Wenbin Zhang
(, ), Yabo Wu
(, ), Zhihua Yang
(, ), Shujuan Han
(, ), Shilie Pan
(, )
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K3[HCO3]2F: a new deep-UV birefringent crystal exhibiting strong optical anisotropy
A fundamental challenge in investigating novel deep-ultraviolet (DUV) birefringent crystals with superior performance is to establish an optimal balance between the bandgap (>6.2 eV) and birefringence (>0.1@1064 nm) properties. In the case of carbonates, the relatively narrow bandgap makes a significant restriction on their potential applications in the DUV region. Herein, the highly electronegative F element and hydrogen bonding synergistically construct a novel carbonate fluoride, K3[HCO3]2F. The coplanar arrangement of π-conjugated [HCO3] triangles allows the compound to exhibit a large birefringence (0.165@532 nm). The UV cutoff edge of K3[HCO3]2F is shorter than 188 nm, further indicating that K3[HCO3]2F has a potential application in DUV region as the birefringent crystal. Theoretical calculations reveal that the isolated [HCO3·F·HCO3] block is the main cause of the birefringence.
期刊介绍：
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.
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