基于酞菁光控自组装的超分子三阶非线性光开关材料  

Supramolecular Thied-order Nonlinear Optical Switches Based on the Photo-Controllable Assemblies of Phthalocyanines

作　　者：陈子辉[1,2,3] 张复实[1] 

机构地区：[1]清华大学化学系有机光电子与分子工程教育部重点实验室,北京100084 [2]清华大学物理系 [3]清华-富士康纳米科技研究中心,北京100084

出　　处：《影像技术》2011年第5期21-25,共5页Image Technology

基　　金：国家自然基金(20773077);博士后基金(20090460297);国家重点基础研究项目(2007CB808000)的大力资助

摘　　要：酞菁的三阶非线性光学性能不仅取决于其分子结构,而且与酞菁分子在空间的排列密切相关。因此,控制酞菁化合物在空间的排列状态,就有望在超分子的层次控制酞菁的三阶非线性光学性能。我们设计了三类含有光致变色单元修饰的酞菁化合物。利用紫外光和可见交替照射下光致变色单元光异构过程中空间结构和电子结构的改变,实现了对酞菁自组装行为的有效光控。我们用Z-扫描的方法考察了光照前后这些酞菁光控自组装体系三阶非线性光学性能的改变。发现:这些材料不仅开关效应显著,且在"开"和"关"的状态下,都具有大的二阶分子超极化率(>10-30esu),在未来光电子和光子技术领域具有潜在的应用价值。It is well known that the third-order nonlinear optical （3rd NLO） properties of phthalocyanines （Pcs） depend not only on the chemical structure of component monomers, but also on their packing arrangement, which provides the possibility to incorporate switchability into the 3rd NLO behavior of such materials at supramoleeular level. Herein, we rationally designed three kinds of novel photochromic moiety containing Pcs. By utilizing the photo-induced changes in the geometry and electronic deloealization distributions of photochromic moieties under the alternative illumination of suitable UV and visible light, the self-assemblies of Pcs were successfully photo-controlled in an efficient manner. As a consequence, a series of supramolecular 3rd NLO switching materials was obtained. All these materials showed very apparent difference in molecular second hyperpolarizabilities between ＂on＂ and ＂off＂ states. Besides, they also showed large molecular second hyperpolarizabilities at the order of 10-30 esu both in ＂on＂ and ＂off＂ states. All the results suggest that these materials are potential in emerging optoelectronics and photonic technologies.

关 键 词：酞菁 光控自组装 非线性光学 光开关材料 

分 类 号：O625[理学—有机化学] TB381[理学—化学]