Author:
Chan W. K.,Chun K. H.,Lai T. W.,Leung A. F.
Abstract
The fluorescence decay rate observed is associated mainly with the intramolecular relaxation of the excited uranyl ion despite the presence of impurities, defects, and self-absorption of fluorescence light in the crystal. Multiphonon transitions dominate the relaxation at temperatures higher than room temperature. The parameters of the multiphonon relaxation are extracted from the temperature dependence of fluorescence decay rate. The parameters show that at low temperatures the quantum efficiency of the fluorescent level is greater than 0.80 and that of the electronic level above the fluorescent level is less than 0.13. The absence of fluorescence from the electronic level above the fluorescent level is due to fast depopulation by non-radiative processes and low quantum efficiency.
Publisher
Canadian Science Publishing
Subject
General Physics and Astronomy
Cited by
3 articles.
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