Issue 35, 2022

LaBS3 revisited: a promising mid-infrared nonlinear optical material

Abstract

Thioborates are considered new potential mid-infrared nonlinear optical (NLO) crystals with wide band gaps and large second-harmonic generation (SHG) coefficients. Despite the fact that many rare-earth thioborates are structurally non-centrosymmetric, their SHG properties have only been studied very recently and their mid-infrared (Mid-IR) nonlinear optical properties have not yet been studied. In this work, we provide a new synthetic route for LaBS3 (LBS) by solid state reactions of La2S3, B and S with Li2S as flux, and we further study its thermal and optical properties, and theoretically explore the origin of its IR nonlinear optical properties by DFT calculations. Remarkably, LBS possesses balanced properties required for a good Mid-IR NLO crystal, a large SHG effect (1.2 × AgGaS2@2.05 μm – the largest among all known ortho-thioborates), a high laser induced-damage threshold (14 times of AgGaS2), a wide band gap (3.18 eV), a wide infrared transmission range (0.35–25 μm) and high thermal stability. Theoretical calculations suggest that its large SHG effect originates from the synergy effects of the π-conjugated [BS3]3− anions (41.82%) and the [LaS9]15− groups (58.18%).

Graphical abstract: LaBS3 revisited: a promising mid-infrared nonlinear optical material

Supplementary files

Article information

Article type
Communication
Submitted
27 jun. 2022
Accepted
09 ago. 2022
First published
10 ago. 2022

J. Mater. Chem. C, 2022,10, 12556-12559

LaBS3 revisited: a promising mid-infrared nonlinear optical material

Y. Han, C. Hu, Z. Fang, Q. Chen, B. Li, Y. Lin and J. Mao, J. Mater. Chem. C, 2022, 10, 12556 DOI: 10.1039/D2TC02699F

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