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
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Strong room-temperature ultraviolet emission from nanocrystalline ZnO and ZnO:Ag films grown by ultrasonic spray pyrolysis
TL;DR: In this paper, Nanocrystalline ZnO and ZnAg films have been deposited on Si substrates by ultrasonic spray pyrolysis (USP) technique under ambient atmosphere, and the sample deposited at 500°C with spray rate of 0.15ml/min has the strongest near-band edge ultraviolet emission (378nm) observed in the room-temperature photoluminescence (RT PL) measurement.
Journal ArticleDOI
Bovine serum albumin assisted synthesis of Ag/Ag2O/ZnO photocatalyst with enhanced photocatalytic activity under visible light
Ding Wenqiang,Lidan Zhao,Hongguang Yan,Xin Wang,Liu Xiaoping,Xiangyu Zhang,Xiaobo Huang,Ruiqiang Hang,Yueyue Wang,Xiaohong Yao,Bin Tang +10 more
TL;DR: In this paper, a 3D-flower-like architecture was used to fabricate ternary silver/silver oxide/zinc oxide (Ag/Ag2O/ZnO) photocatalyst with assistance of bovine serum albumin (BSA).
Journal ArticleDOI
Ferromagnetism from non-magnetic ions: Ag-doped ZnO
Nasir Ali,Vijaya A. R.,Zaheer Ahmed Khan,Kartick Tarafder,Anuvesh Kumar,Manoj K. Wadhwa,Budhi Singh,Subhasis Ghosh +7 more
TL;DR: It has been established that the overlapping of bound magnetic polarons is responsible for RTFM in low doping concentration, however, anti-ferromagnetic coupling sets in at higher doping concentrations and hence weakens the FMO to a large extent.
Journal ArticleDOI
Optical and Structural Study of ZnO Thin Films Deposited by RF Magnetron Sputtering at Different Thicknesses: a Comparison with Single Crystal
A.K. Jazmati,B. Abdallah +1 more
TL;DR: In this paper, a correlation between band gap values and crystalline quality, which is improved with thickness, has been discussed, where the calculated refractive indices of the thicker deposited films have increased as the thickness increases.
Journal ArticleDOI
Preparation and characterizations of highly transparent UV-curable ZnO-acrylic nanocomposites
H. W. Huang,Tsung-Eong Hsieh +1 more
TL;DR: In this article, a sol-gel chemical route was adopted to prepare the zinc oxide (ZnO) nanoparticles as small as 4 nm, and the resulting ZnO-acrylic nanocomposites were then prepared by employing 3-(trimethoxysilyl)propyl methacrylate (TPMA) as the surface modification agent.
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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