An overview of continuous and discrete phasor analysis of binned or time-gated periodic decays

TL;DR

This paper revisits the phasor method for analyzing periodic luminescence decays with time-gating, deriving analytical expressions for discrete configurations, and discussing effects like IRF offset and gate shape on the analysis.

Contribution

It provides new analytical expressions for discrete phasor configurations and discusses modifications to calibration and lifetime calculations in gated decay analysis.

Findings

Derived analytical expressions for square gate configurations.

Compared phasor loci to the universal semicircle.

Discussed effects of IRF offset, decay truncation, and gate shape.

Abstract

Time-resolved analysis of periodically excited luminescence decays by the phasor method in the presence of time-gating or binning is revisited. Analytical expressions for discrete configurations of square gates are derived and the locus of the phasors of such modified periodic single-exponential decays is compared to the canonical universal semicircle. The effects of IRF offset, decay truncation and gate shape are also discussed. Finally, modified expressions for the phase and modulus lifetimes are provided for some simple cases. A discussion of a modified phasor calibration approach is presented.