Nonlinear Optical Chromophores with New Donors that Increase Refractive Index

A nonlinear optical chromophore of a general formula (I):

• wherein D represents an organic electron-donating group;
• A represents an organic electron-accepting group having an electron affinity greater than the electron affinity of D;
• and Π represents a Π-bridge between the organic electron-accepting group and the organic electron-donating group;
• wherein D comprises a following formula (D2):
• wherein X1, X3, and X5 are each independently a substituted or unsubstituted nitrogen or carbon;
• wherein X2, X4, and X6 are each independently a substituted or unsubstituted phosphorus or carbon;
• wherein R1 is a substituted or unsubstituted aryl, a substituted or unsubstituted alkyl, or a substituted or unsubstituted ring-locked heteroatom;
• and wherein R2 is a hydrogen or forms a five-membered ring or a six-membered ring with R1.

An electro-optic device comprising one or more resistive film, wherein the one or more resistive film each comprising a nonlinear optical chromophore dispersed and poled within a host polymer matrix, wherein the nonlinear optical chromophore of a general formula (I):

• wherein D represents an organic electron-donating group;
• A represents an organic electron-accepting group having an electron affinity greater than the electron affinity of D;
• and Π represents a Π-bridge between the organic electron-accepting group and the organic electron-donating group;
• wherein D comprises a following formula (D1):
• wherein R1, R2, R3, R4 and R5 are each independently a substituted or unsubstituted aryl, a substituted or unsubstituted alkyl, a substituted or unsubstituted ring-locked heteroatom, a S, Se or Te substituent or a hydrogen;
• wherein R6 is a substituted or unsubstituted aryl, a substituted or unsubstituted alkyl, or a substituted or unsubstituted ring-locked heteroatom;
• and wherein R15 is a hydrogen or forms a five-membered ring or a six-membered ring with R6.