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Photoluminesce (PL) spectroscopy offers excellent methods for mapping the PLdecay on the nanosecond time scale. However, capturing maps of emissiondynamics on the microsecond time scale can be highly time-consuming. We presenta new approach to fluorescence lifetime imaging FLIM, which combines theconcept of random temporal speckles excitation (RATS) with the concept of asingle-pixel camera based on spatial speckles. The spatio-temporal specklepattern makes it possible to map PL dynamics with unmatched simplicity.Moreover, the method can acquire all data necessary to map PL decays in themicrosecond timescale within minutes. We present proof of principlemeasurements for two samples and compare the reconstructed decays to thenon-imaging measurements. Finally, we discuss the effect of the preprocessingroutine and other factors on the reconstruction noise level. The presentedmethod is suitable for lifetime imaging processes in several samples, includingcharge carrier dynamics in perovskites or monitoring solid-state luminophoreswith a long lifetime of PL.

Fluorescence lifetime imaging via spatio-temporal speckle patterns in single-pixel camera configuration