Penzkofer, A. and Tyagi, A. and Slyusareva, E. and Sizykh, A. (2010) Phosphorescence and delayed fluorescence properties of fluorone dyes in bio-related films. CHEMICAL PHYSICS, 378 (1-3). pp. 58-65. ISSN 0301-0104,
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The phosphorescence and delayed fluorescence behaviour of the fluorone dyes disodium fluorescein (FL, uranine), 4,5-dibromofluorescein (DBF), eosin Y (EO), erythrosine B (ER), and rose bengal (RB) in bio-films of gelatine, starch, and chitosan at room temperature is studied. Phosphorescence and delayed fluorescence quantum yields and lifetimes were measured. The singlet-triplet dynamics is described and applied to the fluorone dyes for parameter extraction. For uranine films at room temperature no phosphorescence could be resolved. The efficiency of singlet-triplet intersystem crossing increased in the order phi(ISC)(DBF) < phi(ISC)(EO) < phi(ISC)(ER) < phi(ISC)(RB) due to the heavy atom effect on spin-orbit coupling. The phosphorescence quantum yields increased in the order phi(P)(DBF) < phi(P)(EO) < phi(P)(RB) < phi(P)(ER). The phosphorescence lifetimes followed the order tau(P)(DBF) > tau(P)(EO) > tau(P)(ER) > tau(P)(RB). (C) 2010 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EMISSION SPECTROSCOPIC CHARACTERIZATION; BORIC-ACID GLASS; ROSE-BENGAL; THIN-FILMS; ABSORPTION; LASER; ERYTHROSIN; EOSIN; POLYMER; TEMPERATURE; Fluorescein; Dibromofluorescein; Eosin Y; Erythrosine B; Rose bengal; Bio-films; Phosphorescence; Delayed fluorescence |
| 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: | 06 Jul 2020 06:53 |
| Last Modified: | 06 Jul 2020 06:53 |
| URI: | https://pred.uni-regensburg.de/id/eprint/23744 |
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