Three new six-branched chromophores with different isolation groups were designed and synthesized by incorporating azo chromophores onto phenyl glycerol ester via an esterification reaction. The chemical structures were confirmed by 1H NMR, 13C NMR, FT-IR spectroscopy, mass spectrometry, element analysis and UV-visible absorption spectra. The six-branched dendritic chromophores can form thin films directly without adding any polymer matrix and show a quite high chromophore loading density. After electric poling, the nonlinear optical coefficients (d33) of the dendrimer films were determined to be around 113, 142 and 136 pm V−1, which are almost 3 times the maximum d33 value of the azo-chromophore doped polymer films. The further improvement in optical nonlinearity was successfully realized by mixing the six-branched chromophores containing different isolation groups.
Two new multi-branched chromophores were synthesized via esterification from monochromophores to achieve ideal macroscopic nonlinearoptical activities. Molecular chemical structures of chromophores were confirmed by 1H NMR, FT-IR spectroscopy, elemental analysis, mass spectrometry and UV–visible absorption spectra. Monochromophore N1 and bichromophore DN were doped into poly (4-vinylphenol) to fabricate
通过酯化反应从单色团合成了两个新的多支化色团,以实现理想的宏观非线性光学活性。发色团的分子化学结构通过1 H NMR,FT-IR光谱,元素分析,质谱和UV-可见吸收光谱确定。将单发色团N1和双发色团DN掺杂到聚(4-乙烯基苯酚)中,以制备具有高分子负载密度(最高30 wt%)的客体-主体聚合物膜Film-N1和Film-DN。聚合物膜Film-N1和Film-DN的最大二次谐波产生系数(d 33)达到25 pm V-1和39 pm V -1。与此相反,六支树突生色SN直接用于制备薄膜膜-SN没有任何聚合物基质由于其分子量大(约3183道尔顿)和d 33的值电影-SN达208分V - 1。与Film-N1相比,含有多支发色团Film-DN和Film-SN的薄膜在d 33中显示出约1.6倍和8.3倍的增强 表示多支发色团的值可以通过位点隔离效应显着促进宏观光学非线性。