Research progress on UV nonlinear crystal materials of bismuth zinc borate by Xinjiang Institute of Physics and Chemistry
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Comparison of Crystal Structures of Cs3Zn6B9O21 and KBBF
Ultraviolet (UV) nonlinear optical crystals play a crucial role in modern optoelectronic technologies, with broad applications in fields such as information technology, energy, manufacturing, medicine, and scientific research. Developing new UV nonlinear optical materials with excellent performance and synthetic feasibility has been a key focus in the field of functional materials for many years.
Bismuth-based borates have attracted significant attention as promising candidates for UV and deep ultraviolet (DUV) nonlinear optical materials. However, the synthesis of high-performance lanthanum borate crystals has been challenging due to the toxicity of BeO, which is commonly used in traditional structures like KBBF.
A research team led by Professor Pan Shilie from the Institute of Physical and Chemical Technology, Chinese Academy of Sciences, successfully synthesized Cs3Zn6B9O21 by modifying the KBBF structure. They replaced the toxic BeO3F units with ZnO4 groups and reorganized the B3O6 units to connect adjacent Zn2BO3O2 layers. This new compound overcomes the strong lamellar growth habit of KBBF and eliminates the need for BeO, making it a safer and more practical option.
Cs3Zn6B9O21 exhibits an UV cutoff edge around 200 nm and a birefringence greater than 0.06 in the visible range, indicating its potential as a next-generation UV nonlinear optical material. The design concept also provides a new pathway for enhancing the performance of lanthanide-based borates and exploring other zinc borate compounds with similar structural features.
This breakthrough was published as an online communication in the J. Am. Chem. Soc., and related findings have been protected by Chinese invention patents. In addition, the research group has developed several novel nonlinear optical materials with large harmonic frequency and short UV cutoff edges, including Cs2B4SiO9 and Ba4B11O20F, which were reported in Angew. Chem. Int. Ed. and J. Am. Chem. Soc., respectively.
The work was supported by multiple national projects, including the National "973" Pre-research Program, the National Natural Science Foundation of China, the Chinese Academy of Sciences' "Introduction of Foreign Outstanding Personnel" program, and the Knowledge Innovation Project of the Chinese Academy of Sciences.
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