School of Materials Science and Technology, China University of Geosciences , Beijing 100083, China.
J Am Chem Soc. 2013 Dec 11;135(49):18319-22. doi: 10.1021/ja410543w. Epub 2013 Nov 22.
Deep-UV coherent light generated by nonlinear optical (NLO) materials possesses highly important applications in photonic technologies. Beryllium borates comprising anionic planar layers have been shown to be the most promising deep UV NLO materials. Here, two novel NLO beryllium borates Na2Be4B4O11 and LiNa5Be12B12O33 have been developed through cationic structural engineering. The most closely arranged [Be2BO5]∞ planar layers, connected by the flexible [B2O5] groups, have been found in their structures. This structural regulation strategy successfully resulted in the largest second harmonic generation (SHG) effects in the layered beryllium borates, which is ~1.3 and 1.4 times that of KDP for Na2Be4B4O11 and LiNa5Be12B12O33, respectively. The deep-UV optical transmittance spectra based on single crystals indicated their short-wavelength cut-offs are down to ~170 nm. These results demonstrated that Na2Be4B4O11 and LiNa5Be12B12O33 possess very promising application as deep-UV NLO crystals.
由非线性光学（NLO）材料产生的深紫外相干光在光子技术中具有非常重要的应用。阴离子层状结构的硼酸铍已被证明是最有前途的深紫外 NLO 材料。在此，通过阳离子结构工程开发了两种新型 NLO 硼酸铍 Na2Be4B4O11 和 LiNa5Be12B12O33。在它们的结构中发现了最紧密排列的[Be2BO5]∞层状平面，由柔性[B2O5]基团连接。这种结构调节策略成功地使层状硼酸铍的二次谐波产生（SHG）效应达到最大，对于 Na2Be4B4O11 和 LiNa5Be12B12O33，其 SHG 效应分别约为 KDP 的 1.3 倍和 1.4 倍。基于单晶的深紫外透光光谱表明，它们的短波长截止值低至约 170nm。这些结果表明，Na2Be4B4O11 和 LiNa5Be12B12O33 有望作为深紫外 NLO 晶体得到应用。
