Novel metallo-phthalocyanine with high performances for ns optical limiting in solution

Abstract The optical limiting performances of metallo-phthalocyanines of (C12H25O)8PcNi and (C12H25O)8PcPb were investigated in toluene, in which the optical limiting threshold and clamped value of the (C12H25O)8PcPb were much lower than those of C60 at same conditions in toluene and the optical limiting threshold and clamped value of the (C12H25O)8PcNi were also comparable to the C60 for 8 ns pulses at 532 nm. The photophysical parameters were calculated according to a multiple levels model, which indicated that the reverse saturable absorption in the excited triplet state is responsible for the optical limiting mechanism for (C12H25O)8PcNi and (C12H25O)8PcPb with improved stability.