Silsesquioxane-chromophore

Another limitation of the silsesquioxane approach is evident when a non-linear optic NLO dye is used as the R group. For these chromophores, relaxation is dependent on the rigidity of the matrix. Their anchoring to one —SiOi 5 unit was found to be insufficient to achieve a highly cross-linked Si—O—Si network around the NLO chromophore and its relaxation could not be restricted. As a consequence, the order that is initially induced in the material by an electrical field pooling effect is lost upon ageing82 83. 

---