Tyagi, A. and del Agua, D. and Penzkofer, Alfons and Garcia, O. and Sastre, R. and Costela, A. and Garcia-Moreno, I. (2007) Photophysical characterization of pyrromethene 597 laser dye in cross-linked silicon-containing organic copolymers. CHEMICAL PHYSICS, 342 (1-3). pp. 201-214. ISSN 0301-0104,
Full text not available from this repository. (Request a copy)Abstract
Samples of the dipyrromethene-BF2 dye PM597 incorporated in copolymers of 3-trimethoxysilylpropyl 2-methylprop-2-enoate (TMSPMA, number of polymerizable CC double bonds: K = 1) with 2-(2-methylprop-2-enoyloxy)ethyl 2-methylprop-2-enoate (EGDMA, K = 2), [2-(hydroxymethyl)-3-prop-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate (PETA, K = 3), and [3-prop-2-enoyloxy-2,2-bis(prop-2-2-enoyloxymethyl)propyl]prop-2-enoate (PETRA, K = 4) are characterized. The fluorescence quantum distributions, fluorescence quantum yields, degrees of fluorescence polarization, and fluorescence lifetimes are measured. The radiative lifetimes are calculated from fluorescence lifetime and quantum yield. Absorption coefficient spectra are determined from transmission measurements. Absolute absorption cross-section spectra and dye concentrations are obtained by calibration to the radiative lifetimes and to saturable absorptions. Excited-state absorption cross-sections at 527 nm are determined by saturable absorption measurements. The photo-degradation is studied under cw laser excitation conditions and quantum yields of photo-degradation are extracted. The excited-state absorption cross-sections were found to be rather small, and the photo-stability turned out to be high (up to 3 million excitation cycles before degradation) making this class of dipyrromethene dye-doped polymers attractive active laser media. Structural and thermo-mechanical properties of the materials have been determined by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetry, densitometry, and refractometry. They improve with increasing inter-crossing (copolymerization of TMSPMA with PETA and PETRA). The laser properties of the PM597 doped copolymers were evaluated by transverse pumping with 6 ns laser pulses at 532 nm. The best laser materials resulted to be the 7:3 and 9:1 TMSPMA-monomer copolymers. (C) 2007 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | INORGANIC HYBRID MATERIALS; RHODAMINE 6G; PHYSICAL-PROPERTIES; HIGHLY EFFICIENT; STATE; MATRICES; EMISSION; HOSTS; PHOTOSTABILITY; METHACRYLATE); pyrromethene dye PM597; solid-state laser dye characterization; polymer matrices; ground-state absorption cross-sections; stimulated emission cross-sections; excited-state absorption cross-sections; fluorescence quantum distributions; fluorescence quantum yields; fluorescence lifetimes; degrees of photo-degradation; optical dye concentration determination |
| 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: | 25 Nov 2020 07:37 |
| Last Modified: | 25 Nov 2020 07:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/31811 |
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