Enhanced poling efficiency in highly thermal and photostable nonlinear optical chromophores
Faccini, Mirko × Balakrishnan, Muralidharan Diemeer, Mart B. J Hu, Zhi-Peng Clays, Koen Asselberghs, Inge Leinse, Arne Driessen, Alfred Reinhoudt, David N Verboom, Willem #
Royal Society of Chemistry
Journal of Materials Chemistry vol:18 issue:18 pages:2141-2149
A series of nonlinear optical chromophores based on the highly thermal and photostable tricyanovinylidenediphenylaminobenzene ( TCVDPA) was synthesized and their thermal and optical properties were investigated. Modification of the TCVDPA chromophore with bulky groups provides reduction of dipole-dipole interactions and thus great improvement of the macroscopic electro-optic (EO) response of the polymeric materials obtained by incorporating these derivatives as a guest at high loading in polysulfone. The best result was obtained with chromophore C5, bearing fluorinated aromatic substituents, which shows a doubling of the EO activity at 30 wt% ( 25 pm V-1 at 830 nm) compared with the pristine TCVDPA. The bulkier the chromophore, the lower the induced plasticization effect (as much as 50 degrees C difference on the T-g attenuation). Furthermore, all chromophores in this study possess good processability and exhibit high thermal decomposition temperatures (highest T-d = 360 degrees C).