Holzer, W. and Penzkofer, Alfons and Gong, S. H. and Bradley, D. D. C. and Long, X. and Blau, W. J. and Davey, A. P. (1998) Excitation intensity-dependent fluorescence behaviour of some luminescent polymers. POLYMER, 39 (16). pp. 3651-3656. ISSN 0032-3861, 1873-2291
Full text not available from this repository.Abstract
The fluorescence lifetime, fluorescence signal output and fluorescence spectral distribution of three highly diluted luminescent polymers (one para-phenylenevinylene and two para-phenylene-ethynylene polymers) in tetrahydrofuran are studied as a function of picosecond laser pulse excitation intensity. The results are compared with coumarin 2 in methanol and a distyrylbenzene molecule in tetrahydrofuran. The fluorescence lifetime and the spectral distribution are practically independent of excitation intensity, indicating the absence of excitation-dependent cooperative effects and the absence of emission from preferred exciton states. The fluorescence signal saturation of the polymer solutions at high excitation intensities indicates the photoexcitation of polymer segments (excitons or polarons) extending on average over two para-phenylene-ethynylene or four para-phenylenevinylene monomeric units. (C) 1998 Elsevier Science Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DYE SOLUTIONS; LASER-DYE; STATE; EMISSION; PULSES; conjugated polymers; fluorescence spectroscopy; saturation spectroscopy |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2023 11:11 |
| Last Modified: | 16 Feb 2023 11:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49716 |
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