Abstract
Optical absorption and emission properties of a monosubstituted polyacetylene poly[(4-hexylcarbonyl-biphenyl-4′-oxy)-1-propyne] have been investigated by means of ultraviolet-visible spectrophotometry, fluorescence spectroscopy, and electronic structure calculations, respectively. Under ultraviolet excitations, dilute tetrahydrofuran solutions of the side-chain polymer can give off deep-blue photoluminescence. Our results have demonstrated that the optical properties of the liquid crystalline polymer are both concentration and temperature dependent. The origin of the deep-blue photoluminescence of polymer can be ascribed to the biphenyl chromophors in its pendants. Comparative studies to a biphenyl-containing liquid crystal give further evidence to our discussion on the origin of the deep-blue photoluminescence of the polymer.
Acknowledgments
Financial supports from the Natural Science Foundation of China (No. 10674091), the Scientific Research Fund for Returned Overseas Chinese Scholar from Education Ministry of China (No. 2005-546), and the Key Research Project of the Education Ministry of China (No. 206110) are gratefully acknowledged.