Fluorescence from conjugated polymer aggregates in dilute poor solution

被引:94
作者
Hsu, JH
Fann, WS
Tsao, PH
Chuang, KR
Chen, SA
机构
[1] Acad Sinica, Inst Atom & Mol Sci, Taipei, Taiwan
[2] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
[3] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu, Taiwan
关键词
D O I
10.1021/jp983921t
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We examine a PPV derivative, viz. poly(2,5-dioctyloxy p-phenylene vinylene) (DOO-PPV) in poor solution. The solubility of DOO-PPV in toluene solution exhibits dramatic variation when cooled below room temperature. The fluorescence exhibits a characteristic red-shift emission spectrum during the cooling process. This fluorescence spectrum and the accompanying red-shift absorption spectrum suggest that the polymer forms dimer-like aggregates in dilute poor solution. The reduction in solubility also introduces a quenching effect. In comparing the photophysics of the film and the solutions, we can see that the films are comprised of individual polymer and interchain aggregates, but the fluorescence exhibits only the behavior of aggregates. At low temperature, additional light-emitting species result in spectral dynamics over several nanoseconds in the films. This indicates multiple emission species in polymer films.
引用
收藏
页码:2375 / 2380
页数:6
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