文献类型：期刊文献

英文题名：Random conjugated polybenzazole copolymers: Synthesis, characterization, and exciton confinement effects in photophysical properties

作者：Wang, Shanfeng[1,2]; Wu, Pingping[1]; Han, Zhewen[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2004

卷号：39

期号：8

起止页码：2717

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：2004208160288);WOS:【SCI-EXPANDED(收录号:WOS:000220412400008)】；

语种：英文

外文关键词：Excitons - Fourier transform infrared spectroscopy - Heat treatment - Light emitting diodes - Microstructure - Organic acids - Photoluminescence - Probability distributions - Thermodynamic stability - Thin film transistors - X ray diffraction analysis

摘要：New conjugated random copolymers of poly( p-phenylene benzobisoxazole) (PBO) and poly( 2,5-benzoxazole) (ABPBO) with various compositions have been synthesized and characterized by Fourier transform infrared (FTIR), wide-angle X-ray diffraction (WAXD), UV-absorption, and photoluminescence spectra. The side-to-side distance between two neighboring PBO-ABPBO chains can be modulated by the composition ratio. The absorption, excitation, and emission peaks for the copolymers in methanesulfonic acid can also be regulated by the copolymer composition from the homopolymer ABPBO solution to homopolymer PBO solution. However, the emission peaks of copolymers in solid state are quite different from those of their homopolymers. The copolymers showed blue shifted, structured emission spectra centered with higher quantum efficiency at 470 nm compared with the parent homopolymer PBO, indicating the effects of exciton confinement in the random copolymers. The relationship between the structure and properties for the random copolymers can be interpreted roughly by the sequence length distribution of the different segments estimated from the copolymerization statistics. (C) 2004 Kluwer Academic Publishers.