Holzer, W. and Penzkofer, Alfons and Stockmann, R. and Meysel, H. and Liebegott, H. and Hoerhold, H. H. (2001) Energy density dependent fluorescence quenching of diphenyl substituted phenylene-vinylene and diphenylene-vinylene polymers by exciton-exciton annihilation. SYNTHETIC METALS, 125 (3). pp. 343-357. ISSN 0379-6779
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The energy density dependent fluorescence efficiency and fluorescence decay of neat films and solutions in 1,4-dioxane of poly[1,4-phenylene-1,2-di(4-phenoxyphenyl)vinylene] (DPOP-PPV), poly[1,4-phenylene-1,2-di(4-phenylthiophenyl)vinylene] (DPSP-PPV), poly[4,4'-diphenylene-1,2-di(4-phenoxyphenyl)vinylene] (DPOP-PDPV), and poly[4,4'-diphenylene-1,2-di(4-fluorophenyl)vinylene] (DFP-PDPV) are investigated with picosecond laser pulses. In low-concentration solutions, upon exciting more than one segment per polymer chain, the fluorescence efficiency reduces. In non-waveguiding thin neat films, the energy density dependent fluorescence signal reduction begins at much lower pulse energy density than in solution. The fluorescence behaviour is thought to be mainly due to exciton-exciton annihilation with time-dependent annihilation constant followed by polaron pair formation and subsequent polaron pair annihilation. (C) 2001 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CONJUGATED-POLYMER; STIMULATED-EMISSION; WAVE-GUIDES; DPOP-PPV; POLY(PHENYLENE VINYLENE); NONRESONANT N(2); CHARGE-CARRIERS; THIN-FILMS; LASER; ULTRAFAST; luminescent polymers; phenylenevinylene polymers; diphenylenevinylene polymers; neat films; fluorescence quenching; exciton-exciton annihilation; polaron pair formation; polaron pair annihilation |
| 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: | 23 Nov 2021 06:39 |
| Last Modified: | 23 Nov 2021 06:39 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40864 |
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