Abstract
The presented work is dedicated to the study and comparison of scintillating properties of zinc oxide samples prepared in different morphologies: whiskers, nanowalls, multipods, and ceramics. It was shown that total transmittance, photo- and radioluminescence spectra, and radioluminescence kinetics can vary significantly depending on sample structure and preparation conditions. The highest total transmittance was registered for ZnO ceramics (>50% at 0.5 mm thickness). Differences in the transmittance of whiskers, nanowalls, and multipods can be attributed to their shape and thickness which affects the amount of light refraction and scattering. The study of radioluminescence demonstrated that all samples, except undoped ceramics and air annealed whiskers, have predominantly fast luminescence with a decay time <1 ns. High transmittance of ceramics opens the way for their use in the registration of high energy X-ray and gamma radiation, where a large volume of scintillators is required. In cases, where large scintillator thickness is not a necessity, one may prefer to use other ZnO structures, such as ensembles of whiskers and nanowalls. Studies of near-band-edge luminescence components at low temperatures showed that the structure is quite similar in all samples except Ga doped ceramics.
Highlights
The development of modern accelerators follows the path of increasing energies and higher luminosity, giving rise to the demand for detectors with improved characteristics and higher reliability
Various authors have reported on ways to improve the spatial and temporal resolution of scintillators based on zinc oxide (ZnO) [3,4]
This paper presents the results of the analysis of whiskers, nanowalls, and multipods which were obtained within 20 min
Summary
The development of modern accelerators follows the path of increasing energies and higher luminosity, giving rise to the demand for detectors with improved characteristics and higher reliability. Fabricating a scintillator with a high light output and a short response time is a challenge. In this regard, zinc oxide (ZnO) is one of the most promising materials. ZnO is a wide direct band gap semiconductor with Eg ~ 3.3 eV at room temperature (RT) [1]. The high exciton binding energy (~60 meV) allows for the observance of a high-intensity excitonic luminescence at and above room temperature [1]. Various authors have reported on ways to improve the spatial and temporal resolution of scintillators based on ZnO [3,4]
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