Bansal, A. K. and Holzer, W. and Penzkofer, A. and Hoerhold, H.-H. and Klemm, E. and Frank, W. and Kley, E. B. (2008) Spectroscopic and lasing characterisation of a luminescent phenylene/bipyridine polymer. SYNTHETIC METALS, 158 (19-20). pp. 758-766. ISSN 0379-6779,
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The luminescent polymer, poly[2,2'-bipyridine-5,5'-diyl-(2,5-dihexyl-1,4-phenylene)] (abbreviated PPBpy) dissolved in tetrachloroethane (TCE) and as neat film is characterised by optical absorption and emission spectroscopy. The absorption and stimulated emission cross-section spectra, the fluorescence quantum distributions, fluorescence quantum yields, degrees of fluorescence polarisation, and fluorescence lifetimes are determined. A lasing characterisation is carried out by pumping with single second harmonic pulses of a mode-locked ruby laser (wavelength 347.15 nm, duration 35 ps). The excited-state absorption at the pump-laser wavelength is determined by saturable absorption measurements. Laser oscillation of the polymer in TCE in an uncoated rectangular cell was achieved by transverse pumping using the cell windows for light feedback. From the laser threshold pump pulse energy density the effective stimulated emission cross-section at the lasing wavelength is extracted. The travelling-wave lasing behaviour of the polymer as neat him is studied by analysis of the amplification of the transverse pumped spontaneous emission. Surface emitting distributed-feedback lasing was achieved with a neat film on corrugated second-order periodic gratings. (C) 2008 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NEAT FILMS; THIN-FILMS; MEH-PPV; FLUORESCENCE BEHAVIOR; SATURABLE ABSORBERS; ABSORPTION; LASER; EMISSION; AMPLIFICATION; MOLECULES; Phenylene/bipyridine luminescent polymer; Absorption and fluorescence spectroscopy; Amplified spontaneous emission; Low-Q laser oscillation; Travelling-wave lasing; Distributed-feedback lasing |
| 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: | 21 Oct 2020 09:20 |
| Last Modified: | 21 Oct 2020 09:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30148 |
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