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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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Size-induced elastic stiffening of ZnO nanostructures: Skin-depth energy pinning
TL;DR: In this paper, an extension of the atomic "coordinationradius" correlation premise of Pauling and Goldschmidt to energy domain has enabled them to clarify that the elastic modulus is intrinsically proportional to the sum of bond energy per unit volume.
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The effects of oxygen partial pressure on the microstructures and photocatalytic property of ZnO nanoparticles
Huihu Wang,Changsheng Xie +1 more
TL;DR: In this paper, the effects of oxygen partial pressure on the microstructures and photocatalytic activity of ZnO nanoparticles prepared by evaporation-condensation method in a flow of Ar and O 2 have been studied by field-emission scanning electron microscopy (FESEM), XRD, XSM800 photoelectron spectrometer (XPS) and UV-Vis spectrometers.
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Motivating high-valence Nb doping by fast molten salt method for NiFe hydroxides toward efficient oxygen evolution reaction
Bin Dong,Ya-Nan Zhou,Fulan Wei,Fu-Li Wang,Shu-Yue Dou,Zhuo-Ning Shi,Bin Dong,Wen-Li Yu,Hui-Ying Zhao,Feng-Ge Wang,Jianfeng Yu,Yong-Ming Chai +11 more
TL;DR: In this article, an elaborate molten salt method is applied to rapidly incorporate Nb into NiFe-layered double hydroxides (Nb-NiFe-LDH), which ensures maximum exposure of active sites.
Journal ArticleDOI
Fabrication of porous cubic architecture of ZnO using Zn-terephthalate MOFs with characteristic microstructures.
TL;DR: A method for synthesizing porous cubic-shaped ZnO particles a few tens of micrometers in size is described on the basis of a pyrolytic conversion of Zn-terephthalate metal-organic frameworks (MOFs).
Journal ArticleDOI
Self-powered visible-blind UV photodetectors based on p-NiO nanoflakes/n-ZnO nanorod arrays with an MgO interfacial layer
Chengtai Wei,Jianping Xu,Shaobo Shi,Rui Cao,Jing Chen,Hong Dong,Xiaosong Zhang,Shougen Yin,Lan Li +8 more
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References
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Journal ArticleDOI
Electronic wave functions in semiconductor clusters: experiment and theory
Journal ArticleDOI
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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