Containing Three Cyano Furan Synthesis And Properties Of Organic Nonlinear Optical Materials

Nonlinear optics (NLO) is one of the basic theories of photoelectron technology. As the key materials for integrated optical component, these materials have attracted more and more attention due to their advantages.In this thesis, the molecular design theories of organic NLO materials are briefly introduced and the research progress of second order NLO materials is reviewed. Based on references and our preliminary investigations, we have designed ten chromophores which contain conjugating bridges of benzene, furan or azobenzene. The structures of those chromophores are optimized and the static second order polarizability (β0) are calculated using DFT-B3LYP/6-31G method. The results reveal that the designed molecules possess largeβ0 values, and the hyperpolarizability is as large as 2.129×10-27esu.All the chromophores have been synthesized successfully and new methods have been proposed for the synthesis of furan-containing chromophores. The structures of the primary products have been characterized by 1H-NMR,IR spectrum and elementary analysis.TGA analysis of the chromophores is performed and the result implies that there is only 5% weight loss of the sample at 301℃. All the materials display excellent heat resistance to meet the request of devices' preparation.The NLO properties of the chromophores at the frequency of 1064nm are measured by solvatochromism method. The result shows that the materials possess largeμgβ(1064nm)values and the maximum value is 59706×10-48esu. The calculated and tested results indicate the materials with these structures of tricyanofuran exhibit excellent NLO performance.The chromophores with furan bridge and diethylamine donor are doped into polysulfone to prepare film by spin-coating method. The second harmonic generation (SHG) coefficient (d33) of corona-poled polymer films is measured to be 70pm/V at 1064nm.