  The nonlinear optical (NLO) properties of 1-(4-Methyl)-
piperazinylfullerene[60] (MPF) incorporated with a polysiloxane copolymer
denoted as PSI-46 have been studied using nanosecond laser pulses at 532-nm
wavelength. The optical limiting performance of MPF itself is poorer than that
of its parent C60, while the contribution of PSI-46 attached to the MPF shows
marginally improvement from the ratio of MPF/PSI-46(1:2) to MPF/PSI-46(1:6).
However, the effect can be neglected to the MPF optical limiting responses. The
photoluminescence emission of MPF-containing polymers was slightly improved in
comparison with that of MPF. The possible sources for the slightly improvement
in the NLO behaviour are discussed.
