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Surface plot of fD for a single lifetime donor system with two species. (A) fD surface plotted as a function of 〈τ〉/τD and τF/τD using Eq. 5. (B) mfD versus 〈τ〉/τD related to the minimization of fD as a function of τF/τD (τF = 〈τ〉/2) using Eq. 6. Note that the surface plotted in panel A presents an observable minimum, which corresponds to the curve plotted in panel B.
