Abstract
The effect of morphology on the optical and X-ray luminescence properties of an ensemble of zinc oxide microrods on single-crystal sapphire substrates has been studied. It has been shown that the intensity of X-ray luminescence depends on the volume of the ZnO single-crystal phase and the corresponding effective density of the absorbing medium. It has been found that the total transmission spectra of the samples have a complex structure. The transmittance primarily depends on the conditions of synthesis and nucleation, on the morphology of ZnO microrods, and on the degree of their misorientation in an ensemble. An array of ZnO microrods characterized by the rapid component of the X-ray luminescence kinetics in the range of 0–5 ns with a descending time of about 0.7 ns (taking into account the pump pulse) has been obtained.
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Acknowledgments
We are grateful to V.I. Alshits for numerous stimulating discussions and constructive criticism.
Funding
This work was supported by the Ministry of Science and Higher Education of the Russian Federation (state assignment for the Federal Research Center Crystallography and Photonics, Russian Academy of Sciences) and by the Russian Foundation for Basic Research (project no. 18-29-12099 mk, fabrication and microscopic studies of the samples, and project no. 18-52-76002 ERA_a, study of the luminescence properties of the samples). The use of the equipment of the Shared-Access Center of the Federal Research Center Crystallography and Photonics was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. RFMEFI62119X0035).
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 4, pp. 240–245.
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Muslimov, A.E., Venevtsev, I.D., Zadorozhnaya, L.A. et al. Effect of the Morphology of an Ensemble of ZnO Microrods on the Optical and Luminescence Properties. Jetp Lett. 112, 225–229 (2020). https://doi.org/10.1134/S0021364020160092
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DOI: https://doi.org/10.1134/S0021364020160092