Temperature-dependent shifts of three emission bands for ZnO nanoneedle arrays

Cao, Bingqiang; Cai, Weiping; Zeng, Haibo

doi:10.1063/1.2195694

Cited by 312 publications

(187 citation statements)

References 25 publications

Supporting

Mentioning

162

Contrasting

Unclassified

Order By: Relevance

“…As a result, at 50 K, the maximum of the green luminescence band is located at 2.1 eV, with its halfwidth being 400 meV. The authors of [27] consider their experimental results to be consistent with the ODMR data from [17].…”

Section: Green Luminescencesupporting

confidence: 75%

“…The study of the temperature dependence of the maximum position of the green luminescence of ZnO nanoneedles showed that the following two processes contribute to the luminescence emission: (i) high-temperature recombination of electrons of the conduction band with holes at the VO-level and/or (ii) low-temperature recombination of electrons of Zni-centers with holes at the VO-level [27] (Fig. 5).…”

Section: Green Luminescencementioning

confidence: 99%

See 1 more Smart Citation

Optical and luminescence properties of zinc oxide (Review)

Родный¹,

Khodyuk²

2011

Opt. Spectrosc.

373

190

View full text Add to dashboard Cite

Abstract-We generalize and systematize basic experimental data on optical and luminescence properties of ZnO single crystals, thin films, powders, ceramics, and nanocrystals. We consider and study mechanisms by which two main emission bands occur, a short-wavelength band near the fundamental absorption edge and a broad long-wavelength band, the maximum of which usually lies in the green spectral range. We determine a relationship between the two luminescence bands and study in detail the possibility of controlling the characteristics of ZnO by varying the maximum position of the short-wavelength band. We show that the optical and luminescence characteristics of ZnO largely depend on the choice of the corresponding impurity and the parameters of the synthesis and subsequent treatment of the sample. Prospects for using zinc oxide as a scintillator material are discussed. Additionally, we consider experimental results that are of principal interest for practice.

show abstract

Section: Green Luminescencesupporting

confidence: 75%

Section: Green Luminescencementioning

confidence: 99%

Optical and luminescence properties of zinc oxide (Review)

Родный¹,

Khodyuk²

2011

Opt. Spectrosc.

373

190

View full text Add to dashboard Cite

show abstract

“…27,35 Moreover, the PL of the ZnO-T-ZnAl2O4 samples was shown to be strongly dependent on the excitation spot (plots (3) and (4) from Figure 2a) revealing that the optically active defects are inhomogeneously distributed.…”

Section: Znxme1-xoy 3-d Hybrid Networkmentioning

confidence: 99%

Hybridization of Zinc Oxide Tetrapods for Selective Gas Sensing Applications

Lupan

Postica

Gröttrup

et al. 2017

ACS Appl. Mater. Interfaces

141

113

View full text Add to dashboard Cite

In this work, the exceptionally improved sensing capability of highly porous 3-D hybrid ceramic networks with respect to reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on metal oxides Me= Fe, Cu, Al) doped and alloyed zinc oxide tetrapods (ZnO-T) forming numerous heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO tetrapods grown by flame transport synthesis (FTS) approach with different weight ratios (ZnO:Me, e.g., 20:1) and followed by subsequent thermal annealing them in air. The gas sensing studies reveal the possibility to control and change/tune the selectivity of the materials, depending on the elemental content ratio and the type of the added metal oxide in 3-D ZnO-T hybrid networks.While pristine ZnO-T networks showed a good response to H2 gas, a change/tune in selectivity to ethanol vapour with a decrease in optimal operating temperature was observed in the networks hybridized with Fe-oxide and Cu-oxide. In case of hybridization with ZnAl2O4 an improvement of H2 gas response (to ≈ 7.5) was reached at lower doping concentrations (20:1), whereas the increasing in concentration of ZnAl2O4 (10:1), the selectivity changes to methane CH4 gas (response ≈ 28). Selectivity tuning to different gases is attributed to the catalytic properties of the metal oxides after hybridization, while the sensitivity improvement is mainly associated with additional modulation of resistance by the built-in potential barriers between n-n and n-p heterojunctions, during adsorption and desorption of gaseous species. Density functional theory based calculations provided the mechanistic insights into the interactions between different hybrid networks and gas molecules supporting the experimentally observed results. The studied materials and sensor structures would provide particular advantages in the field of fundamental research, industrial and ecological applications.

show abstract

“…High fluence irradiation causes an increase of the relative weights these peaks compared to the UV peak. PL peaks ~ 2.9 eV and ~ 3.15 eV are generally attributed to Zn I related defects [14,15]. Also, it has been predicted that energy state of photo-excited O V s in ZnO may lie close to the conduction band minimum [16].…”

Section: Resultsmentioning

confidence: 99%