Effect of cis-backbone on optical properties of polyphenylacetylene
By controlling the temperature of chemical reaction, we synthesized four polyphenylacetylene samples, in which the percentages of cis configurations were determined to be 65, 75, 85 and 100％, respectively. Ultravioletvisible and fluorescence studies show that the cis-configured backbones have posed significant effects on the optical absorption and fluorescence of the polyphenylacetylenes. Upon the 325-nm excitation, the dilute solutions of these cis-polyphenylacetylenes give offweak fluorescence with their peak located at about 390 nm, but the concentrated solutions of the polymer can give off strong orange-red fluorescence with their peak located at about 600 nm. With Hückel tight binding theory, both the E-k dispersion relations and the density of states were calculated for cis-polyphenylacetylene. Our results suggest that the blue photoluminescence of polyacetylenes origins from the backbone enhanced π-conjugation of the phenyi chromophors in the polymer, and that intermolecular interactions can occur in the excited complex of the polymer.
Polyphenylacetylene Absorption Photoluminescence Electronic structure
Bao-Gai Zhai Yuan Ming Huang
College of Physics & Electronic Information, Yunnan Normal University, Yunnan 650092, China
国际会议
2009 International Symposium on Liquid Crystal Science and Technology(2009国际液晶科技研讨会)
昆明
英文
483-486
2009-08-02（万方平台首次上网日期，不代表论文的发表时间）