Penzkofer, Alfons and Simmel, M. and Riedl, D. (2012) Room temperature phosphorescence lifetime and quantum yield of erythrosine B and rose bengal in aerobic alkaline aqueous solution. JOURNAL OF LUMINESCENCE, 132 (4). pp. 1055-1062. ISSN 0022-2313,
Full text not available from this repository. (Request a copy)Abstract
The room-temperature phosphorescence behavior of erythrosine B (ER) and rose bengal (RB) in aerobic aqueous solution at pH 10 (10(-4) M NaOH) is investigated. The samples were excited with sliced second harmonic pulses of a Q-switched Nd:glass laser. A gated photomultiplier tube was used for instantaneous fluorescence signal discrimination and a digital oscilloscope was used for signal recording. For phosphorescence lifetime measurement the oscilloscope response time was adjusted to appropriate time resolution and sensitivity by the ohmic input resistance. In the case of phosphorescence quantum yield determination the gated photomultiplier - oscilloscope arrangement was operated in integration mode using 10 M Omega input resistance. Phosphorescence quantum yield calibration was achieved with erythrosine B and rose bengal doped starch films of known quantum yields. The determined phosphorescence lifetimes (quantum yields) of ER and RB in 0.1 mM NaOH are tau(p)=1.92 +/- 0.1 mu s (phi(p)=(1.5 +/- 0.3) x 10(-5)) and 2.40 +/- 0.1 mu s ((5.7 +/- 0.9) x 10(-5)), respectively. The results are discussed in terms of triplet state deactivation by dissolved molecular oxygen. (C) 2011 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOTOMULTIPLIER GATING CIRCUIT; SINGLET MOLECULAR-OXYGEN; SILICA-GEL GLASSES; DELAYED FLUORESCENCE; LUMINESCENCE MEASUREMENTS; XANTHENE DYES; TRIPLET-STATE; DERIVATIVES; ABSORPTION; SPECTROSCOPY; Erythrosine B; Rose bengal; Aerobe phosphorescence behavior; Phosphorescence lifetime; Phosphorescence quantum yield; Oxygen phosphorescence quenching |
| 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: | 18 May 2020 08:33 |
| Last Modified: | 18 May 2020 08:33 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19031 |
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