Laser induced singlet-oxygen-sensitised delayed fluorescence of dyes in aqueous solutions
| Autor: | Olga A. Yuzhakova, Evgenii A Luk'yanets, N N Drozdova, A. A. Krasnovskii, M.E. Bashtanov |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
inorganic chemicals
education.field_of_study Singlet oxygen Population chemistry.chemical_element Statistical and Nonlinear Physics Photochemistry Oxygen Fluorescence Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Excited state Phthalocyanine Singlet state Electrical and Electronic Engineering education Phosphorescence |
| Zdroj: | Quantum Electronics. 32:83-86 |
| ISSN: | 1468-4799 1063-7818 |
| DOI: | 10.1070/qe2002v032n01abeh002132 |
| Popis: | It is shown that water-soluble derivatives of phthalocyanines — poly(diethoxyphosphinylmethyl)substituted aluminium phthalocyanines — emit intense singlet-oxygen-sensitised delayed fluorescence upon laser-induced formation of singlet oxygen in air-saturated aqueous (D2O) solutions. The delayed fluorescence is emitted by the dye molecules which accepted energy from two molecules of singlet oxygen. The quantum efficiency of delayed fluorescence in aerated D2O of the chloroaluminium complex of octa(diethoxyphosphinylmethyl) phthalocyanine corresponds to the rate constant of population of excited dye molecules which is equal to (5.5 ± 3) × 1012 mole-2 L2 s-1. This value is only an order of magnitude smaller than that for tetra(4-tert.-butyl)phthalocyanine earlier studied in aerated organic solvents. It is shown that these phthalocyanine derivatives can be used as highly sensitive luminescence indicators of singlet oxygen produced in aqueous solutions of different compounds upon laser excitation. |
| Databáze: | OpenAIRE |
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