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 nonlinear optical (UNLO) materials play a crucial role in modern optoelectronics, with wide applications in information technology, energy conversion, industrial manufacturing, medical diagnostics, and scientific research. The development of new UNLO materials with superior performance has been a major focus in the field of advanced functional materials for many years.
Bismuth-based borate compounds have emerged as promising candidates for ultraviolet and deep ultraviolet (DUV) nonlinear optical applications. However, the synthesis of high-performance lanthanum borate crystals has faced challenges due to the toxicity of BeO, which is commonly used in such materials. This has made the growth of these crystals difficult and environmentally problematic.
Researchers at the Institute of Physical and Chemical Technology, Chinese Academy of Sciences, led by Professor Pan Shilie, have made significant progress in this area. By using KBBF as a structural model, they replaced BeO3F with ZnO4 units and reorganized the B3O6 groups to connect adjacent layers of Zn2BO3O2. This approach led to the successful synthesis of Cs3Zn6B9O21, a novel compound that overcomes the limitations of KBBF, such as its strong layering tendency and the toxic nature of BeO.
Cs3Zn6B9O21 exhibits the largest second-harmonic generation (SHG) effect among KBBF-related materials, with a UV cutoff edge around 200 nm. It also shows a birefringence greater than 0.06 in the visible range, making it a highly promising candidate for UV nonlinear optical applications.
This innovative design strategy not only enhances the performance of lanthanum borate compounds but also opens up new possibilities for the development of other zinc borate salts with similar structures for UV nonlinear optical applications.
The findings were published online in the Journal of the American Chemical Society as a "Communication Online." The research team has also filed several Chinese invention patents for their breakthroughs.
In addition to Cs3Zn6B9O21, the team has successfully designed and synthesized a series of novel nonlinear optical materials featuring large harmonic frequency and short UV cutoff edges. These include compounds like Cs2B4SiO9, Ba4B11O20F, and others, which were reported in prestigious journals such as Angewandte Chemie International Edition and the Journal of the American Chemical Society.
The research was supported by multiple funding programs, including the National "973" Pre-research Project, the National Natural Science Foundation of China, the Chinese Academy of Sciences' "Introduction of Foreign Outstanding Personnel" program, and other key projects under the CAS Knowledge Innovation Program.
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