Composition, electro-optic material, and method for preparing electro-optic material

A method of preparing a nonlinear optic material, comprising preparing a composition comprising (i) an organic chromophore comprising a functional group represented by Chemical Formula 3 at a terminal end, and which can be polarized by an electric field, (ii) a precursor that forms an inorganic material polymer by a sol-gel reaction, and (iii) a compatibilizer that is a polymer comprising a functional group represented by Chemical Formula 3 in the side chain:

• *-(L1)-(CH2)k-M′-(ORd)3 Chemical Formula 3
• wherein, in Chemical Formula 3,
• L1 is a single bond, —(C═O)O—, —O—, —S—, —SO2—, —NReRf—, —(C═O)NRg—, —O(C═O)NRh— (wherein Re to Rh are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C30 cycloalkyl group, or a substituted or unsubstituted C6 to C30 aryl group), or a combination thereof,
• M′ is Si, Ti, Al, Hf, Sn, Zr, Ga, or Ge,
• Rd is hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C30 alkenyl group, or a substituted or unsubstituted C2 to C30 alkynyl group, having at least one double bond or triple bond, respectively, a substituted or unsubstituted C3 to C30 cycloalkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• k is an integer of 0 to 30, and
• * represents a linking point with the terminal end of the organic chromophore, or the side chain of the polymer, of the compatibilizer;
• coating the composition on a substrate;
• and
• heating the coating such that the precursor of the inorganic material polymer forms a polymer by a sol-gel reaction.