A nunchaku-like nonlinear optical chromophore for improved temporal stability of guest-host electro-optic materials

摘要

A novel nunchaku-like organic second order nonlinear optical chromophore containing a D-π-A backbone and a rigid biphenylene unit was prepared. The UV-vis absorption spectra studies demonstrated that the large rigid structure could suppress dipole-dipole interactions effectively. The electro-optic coefficient of a poled film containing 20% wt of the new dye doped in amorphous polycarbonate afforded a value of 39 pm/V at 1310 nm. Compared with results obtained from a similar D-π-A chromophore without the rigid isolated group, the new dye gave better performance. Moreover, the electro-optic film prepared with the new dye gave greater temporal stability, compared to a similar D-π-A doped poled film that was reported previously. These results indicated that the introduction of a biphenylene group could effectively reduce the intermolecular electrostatic interactions and aid the alignment of the chromophores.