Wu Hongping, Zhang Bingbing, Yu Hongwei, Hu Zhanggui, Wang Jiyang, Wu Yicheng, Halasyamani P Shiv
Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin, 300384, China.
College of Chemistry and Environmental Science, Hebei University, 180 East Wusi Road, Baoding, 071002, China.
Angew Chem Int Ed Engl. 2020 Jun 2;59(23):8922-8926. doi: 10.1002/anie.202001855. Epub 2020 Mar 24.
Discovering new deep-ultraviolet (DUV) nonlinear optical (NLO) materials is currently a great challenge. The reported DUV NLO materials are almost exclusively borates or phosphates. Silicates-the largest constituent of the earth's crust-are excluded owing to their weak second harmonic generation (SHG) response. We report a silicate, Li BaSiO , with edge-sharing LiO -SiO tetrahedra that achieves the balance between a short UV absorption edge, below 190 nm, and a large SHG response, 2.8×KDP. The SHG intensity is the largest for silicates without second-order Jahn-Teller cations, and exceeds that of non-isomorphic Li SrSiO by more than an order of magnitude. As such Li BaSiO may be seen as a promising DUV-UV NLO material. This research indicates that edge-sharing tetrahedra is a new design parameter for discovering new DUV NLO materials.
发现新型深紫外（DUV）非线性光学（NLO）材料目前是一项巨大挑战。已报道的深紫外非线性光学材料几乎全是硼酸盐或磷酸盐。硅酸盐作为地壳的最大组成部分，因其较弱的二次谐波产生（SHG）响应而被排除在外。我们报道了一种硅酸盐Li₂BaSiO₄，其具有共边的LiO₄ -SiO₄四面体结构，该结构在低于190 nm的短紫外吸收边和2.8×KDP的大SHG响应之间实现了平衡。对于不含二阶 Jahn -Teller阳离子的硅酸盐，其SHG强度最大，并且比非同构的Li₂SrSiO₄的SHG强度高出一个多数量级。因此，Li₂BaSiO₄可被视为一种有前景的深紫外 - 紫外非线性光学材料。这项研究表明，共边四面体是发现新型深紫外非线性光学材料的一个新设计参数。
