Search

Ultrafast dynamics of the excited state of 2,9,16,23-phenoxy-phthalocyanine (Pc1) and 2,9,16,23-phenoxy-phthalocyanine-zinc (Pc2) has been investigated using femtosecond transient absorption (TA) and time-resolved fluorescence (TRFL) techniques. The observed dynamics of femtosecond TA and TRFL experiments are similar, which demonstrated the intrinsic properties of the excitation and the relaxation processes in both kinds of phthalocyanines with two decay components. A multi level model has been proposed to explain the photophysical processes after Soret-band excitation. The results show that the fast decay component dynamics comes from the intramolecular vibrational relaxation, the slower ones from the internal conversion. The samples are expected to be a potential candidate for optical applications and photodynamic therapy. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]