Handbook Of Biological Confocal Microscopy pp 516-534
Fluorescence Lifetime Imaging in Scanning Microscopy
It was not until the 1930s that measurement of the fluorescence lifetime (τf ) and the confirmation of theory on this phenomenon became possible (Pringsheim, 1961). Before that time only phosphorescence lifetimes had been measured, evidently because this phenomenon is one or more orders of magnitude slower.
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