Hydroxyfluorooxoborate Na[B3O3F2(OH)2].[B(OH)3]: Optimizing the Optical Anisotropy with Heteroanionic Units for Deep Ultraviolet Birefringent Crystals
Hydroxyfluorooxoborate Na[B3O3F2(OH)2].[B(OH)3]: Optimizing the Optical Anisotropy with Heteroanionic Units for Deep Ultraviolet Birefringent Crystals
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羟基氟氧硼酸钠[B3O3F2（OH）2]。[B（OH）3]：用杂阴离子单元优化深紫外双折射晶体的光学各向异性
DOI：
10.1002/anie.202107291
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发表时间：
2021-08-01
影响因子：
16.6
通讯作者：
Pan, Shilie
中科院分区：
文献类型：
--
作者：
Jin, Congcong;Shi, Xuping;Pan, Shilie
最大化双折射材料中的光学各向异性已经成为调制偏振相关光传播的有效途径。目前，200 nm以下的深紫外（deep-UV）偏振光的产生是必不可少的，但由于高性能双折射晶体的跨学科意义和不足而具有挑战性。在此，通过引入多个杂阴离子单元，第一种二氟二羟基三硼酸钠-硼酸Na[B3 O3 F2（OH）（2）]。[B（OH）（3）]是一种新型的深紫外双折射晶体。两种稀有的杂阴离子单元[B3 O3 F2（OH）（2）]和[B（OH）（3）]最佳地排列以诱导大的光学各向异性，并且悬挂键被氢消除，这导致极大的双折射和带隙。通过多种方法确定了[B_3O_3F_2（OH）（2）]和[B（OH）（3）]中有序的OH/F阴离子，并从理论上讨论了大双折射的成因。这些结果证实了利用氢参与的杂阴离子单元设计具有大双折射的晶体的可行性，并且还扩展了具有新的羟基氟氧硼酸盐的深紫外双折射晶体的替代系统。
Maximizing the optical anisotropy in birefringent materials has emerged as an efficient route for modulating the polarization-dependent light propagation. Currently, the generation of deep-ultraviolet (deep-UV) polarized light below 200 nm is essential but challenging due to the interdisciplinary significance and insufficiency of high-performing birefringent crystals. Herein, by introducing multiple heteroanionic units, the first sodium difluorodihydroxytriborate-boric acid Na[B3O3F2(OH)(2)].[B(OH)(3)] has been characterized as a novel deep-UV birefringent crystal. Two rare heteroanionic units, [B3O3F2(OH)(2)] and [B(OH)(3)], optimally align to induce large optical anisotropy and also the dangling bonds are eliminated with hydrogens, which results in an extremely large birefringence and band gap. The well-ordered OH/F anions in [B3O3F2(OH)(2)] and [B(OH)(3)] were identified and confirmed by various approaches, and also the origin of large birefringence was theoretically discussed. These results confirm the feasibility of utilizing hydrogen involved heteroanionic units to design crystals with large birefringence, and also expand the alternative system of deep-UV birefringent crystals with new hydroxyfluorooxoborates.