Annealing in appropriate atmosphere affects considerably transparency and photoluminescence (PL) of lithium thiogallate ${\mathrm{LiGaS}}_2$ (LGS). Intense absorption at 8.0 μm after annealing in vapors of ${\mathrm{Ga}}_2{\mathrm{S}}_3$ or $\mathrm{S}$ is related to $\mathrm{S}–\mathrm{S}$ vibrations. Annealing in vacuum produces intense blue PL in a 2.74 band, which transforms further to a 2.98 eV band: both emissions are excited in the same 3.4 eV band and are associated with two types of crystallographically nonequivalent anion vacancies ($F$-centers). The 2.98 eV emission of a more stable $F$-center decays exponentially with decay times $\tau =19\mathrm{\mu s}$ and 218 ns at 80 and 300 K, respectively, and quenches to 650 K. PL in a 2.0 eV band, excited near the fundamental absorption edge, with a large Stokes shift and fast temperature quenching is related to recombination of the self-trapped excitons. LGS with $F$-centers can be used as a light-emitting medium in different laser and optoelectronic devices.

© 2012 Optical Society of America

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