Effect of chromophore-chromophore electrostatic interactions in the NLO response of functionalized organic-inorganic sol-gel materials

摘要: Abstract In the last years, important non-linear optical (NLO) results on sol–gel and polymeric materials have been reported, with values comparable to those found in crystals. These new contain push–pull chromophores either incorporated as guest a high T g matrix (doped polymers) or grafted onto matrix. systems present several advantages, however they require significant improvement at molecular level—by designing optimized very large figure of merit, specific each application targeted. Besides, it was recently stated polymers that chromophore–chromophore electrostatic interactions, which are dependent chromophore concentration, strong effect into their NLO properties. This has not explored all systems. this work, route used prepare hybrid organic–inorganic thin films different skeleton Combining engineering strategy for getting larger merit by controlling intermolecular dipole–dipole interactions through both: tuning concentration control tetraethoxysilane we obtained r 33 coefficient around 15 pm/V 633 nm classical DR1 azo-chromophore 50 831 structure.