of luminescence
The time required for the @L03641@ intensity to decay from some initial value to \(\frac{1}{\text{e}}\) of that value (\(\text{e} = 2.718\,...\)). Lifetimes can be measured by @P04529@ (@F02416@) where the phase shift between the sinusoidally modulated exciting light and the emitted light is measured.
PAC, 1984, 56, 231. (Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy) on page 242 [Terms] [Paper]