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Thermophysical properties of lithium thiogallate that are important for optical applications

Lithium thiogallate LiGaS(2) is one of the most common nonlinear crystals for mid-IR due to its extreme beam strength and wide transparency range; however, its thermophysical properties have not yet been practically studied. Large crystals of high optical quality are grown. DTA revealed features at...

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Autores principales: Kurus, Alexey, Yelisseyev, Alexander, Lobanov, Sergei, Plyusnin, Pavel, Molokeev, Maxim, Solovyev, Leonid, Samoshkin, Dmitry, Stankus, Sergei, Melnikova, Svetlana, Isaenko, Lyudmila
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9044440/
https://www.ncbi.nlm.nih.gov/pubmed/35492447
http://dx.doi.org/10.1039/d1ra05698k
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author Kurus, Alexey
Yelisseyev, Alexander
Lobanov, Sergei
Plyusnin, Pavel
Molokeev, Maxim
Solovyev, Leonid
Samoshkin, Dmitry
Stankus, Sergei
Melnikova, Svetlana
Isaenko, Lyudmila
author_facet Kurus, Alexey
Yelisseyev, Alexander
Lobanov, Sergei
Plyusnin, Pavel
Molokeev, Maxim
Solovyev, Leonid
Samoshkin, Dmitry
Stankus, Sergei
Melnikova, Svetlana
Isaenko, Lyudmila
author_sort Kurus, Alexey
collection PubMed
description Lithium thiogallate LiGaS(2) is one of the most common nonlinear crystals for mid-IR due to its extreme beam strength and wide transparency range; however, its thermophysical properties have not yet been practically studied. Large crystals of high optical quality are grown. DTA revealed features at 1224 K below melting point (1304 K) that are associated with the oxygen containing compounds of the LiGaO(2−x)S(x) type. The thermal conductivity of LiGaS(2) (about 10.05 W (m(−1) K(−1))) and band gap value (3.93 eV at 300 K) are found to be the highest in the LiBC(2) family. Isotropic points in the dispersion characteristics for the refractive index are found and LiGaS(2)-based narrow-band optical filters, smoothly tunable with temperature changes, are demonstrated. Intense blue photoluminescence of anionic vacancies V(S) is observed at room temperature after annealing LiGaS(2) in vacuum, whereas orange low-temperature emission is related to self-trapped excitons. When LiGaS(2) crystals are heated, spontaneous luminescence (pyroluminescence) takes place, or thermoluminescence after preliminary UV excitation; the parameters of traps of charge carriers are estimated. The obtained data confirm the high optical stability of this material and open up prospects for the creation of new optical devices based on LiGaS(2).
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spelling pubmed-90444402022-04-28 Thermophysical properties of lithium thiogallate that are important for optical applications Kurus, Alexey Yelisseyev, Alexander Lobanov, Sergei Plyusnin, Pavel Molokeev, Maxim Solovyev, Leonid Samoshkin, Dmitry Stankus, Sergei Melnikova, Svetlana Isaenko, Lyudmila RSC Adv Chemistry Lithium thiogallate LiGaS(2) is one of the most common nonlinear crystals for mid-IR due to its extreme beam strength and wide transparency range; however, its thermophysical properties have not yet been practically studied. Large crystals of high optical quality are grown. DTA revealed features at 1224 K below melting point (1304 K) that are associated with the oxygen containing compounds of the LiGaO(2−x)S(x) type. The thermal conductivity of LiGaS(2) (about 10.05 W (m(−1) K(−1))) and band gap value (3.93 eV at 300 K) are found to be the highest in the LiBC(2) family. Isotropic points in the dispersion characteristics for the refractive index are found and LiGaS(2)-based narrow-band optical filters, smoothly tunable with temperature changes, are demonstrated. Intense blue photoluminescence of anionic vacancies V(S) is observed at room temperature after annealing LiGaS(2) in vacuum, whereas orange low-temperature emission is related to self-trapped excitons. When LiGaS(2) crystals are heated, spontaneous luminescence (pyroluminescence) takes place, or thermoluminescence after preliminary UV excitation; the parameters of traps of charge carriers are estimated. The obtained data confirm the high optical stability of this material and open up prospects for the creation of new optical devices based on LiGaS(2). The Royal Society of Chemistry 2021-12-08 /pmc/articles/PMC9044440/ /pubmed/35492447 http://dx.doi.org/10.1039/d1ra05698k Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Kurus, Alexey
Yelisseyev, Alexander
Lobanov, Sergei
Plyusnin, Pavel
Molokeev, Maxim
Solovyev, Leonid
Samoshkin, Dmitry
Stankus, Sergei
Melnikova, Svetlana
Isaenko, Lyudmila
Thermophysical properties of lithium thiogallate that are important for optical applications
title Thermophysical properties of lithium thiogallate that are important for optical applications
title_full Thermophysical properties of lithium thiogallate that are important for optical applications
title_fullStr Thermophysical properties of lithium thiogallate that are important for optical applications
title_full_unstemmed Thermophysical properties of lithium thiogallate that are important for optical applications
title_short Thermophysical properties of lithium thiogallate that are important for optical applications
title_sort thermophysical properties of lithium thiogallate that are important for optical applications
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9044440/
https://www.ncbi.nlm.nih.gov/pubmed/35492447
http://dx.doi.org/10.1039/d1ra05698k
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