The fluorescence and dynamics properties in phenoxy-phthalocyanines liquid

• We investigated the one-photon fluorescence of phenoxy-phthalocyanines.
• We investigated the two-photon fluorescence of phenoxy-phthalocyanines.
• The results reveal that the fast decay component comes from the IVR.
• The results reveal that the slower ones from the IC.

We investigated the one/two-photon fluorescence and excited state dynamics properties of two synthesized phenoxy-phthalocyanines (Pc1 and Pc2) using mild reaction coordination method. The results show that the fast decay component in the time-resolved fluorescence technique dynamics comes from the intramolecular vibrational relaxation, the slower ones from the internal conversion. Furthermore, in comparison with one-photon fluorescence spectra, the red shift of two-photon fluorescence spectra can be explained by the reabsorption effect of molecules. The samples are expected to be a potential candidate for optical applications and photodynamic therapy.