“…Although fluorescence lifetime is a concentration-independent property of the excited state (it depends on structure, configuration and microenvironment), quantitative results can be obtained from fractional contributions of the components to the total intensity of the mixture. Phase-modulation fluorescence lifetime measurements have been used to resolve several analytical problems, including multicomponent analysis [1][2][3][4][5]. However, to the best of our knowledge, stereoisomers purity * Corresponding author.…”