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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Enhanced photocatalytic activity of ZnO microflower arrays synthesized by one-step etching approach
TL;DR: In this article, a new type of ZnO microflower arrays was successfully synthesized via a one-step etching route based on chemical bath disposition (CBD) method without any assistant reagents.
Journal ArticleDOI
Photoluminescence based H2 and O2 gas sensing by ZnO nanowires
TL;DR: In this paper, the photoluminescence (PL) spectra of ZnO nanowires were analyzed and two different PL peaks positioned at 380 and 520 nm were identified.
Journal ArticleDOI
ZnO-porous silicon nanocomposite for possible memristive device fabrication
TL;DR: The proposed device exhibits a zero-crossing pinched hysteresis current-voltage (I-V) curve characteristic of memristive systems.
Journal ArticleDOI
ZnO nanoflowers-based photoanodes: aqueous chemical synthesis, microstructure and optical properties
Ruri Agung Wahyuono,Ruri Agung Wahyuono,Christa Schmidt,Andrea Dellith,Jan Dellith,Martin Schulz,Martin Schulz,Martin Seyring,Markus Rettenmayr,Jonathan Plentz,Benjamin Dietzek,Benjamin Dietzek +11 more
TL;DR: In this article, a low temperature, synthetic route for ZnO nanoflowers (NFs) as photoanode material was developed, which yields small flowerlike nanostructures, built from densely self-assembled tip-ended rod structures.
Journal ArticleDOI
A Systematic Study on the Structural and Optical Properties of Vertically Aligned Zinc Oxide Nanorods Grown by High Pressure Assisted Pulsed Laser Deposition Technique
TL;DR: This study signifies that high pressure PLD technique can be used more efficiently for controlled and efficient growth of VAZO nanorods on different substrates.
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.
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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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