Chemical optical sensing based on luminescence lifetime measurements: A caveat
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Optical sensors based on the luminescence lifetime quenching are often considered as being more attractive than luminescence intensity-based sensors. However, depending on the nature of the luminophore-matrix system considered, the relative positions of the I0/I and τ0/τ curves as a function of the quencher concentration can vary considerably. With a view to rationalize these observations, numerical computations of the I0/I and τ0/τ ratios have been performed in a two-site model. It is shown that this simple model can explain the various observations and that lifetime measurements performed by phase fluorometry are sometimes not suitable for analytical application.
CitationHendrick, F.; Donckt, E.V. (1999). Chemical optical sensing based on luminescence lifetime measurements: A caveat. , Sensors and Actuators, B: Chemical, Vol. 61, Issue 1, 218-221, DOI: 10.1016/S0925-4005(99)00263-4.