Typical, radiative rate kr = PLQY/lifetime. Here, lifetime is measured using tcspc ie variation of PL intensity (film or solution) versus time (say nanosec). In case of monoexponential decay, kr can be estimated if PLQY and lifetime is known. How can one calculate kr if the tcspc is multiexponential? Would such kr have any relevance at all?
If multiexponential decay, it means several emitting states (species). Therefore, generally speaking, radiative/nonradiative separation is meaningful for monoexponential decay kinetics.
For a multi-exponential emission decay pattern, the radiative rate constant is given as, kr = QY/τav, where τav represents the average lifetime.Similar is the case for the non-radiative decay rate.
However, a radiative rate constant is only meaningful in case of multi-exponential emission decay if a qualitative idea of the rotational relaxation (i.e. association/dissociation and/or complex formation) time is required, no quantitative conclusions should be drawn from here.
Thank you Prof. Gurzadyan and Dr. Ganguly for your response!
But isn't rotational relaxation very fast (in ps)? and mostly contribute to non-radiative? The time scale I am interested in is in ns.
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