Na2BaMQ4 (M=Ge, Sn; Q=S, Se): Infrared Nonlinear Optical Materials with Excellent Performances and that Undergo Structural Transformations

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• 作者：Dr. Kui Wu ; Prof. Zhihua Yang and Prof. Shilie Pan
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：June 1, 2016
• 年：2016
• 卷：55
• 期：23
• 页码：6713-6715
• 全文大小：1725K
• ISSN：1521-3773

文摘

Infrared nonlinear optical (IR NLO) materials with excellent performances are particularly important in laser technology. However, to design and synthesize an efficient IR NLO material with a balance between the optical band gap and the NLO coefficient is still a huge challenge. With this in mind, four new IR NLO materials Na₂BaSnS₄, Na₂BaSnSe₄, Na₂BaGeS₄, and Na₂BaGeSe₄ were successfully designed and synthesized. The compounds exhibit excellent properties with a suitable balance of band gap and NLO coefficient measured for Na₂BaSnS₄ (3.27 eV and about 17×KDP, that is, about 17 times that of KH₂PO₄ (KDP)) and Na₂BaGeS₄ (3.7 eV and about 10×KDP), demonstrating that the systems satisfy the key requirements as promising IR NLO candidates. Remarkably, the new compounds also undergo a novel structural transformation from tetragonal to trigonal systems, the first time that this has been reported for quaternary metal chalcogenides.