Abstract
Annealing in appropriate atmosphere affects considerably transparency and photoluminescence (PL) of lithium thiogallate (LGS). Intense absorption at 8.0 μm after annealing in vapors of or is related to 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 (-centers). The 2.98 eV emission of a more stable -center decays exponentially with decay times 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 -centers can be used as a light-emitting medium in different laser and optoelectronic devices.
©2012 Optical Society of America
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