Concentration Quenching and Depolarisation of Photoluminescence in Solutions
Open Access
- 1 December 1972
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 27 (12) , 1751-1755
- https://doi.org/10.1515/zna-1972-1208
Abstract
The emission anisotropy r/r0 and quantum yield η/η0 of the photoluminescence of glycerin-water solutions of Na-fluorescein has been measured at concentrations 10-6 - 3·10-1 M. The drop of η/η0 is connected with a repolarisation effect, which is interpreted by a completed theory of con-centrational depolarisation of photoluminescence (CDPL), accounting the self-quenching by non-luminescent dimers and the remigration of excitation energy. The dimerisation constant and the critical concentrations have been determined.Keywords
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