Abstract
We designed and synthesized a push-pull type chromophore (PT-TCF) containing phenylene and thiophene ring as a conjugation bridge. Bulky alkyl chain was substituted into the phenylene bridge to minimize the intermolecular interaction among the neighbor molecules and to enhance solubility of the chromophore in solvents and a polymer host. 1H NMR and 1H-1H COSY spectroscopy confirmed that the chromophore was in all trans-ethenyl conformation. The chromophore exhibited fairly high melting point of 188°C. The chromophore was thermally stable up to 220°C in the nitrogen atmosphere. The relatively high melting point and decomposition on-set may be attributable to the rigid bridge component. The chromophore was blended with an optically transparent polymer host to make a thin film and then its macroscopic optical nonlinearities were evaluated. In a preliminary result, the polymer films containing PT-TCF as a concentration of 50 wt% exhibited electro-optic coefficient as large as 22 pm/V taken at 1.55 μm.
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