In order to minimize the intermolecular electrostatic interactions and effectively translate high μβ value of chromophore into macroscopic electro-optical (EO) coef?cient (r₃₃), the shape-modification of aniline-pyrroline chromophore by combining three kinds of dendritic groups respectively to the N atom of pyrroline acceptor produced three kinds of dendritic chromophores. Their physical, optical properties and EO activity influenced by different dendritic groups were discussed. The result indicates that shape-modification of the aniline-pyrroline chromophore with dendritic groups made a red-shift of UV-Vis absorption, and the produced dendritic chromophore had a better compatibility with amorphous polycarbonate polymer (APC). Their spherical structures can minimize intermolecular electrostatic interactions, and thus the orientational order parameter (Φ) was as high as 44% when chromophores as a guest in the host polymer APC. A large electro-optical (EO) coefficient was achieved as high as 75 pm/V at 1315 nm with 9% chromophores loading in APC film.

Key words: electro-optic material, chromophores, dendritic group, amorphous polycarbonate polymer