Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films

Wu, Xiaohong; Siu, G. G.; Fu, C. L.; Ong, H. C.

doi:10.1063/1.1361288

Cited by 1,008 publications

(541 citation statements)

References 10 publications

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“…1a). There is no 'green' or 'yellow' luminescence usually observed in undoped ZnO samples and attributed to native defects; an ionized oxygen vacancy and an oxygen interstitial, respectively [8]. The decay of the X-ray excited luminescence is fast (0.8 ns), monoexponential in time over four decades which indicates that the luminescence arises from a homogeneous excited state.…”

Section: Resultsmentioning

confidence: 84%

Development of ZnO:Ga as an ultra-fast scintillator

Bourret-Courchesne¹,

Derenzo²,

Weber³

2009

Nuclear Instruments and Methods in Physics Research Section A:

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Abstract-We report on several methods for synthesizing the ultra-fast scintillator ZnO(Ga), and measurements of the resulting products. This material has characteristics that make it an excellent alpha detector for tagging the time and direction of individual neutrons produced by t-d and d-d neutron generators (associated particle imaging). The intensity and decay time are strongly dependent on the method used for dopant incorporation. We compare samples made by diffusion of Ga metal to samples made by solid state reaction between ZnO and Ga 2 O 3 followed by reduction in hydrogen. The latter is much more successful and has a pure, strong near-band-edge fluorescence and an ultra-fast decay time of the x-ray-excited luminescence. The luminescence increases dramatically as the temperature is reduced to 10K. We also present results of an alternate low-temperature synthesis that produces luminescent particles with a more uniform size distribution. We examine possible mechanisms for the bright near-band-edge scintillation and favor the explanation that it is due to the recombination of Ga 3+ donor electrons with ionization holes trapped on H + ion acceptors.

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Section: Resultsmentioning

confidence: 84%

Development of ZnO:Ga as an ultra-fast scintillator

Bourret-Courchesne¹,

Derenzo²,

Weber³

2009

Nuclear Instruments and Methods in Physics Research Section A:

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“…However, some authors assign it to zinc interstitial positions [19]. When the emission is yellow, orange and red, like in our case, it is mainly related to an excess of oxygen [18,20], oxygen interstitials [21][22][23] or zinc vacancies [20]. In our measurements we observe that the ratio of the intensities for visible defects-related band in respect to the UV band-to-band radiative recombination is much larger for the air annealed sample, which indicates a significant incorporation of oxygen and, thus, a reduction of oxygen vacancies.…”

Section: Resultsmentioning

confidence: 99%

Activation of visible up-conversion luminescence in transparent and conducting ZnO:Er:Yb films by laser annealing

Lluscà

López-Vidrier

Lauzurica

et al. 2015

Journal of Luminescence

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“…Moreover, the oscillator strength along with absorption coefficients is often used as a method for calculating the concentration of impurities in a host. The oscillator strength of electric dipole-allowed transitions (Wu et al 2001) is given by the following relation (4): where k is the emission wavelength, p is the transition probability of the corresponding radiative transition, and 'n' is the index of refraction of the material which is 1.45 in the case of AgNWs. The spontaneous radiative lifetime is seen to be related in a simple way to the integrated cross section of the transition (Wu et al 2001) by the following relation:…”

Section: Resultsmentioning

confidence: 99%

Microwave-assisted synthesis and characterization of silver nanowires by polyol process

et al. 2014

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Silver nanowires have been synthesized by the polyol process with ethylene glycol as a reducing agent and polyvinylpyrrolidone as a stabilizer, using microwave technique. Crystallographic, topographic, and morphological characterizations of the synthesized nanostructures have been studied via powder X-ray diffraction and electron microscopy (Field Emission Scanning Electron Microscope) and Transmission Electron Microscope, respectively. Fourier Transform-Infrared Spectroscopy, UV-Vis absorption spectroscopy, Raman spectroscopy, Thermogravometric analysis, and X-ray photoelectron spectroscopy have been carried out for the detailed quantitative and qualitative analyses. Optical characterizations of the synthesized silver nanowires have been concluded via energy-resolved and time-resolved photoluminescence and energy dispersive X-ray spectroscopic studies, respectively. Spectroscopic studies confirm the formation of good-quality silver nanowires. The X-ray photoelectron spectroscopy investigation and Raman spectra further show that the PVP molecules are adsorbed on the surface of Ag nanowires through Ag: O coordination. A possible growth mechanism of the Ag nanowires has been proposed. It is implied that the PVP molecules are used as both a protecting agent and a structure-directing agent for the growth of Ag nanowires. These studies confirm the formation of high-quality silver nanowires. Topographic and morphological studies confirm that average grain size of silver nanowires is in the nanometer range.

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Photoluminescence and cathodoluminescence studies of stoichiometric and oxygen-deficient ZnO films

Cited by 1,008 publications

References 10 publications

Development of ZnO:Ga as an ultra-fast scintillator

Development of ZnO:Ga as an ultra-fast scintillator

Activation of visible up-conversion luminescence in transparent and conducting ZnO:Er:Yb films by laser annealing

Microwave-assisted synthesis and characterization of silver nanowires by polyol process

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