Abstract
Effects of two types of chemical modifications on photoconducting polymers consisting of polyphenylene vinylene (PPV) derivatives are studied by static and ultrafast transient optical spectroscopy as well as semi-empirical ZINDO calculations. The first type of modification inserts 2,2′-bipyridyl-5-vinylene (bpyV) units in the PPV backbone, and the second type involves metal-chelation with the bpy sites. Photoluminescence (PL) and exciton dynamics of polymers 1 and 2 with PV:bpyV ratios of 1 and 3 were examined in solution, and compared with those of the homo-polymer, poly(2,5-bis(2′-ethylhexyloxy)-1,4-phenylene vinylene) (BEH-PPV). Similar studies were carried out for several metal-chelated polymers. These results can be explained by changes in π-conjugation throughout the polymer backbone. The attenuation in π-conjugation by the chemical modifications transforms a conducting polymer from one-dimensional semiconductor to molecular aggregates.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 229-234 |
| Number of pages | 6 |
| Journal | Synthetic Metals |
| Volume | 116 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - Jan 1 2001 |
Funding
This study was supported by the Environmental Management Science Program and by the Division of Chemical Sciences, Office of Basic Energy Sciences, US Department of Energy under contract W-31-109-Eng-38. The authors would like to thank Professors Frank Spano, Lewis Rothberg, and Russell H. Schmehl for their helpful discussions and Dr. Eric S. Manas for his help in ZINDO calculations.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry