Optical limiting properties of peripherally modified palladium phthalocyanines doped silica gel glass

We report here the study of different peripherally modified palladium phthalocyanine (PdPc) encapsulated in silica gel glass obtained by sol–gel technique. The resulted composites were transparent and homogeneous with required optical limiting properties. Trapping effect was checked by UV/Vis absorption spectra and pore structure of the composites. Optical limiting properties were measured at 532 nm with 8 ns pulses. The results show that all the PdPcs have better optical limiting effect in composite than in solution, among which, PdPc-C has the best optical limiting effect due to its largest peripheral substituent.