This article is cited in 3 papers

Dielectrics

Luminescence and electronic excitations in KBe$_2$BO$_3$F$_2$ crystals

I. N. Ogorodnikov^a, V. A. Pustovarov^a, S. A. Yakovlev^a, L. I. Isaenko^b, S. A. Zhurkov<sup>b

a</sup> Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
^b Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: This paper reports on a study of the dynamics of electronic excitations in KBe$_2$BO$_3$F$_2$ (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.

Received: 04.10.2011

 English version: Physics of the Solid State, 2012, 54:4, 735–740

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