Chen Lujian, Qian Guodong, Jin Xuefeng, Cui Yuanjing, Gao Junkuo, Wang Zhiyu, Wang Minquan
Department of Materials Science and Engineering, State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, P. R. China.
J Phys Chem B. 2007 Mar 29;111(12):3115-21. doi: 10.1021/jp0674975. Epub 2007 Mar 7.
Two bulky alkoxysilane dyes based on nonlinear optical (NLO)-active triphenylamino derivatives possessing high thermal stabilities, without and with a cyano group substitution on the vinylene moiety (TPAH and TPACN, respectively), were synthesized, characterized, and copolymerized with tetraalkoxysilane (TEOS) with the ratio of 1:5. After a poling and curing process, the resulting side-chain-type sol-gel films with excellent optical qualities were achieved. Second-order NLO coefficients, d33, of 10-20 pm/V have been obtained in the films incorporated with different types of NLO-active dyes. The variation of chromophoric structures on NLO properties was investigated, indicating that the cyano substitution on the vinylene bridge of the chromophore would greatly enhance the temporal stability. This work provides a potential design strategy based on molecular engineering which would lead to more stable dipole orientation.
合成并表征了两种基于具有高热稳定性的非线性光学（NLO）活性三苯胺衍生物的 bulky 烷氧基硅烷染料，分别是在亚乙烯基部分没有和有氰基取代的（分别为 TPAH 和 TPACN），并与四烷氧基硅烷（TEOS）以 1:5 的比例共聚。经过极化和固化过程，获得了具有优异光学质量的侧链型溶胶 - 凝胶薄膜。在掺入不同类型 NLO 活性染料的薄膜中获得了 10 - 20 pm/V 的二阶 NLO 系数 d33。研究了发色团结构对 NLO 性质的影响，表明发色团亚乙烯基桥上的氰基取代会大大提高时间稳定性。这项工作提供了一种基于分子工程的潜在设计策略，这将导致更稳定的偶极取向。
