Structural Designs and Property Characterizations for Second-Harmonic Generation Materials
作者:Wen-Dan Cheng、Chen-Sheng Lin、Wei-Long Zhang、Hao Zhang
DOI:10.1007/430_2011_64
日期:——
Second-harmonic generation (SHG) materials only exist in solids that have no inversion center space groups, and they are constructed by the building blocks or chromophores of noncentrosymmetricity (NCS). In this chapter, we employed one or multiple chromophores that result from the coordination structure distortions of a d0 cation, polar displacement of d10 cation center, a stereochemically active lone pair (SCALP) of cations, and asymmetrical delocalization π-charge systems, as building blocks to obtain some new compounds with NCS space group. The single-crystal structures were characterized, and physical properties, in particular SHG responses, were measured for these compounds. The electronic structures and density of states were calculated by DFT method, and the SHG properties are simulated to gain an insight into the relations between structure and NLO properties for the materials. The electronic origination of large SHG responses was assigned in terms of the calculated results.
二次谐波生成(SHG)材料仅存在于没有反演中心的空间群的固体中,并由具有非中心对称性(NCS)的构件或染料组成。本章中,我们采用了由d0阳离子的配位结构畸变、d10阳离子中心的极性位移、阳离子的立体化学活性孤对(SCALP)以及不对称的去局域化π电荷系统构成的一种或多种染料作为构建块,以获得一些具有NCS空间群的新化合物。对这些化合物的单晶结构进行了表征,并测量了物理性质,特别是SHG响应。通过DFT方法计算了电子结构和态密度,并对SHG特性进行了模拟,以深入了解材料的结构与非线性光学(NLO)性质之间的关系。大SHG响应的电子来源根据计算结果进行了归因。