Synthesis, chain rigidity, and luminescent properties of poly[(1,3-phenyleneethynylene)-alt-tris(2,5-dialkoxy-1,4-phenyleneethynylene)]s

被引:40
作者
Chu, QH
Pang, Y [1 ]
Ding, LM
Karasz, FE
机构
[1] Clark Atlanta Univ, Dept Chem, Atlanta, GA 30314 USA
[2] Clark Atlanta Univ, Ctr High Performance Polymers & Composites, Atlanta, GA 30314 USA
[3] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
关键词
D O I
10.1021/ma020893a
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Soluble poly[(1,3-phenyleneethynylene)-alt-tris(2,5-dialkoxy-1,4-phenyleneethynylene)] derivatives (5) have been synthesized by using the Heck-type coupling reaction. Even with a significant increase in the p-phenyleneethynylene content, the copolymers exhibit a random-coil conformation in THF solution, with a Mark-Houwink exponent determined to be a approximate to 0.78. As a result of the extended conjugation length of the chromophore, the absorption and emission lambda(max) values of 5 are notably red-shifted (by about 30-40 nm) from that of poly[(1,3-phenyleneethynylene)-alt-(2,5-dialkoxy-1,4-phenyleneethynylene)] derivatives (2). The fluorescence quantum efficiency of 5 is estimated to be phi(fl) approximate to 0.50, slightly higher than that of 2 (phi(fl) approximate to 0.44). The fluorescence of 5 in the solid state is strong, indicating its potential for various device applications. LEDs based on 5 emitted green-yellow EL with an external quantum efficiency of 0.013%.
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页码:7569 / 7574
页数:6
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