28 January 2005 Photo-isomerization induced rapid photodegradation of optical nonlinearity in cyano-substituted stilbene derivative doped poled polymer
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Abstract
Although it is expected that, the C=C bond strength will increase after introducing the cyano side-group, thus its photo-stability should be improved. But after careful study, we found that when exposed to light, the introduction of cyano group makes the new molecule alpha'-cyano-4'-nitro-4-N, N-dimethylaminostilbene (CNDS) to isomerize much easier than 4'-N,N-dimethylamino-nitrostilbene DANS. SHG, FTIR, UV-visible absorption and optical pump induced anisotropic absorption measurements were done to support our conclusions. Careful study of the photoinduced optical anisotropy(POA) shows that the isomerization of CNDS is a little smaller than the azo-dye molecule dimethylamino-nitroazobenzene (DMANAB). Explanation was given based on trans-cis quantum yields, de-planar molecular structure which induces small order of orientation and slower thermal relaxation.
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Liyong Ji, Liying Liu, Mingxin Ye, Lei Xu, Wencheng Wang, "Photo-isomerization induced rapid photodegradation of optical nonlinearity in cyano-substituted stilbene derivative doped poled polymer", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.576781; https://doi.org/10.1117/12.576781
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