Infrared Nonlinear Optical Polymorphs α- and β-SrCu 2 SnS 4 Exhibiting Large Second Harmonic Generation Responses with Requisite Phase-Matching Behavior

作者：Ya Yang, Kui Wu, Bingbing Zhang, Xiaowen Wu, Ming‐Hsien Lee · 发表于：Chemistry of Materials · 年份：2020 · DOI：10.1021/acs.chemmater.9b04842 · 被引用次数：44 · 研究领域：Crystal Structures and Properties、Chalcogenide Semiconductor Thin Films、Quantum Dots Synthesis And Properties

α- and β-SrCu 2 SnS 4 polymorphs, exhibiting special structural changes and excellent physicochemical performances, were successfully synthesized and characterized as promising IR NLO candidates. Note that they satisfy the essential phase-matching condition and have strong SHG responses about 0.7 and 1.0 times those of benchmark AgGaS 2 under 2.09 μm incident light, respectively, which agree well with the theoretical SHG coefficients and suitable birefringences based on first-principles calculation. Moreover, it is also verified that their SHG effects originate from the synergetic contribution between CuS 4 and SnS 4 ligands after the SHG density calculations.