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Self-trapped excitons in LiB3O5 and Li2B4O7 lithium borates: Time-resolved low-temperature luminescence VUV spectroscopy

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Abstract

Results are reported of a coordinated investigation of the dynamics of electronic excitations in LiB3O5 and Li2B4O7 crystals by low-temperature luminescence VUV spectroscopy performed with subnano-second resolution under synchrotron photoexcitation. Data on the photoluminescence (PL) decay kinetics, time-resolved PL and PL excitation spectra, and reflectance spectra obtained at 295 and 9.6 K are reported for the first time; the PL of the borates in the 3.5-eV region caused by radiative annihilation of self-trapped excitons (STE) has been established to have an intrinsic nature; the σ and π STE luminescence bands originating from singlet and triplet radiative transitions have been isolated; the shift of the STE σ band relative to the π band has been interpreted; the LBO recombination luminescence band has been isolated; and the creation and decay channels of relaxed and unrelaxed excitons in lithium borates are discussed.

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Authors and Affiliations

  1. Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russia

    I. N. Ogorodnikov, V. A. Pustovarov & A. V. Kruzhalov

  2. Institute of Single Crystals, Siberian Division of the Russian Academy of Sciences, Novosibirsk, 630058, Russia

    L. I. Isaenko

  3. Institut für Experimentalphysik der Universität Hamburg, Hamburg, D-22761, Germany

    M. Kirm & G. Zimmerer

Authors
  1. I. N. Ogorodnikov
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  2. V. A. Pustovarov
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  3. A. V. Kruzhalov
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  4. L. I. Isaenko
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  5. M. Kirm
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  6. G. Zimmerer
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__________

Translated from Fizika Tverdogo Tela, Vol. 42, No. 3, 2000, pp. 454–462.

Original Russian Text Copyright © 2000 by Ogorodnikov, Pustovarov, Kruzhalov, Isaenko, Kirm, Zimmerer.

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Ogorodnikov, I.N., Pustovarov, V.A., Kruzhalov, A.V. et al. Self-trapped excitons in LiB3O5 and Li2B4O7 lithium borates: Time-resolved low-temperature luminescence VUV spectroscopy. Phys. Solid State 42, 464–472 (2000). https://doi.org/10.1134/1.1131232

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  • DOI: https://doi.org/10.1134/1.1131232

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