The respective AL(DIPY)3 complexes were dissolved in toluene or THF and their absorbance in the UV-Vis spectrum was adjusted to ca. 0.10 at the wavelength of excitation. TCSPC was performed and the spectra were obtained upon excitation at 450 nm for all AL(DIPY)3 complexes. The detection wavelength was set to 580 nm. Fluorescence lifetimes for all the compounds were calculated at picosecond scale.