Abstract

The electronic structure properties of undoped single crystals of ${\mathrm{LiBaAlF}}_6$ (LBAF) were determined using low-temperature ($T=10\mathrm{K}$) time-resolved far-ultraviolet (3.7–40 eV) synchrotron radiation spectroscopy, calculations for the spectra of optical functions, and x-ray photoelectron spectroscopy. The bandgap of the investigated compound was found at $E_{\mathrm{g}}=12.3\mathrm{eV}$, the energy threshold for creation of the unrelaxed excitons at $E_{n=1}=11.6\mathrm{eV}$, and the low-energy fundamental absorption edge at 11.0 eV. The subnanosecond photoluminescence emission band at 6.6 eV in LBAF single crystal is due to radiative valence-core transitions $2p{\mathrm{F}}^{-}\to 5p{\mathrm{Ba}}^{2+}$.

© 2014 Optical Society of America

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