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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 5 — May. 1, 2012
  • pp: 1003–1011

Photoluminescence of lithium thiogallate LiGaS2

Alexander P. Yelisseyev, Marina K. Starikova, Valery V. Korolev, Ludmila I. Isaenko, and Sergey I. Lobanov  »View Author Affiliations


JOSA B, Vol. 29, Issue 5, pp. 1003-1011 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001003


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Abstract

Annealing in appropriate atmosphere affects considerably transparency and photoluminescence (PL) of lithium thiogallate LiGaS2 (LGS). Intense absorption at 8.0 μm after annealing in vapors of Ga2S3 or S is related to SS 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 τ=19μs 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

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(300.6250) Spectroscopy : Spectroscopy, condensed matter
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Spectroscopy

History
Original Manuscript: November 14, 2011
Revised Manuscript: January 16, 2012
Manuscript Accepted: January 31, 2012
Published: April 18, 2012

Citation
Alexander P. Yelisseyev, Marina K. Starikova, Valery V. Korolev, Ludmila I. Isaenko, and Sergey I. Lobanov, "Photoluminescence of lithium thiogallate LiGaS2," J. Opt. Soc. Am. B 29, 1003-1011 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-5-1003

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