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Low-temperature time-resolved vacuum UV spectroscopy of potassium pentaborate crystals

  • Solid-State Spectroscopy
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Abstract

For the first time, subnanosecond time resolution is attained in the low-temperature (at 7 K) measurements of the photoluminescence (PL) spectra (2–6 eV), the PL excitation spectra (4–32 eV), the PL kinetics, and the reflection spectra (4–21 eV) of undoped potassium pentaborate KB5O8·4H2O (KB5) crystals under selective photoexcitation by synchrotron radiation. The PL peaks associated with the intrinsic defects of the KB5 lattice are detected. The PL bands resulting from radiative annihilation of the localized and self-localized electron excitations are singled out; these excitations are most efficiently photogenerated at the fundamental absorption edge in the region where the free exciton formation is expected. The difference between the PL spectra of the fast and slow components is revealed. An effective low-temperature energy transport over the KB5 hydrogen sublattice is deduced from a drop in efficiency of PL excitation in the interband-transition region as a result of nonradiative energy loss. Long-term vacuum UV irradiation of a KB5 crystal at 7 K gives rise to defects in the hydrogen sublattice, which facilitate localization of the electron excitations and reduce the effective length of their diffusion. This leads to a decrease in the nonradiative energy loss, thus enhancing the efficiency of the PL photoexcitation in the band-to-band transition region.

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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. Institut für Experimentalphysik der Universität Hamburg, Luruper Chaussee 149, D-22761, Hamburg, Germany

    M. Kirm

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

    L. I. Isaenko

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

Translated from Optika i Spektroskopiya, Vol. 92, No. 5, 2002, pp. 766–774.

Original Russian Text Copyright © 2002 by Ogorodnikov, Pustovarov, Kirm, Kruzhalov, Isaenko.

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Ogorodnikov, I.N., Pustovarov, V.A., Kirm, M. et al. Low-temperature time-resolved vacuum UV spectroscopy of potassium pentaborate crystals. Opt. Spectrosc. 92, 702–709 (2002). https://doi.org/10.1134/1.1481135

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