Consequently, the radiative and non-radiative rate constants were determined (n: kf = Φf / τs, knr = (1 -Φf) / τs) and are consistent with the fluorescence profile of the AL(DIPY)3 complexes. The radiative rate (fluorescence) and non-radiative decay rates (IC, ISC, ICT) are of the order of 10 6 s -1 and 10 8 s -1 , respectively, supporting the prevalence of the non-radiative decays (Table ). Similar values have been reported of dipyrrin complexes showing that increasing the number of dipyrrin moieties in proximity influences the emissive properties and enhances the triplet state or internal conversion processes to the ground state. Lastly, the singlet excited energy state was determined experimentally via the intersection of the normalized absorption and emission spectra and was found to be in the range of 2.3 -2.4 eV (Table ).