Typical decay shapes in experiments with varied water / acetonitrile ratio and with varied BODIPY-C18 concentrations are presented in Figure . Time-resolved emission scan (TRES) of a concentrated BODIPY-C18 in a midpoint (50 Vol.% water / acetonitrile mixture, Figure ) yielded two main regions of interest, accordingly being 530-560 nm (main peak) and 600-615 nm (exciplex peak). Exciplex peak appears approximately 500 ps after excitation pulse and decays faster than the main band. Two peaks thus should be considered a distinct fluorophore ensembles. TRES profiles were similar for all of the systems in binary solvent mixtures. Monomer decay yields good regression in a monoexponential model at low water content. Higher water content samples, however, require second component for reconvolution fit, and decays also bear ultrafast component with pronounced anisotropy. This last component does not allow for proper resolution of exponentials, so it was omitted in biexponential analysis.