reducing ambience (H₂/N₁) have been studied.
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Crystal symmetry breaking of wurtzite to orthorhombic in nonpolar a-ZnO epifilms
TL;DR: In this article, the symmetry breaking of wurtzite C6V to orthorhombic C2V due to in-plane anisotropic strain was investigated for nonpolar (112¯0) ZnO epifilms grown on the R-sapphire.
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Effects of stoichiometry on defect formation in ZnO epilayers grown by molecular-beam epitaxy : An optically detected magnetic resonance study
TL;DR: In this article, the effects of nonstoichiometry during the growth of MBE epilayers were investigated and several defects were revealed via monitoring the yellow PL emission (∼2.17eV) and their magnetic resonance signatures.
Journal ArticleDOI
Optical characterization of ZnO nanobelts
TL;DR: In this paper, the decay curves of time resolved laser induced photoluminescence, various optical parameters such as Einstein's spontaneous and stimulated coefficients, oscillator strength, integrated cross-section and dipole-moment of ZnO nanobelts have been calculated and reported.
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.
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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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