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Time-resolved luminescence of defects and Cr3+ impurity centers in nanosized alumina crystals under vacuum-ultraviolet excitation

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Abstract

The photoluminescence (PL) of intrinsic defects and Cr3+ impurity centers in nanosized alumina (Al2O3) crystals of various phase compositions (δ + θ and α phases) has been studied by the method of time-resolved spectroscopy with vacuum-ultraviolet (VUV) excitation at T = 7.5 and 295 K. It is established that the PL excitation spectrum and its kinetic parameters for α-Al2O3 phase can change depending on the crystal grain size. In α-Al2O3 samples with grain sizes below 100 nm, excitons localized on Cr3+ impurity centers and surface-modified defects of the crystal structure are observed even at T = 295 K. Manifestations of these exciton states in the PL spectra strongly depend on the grain size.

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Authors and Affiliations

  1. Ural Federal University, Yekaterinburg, 620002, Russia

    V. A. Pustovarov & V. S. Kortov

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  1. V. A. Pustovarov
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  2. V. S. Kortov
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Correspondence to V. A. Pustovarov.

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Original Russian Text © V.A. Pustovarov, V.S. Kortov, 2012, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2012, Vol. 38, No. 11, pp. 31–39.

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Pustovarov, V.A., Kortov, V.S. Time-resolved luminescence of defects and Cr3+ impurity centers in nanosized alumina crystals under vacuum-ultraviolet excitation. Tech. Phys. Lett. 38, 511–515 (2012). https://doi.org/10.1134/S1063785012060132

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  • DOI: https://doi.org/10.1134/S1063785012060132

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