Abstract
Experimental results of optical absorption spectra, photoluminescence spectra due to singlet exciton emission and photoinduced absorption spectra due to triplet-triplet transitions of triplet excitons for several oligomers of poly(p-phenylene vinylene) are reported. From the red-shift of the peaks with increasing chain length, the effective conjugation length for long-chain precursor-route samples of the polymer are estimated to be about 10 to 17 repeat units. Theoretical studies, using the valence-effective Hamiltonian (VEH) technique, of the effects of ring torsions upon the electronic properties are also reported. Comparison between absorption and luminescence spectra in solution and in the solid state shows a blue-shift for the solution spectra; this is modelled in terms of a greater degree of ring torsion for these oligomers in solution.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 13-28 |
| Number of pages | 16 |
| Journal | Synthetic Metals |
| Volume | 59 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jun 1993 |
| Externally published | Yes |
Bibliographical note
Funding Information:nologies for Europe/European Advanced Materials), Contract 0148, Project NAPOLEO (Nouvelles Applications de Polym~res h l'Electronique et ~ l'Op-tique). The work in Mons has been partly supported by the Belgian 'P61e d'Attraction Interuniversitaire: Chimie Supramol6culaire et Catalyse'. The work in Cambridge has been partly supported by the Science and Engineering Research Council and British Petroleum PLC.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry