Wang Xiaoxiao, Jiang Xingxing, Liu Hongming, Yang Lei, Lin Zheshuai, Hu Zhanggui, Meng Xianggao, Chen Xingguo, Qin Jingui
Hubei Key Laboratory on Organic and Polymeric Opto-electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
Dalton Trans. 2018 Feb 6;47(6):1911-1917. doi: 10.1039/c7dt04443g.
Using an ion-substitution strategy, herein, a new polar material, Pb(SeO)Br, with a greatly enhanced SHG response has been successfully designed and synthesized through a hydrothermal reaction. Pb(SeO)Br crystallizes in the NCS space group P222 and consists of a three-dimensional framework formed by interconnecting one-dimensional chains, with a good thermal stability up to 230 °C. This compound exhibits a phase-matchable SHG response as strong as that of KHPO (KDP) and a relatively wide mid-infrared (mid-IR) transparent window. Moreover, the optical band gap of Pb(SeO)Br reaches about 3.35 eV, thus leading to a high laser damage threshold (LDT) of 67 MW cm, which is over 12 times that of AgGaS (<5 MW cm) measured under the same condition. All these findings suggest that Pb(SeO)Br would be a candidate for an NLO material in the mid-IR region.
在此，通过离子取代策略，利用水热反应成功设计并合成了一种具有大大增强的倍频（SHG）响应的新型极性材料Pb(SeO)Br。Pb(SeO)Br属于NCS空间群P222，由相互连接的一维链形成三维骨架结构，在高达230°C的温度下具有良好的热稳定性。该化合物表现出与磷酸二氢钾（KDP）相当的可相位匹配的SHG响应以及相对较宽的中红外（mid-IR）透明窗口。此外，Pb(SeO)Br的光学带隙约为3.35 eV，因此导致67 MW cm的高激光损伤阈值（LDT），这是在相同条件下测得的硫化镓银（<5 MW cm）的12倍以上。所有这些发现表明，Pb(SeO)Br有望成为中红外区域的一种非线性光学（NLO）材料。
