Process for realization of polymeric materials with second order nonlinear electro-optical properties and electro-optical devices made with said material

• Main Authors: CARELLA ANTONIO, CASALBONI MAURO, DE MATTEIS FABIO, STRACCI GLAUCO, DISPENZA MASSIMILIANO, CENTORE ROBERTO, ROVIELLO ANTONIO, BORBONE FABIO
• Format: Patent
• Language: Chinese; English
• Published: 12.09.2012
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The present invention relates to a process for realization of polymeric materials with second order nonlinear electro-optical properties, comprising mixing and isolation of bi- or tri-isocyanate NLO chromophores; reacting the NLO chromophores with reactive substances composed of formamides and/or acylamides, in order to obtain a prepolymer mixture; coating of said prepolymer mixture on a substrate and evaporation of solvents; cross-linking and poling of a thin layer on the substrate, by means of heating and application of an electric field, in order to obtain a cross-linked and poled thin layer; cooling of said thin layer at ambient temperature maintaining the applied poling electric field; and switching off the poling electric field. The invention also relates to a process for the realization of an electro-optical device by definition of optical paths and driving electrodes in a polymeric material with second order nonlinear properties. The material of the invention has the NLO activity comparable to lithium