Luminescence and electronic excitations in KBe2BO3F2 crystals |
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| Authors: | I. N. Ogorodnikov V. A. Pustovarov S. A. Yakovlev L. I. Isaenko S. A. Zhurkov |
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| Affiliation: | 1.Yeltsin Ural Federal University (Ural State Technical University-UPI),Yekaterinburg,Russia;2.Sobolev Institute of Geology and Mineralogy,Siberian Branch of the Russian Academy of Sciences,Novosibirsk,Russia |
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| Abstract: | This paper reports on a study of the dynamics of electronic excitations in KBe2BO3F2 (KBBF) crystals by low-temperature luminescent vacuum ultraviolet spectroscopy with nanosecond time resolution under photoexcitation by synchrotron radiation. The first data have been obtained on the kinetics of photoluminescence (PL) decay, time-resolved PL spectra, time-resolved PL excitation spectra, and reflection spectra at 7 K; the estimation has been performed for the band gap E g = 10.6−11.0 eV; the predominantly excitonic mechanism for PL excitation at 3.88 eV has been identified; and defect luminescence bands at 3.03 and 4.30 eV have been revealed. The channels of generation and decay of electronic excitations in KBBF crystals have been discussed. |
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