Chen Xinglong, Jo Hongil, Ok Kang Min
Department of Chemistry, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul, 04107, Korea.
Angew Chem Int Ed Engl. 2020 May 4;59(19):7514-7520. doi: 10.1002/anie.202002291. Epub 2020 Apr 8.
To design high-performance mid-infrared (mid-IR) nonlinear optical (NLO) materials, we have focused on the combination of a heavy metal lone pair cation, Pb and mixed oxyhalides. A systematic investigation in PbO-PbCl -PbBr system led us to discover the first examples of NLO lead mixed oxyhalides, namely, Pb O Cl Br , Pb O Cl Br , and Pb O Cl Br . All the reported materials have remarkably comprehensive properties including broad IR transparency (up to 14.0 μm), qualified second harmonic generation (SHG) responses (0.6-0.9×AgGaS ), wide band gaps (3.05-3.21 eV), and ease of crystal growth. Interestingly, a centimeter-sized single crystal (2.9×1.3×0.5 cm ) of Pb O Cl Br revealing a wide transparent range (0.384-14.0 μm) and high laser damage threshold (LDT) (14.6×AgGaS ) has been successfully grown in an open system. The study suggests that all the reported mixed oxyhalides are outstanding candidates for mid-IR NLO materials.
为了设计高性能的中红外非线性光学材料，我们专注于重金属孤对阳离子Pb与混合卤氧化物的组合。对PbO-PbCl-PbBr体系的系统研究使我们发现了首批非线性光学混合卤化铅实例，即PbOClBr、PbOClBr和PbOClBr。所有报道的材料都具有非常全面的性能，包括宽红外透明度（高达14.0μm）、合格的二次谐波产生（SHG）响应（0.6-0.9×AgGaS）、宽带隙（3.05-3.21eV）以及易于晶体生长。有趣的是，已在开放体系中成功生长出尺寸为厘米级的PbOClBr单晶（2.9×1.3×0.5cm），其显示出宽透明范围（0.384-14.0μm）和高激光损伤阈值（LDT）（14.6×AgGaS）。该研究表明，所有报道的混合卤氧化物都是中红外非线性光学材料的优秀候选者。
