Add time:09/05/2019         Source:sciencedirect.com

The optical power limiting performances for eight-β-octa-octyloxy phthalocyanines with initial linear transmission T0=88–92% at 532 nm in a 0.5 cm spectroscopic cell in toluene have been measured with 35 ps pulses, in which eight-β-octa-octyloxy phthalocyanine free-base exhibits the strongest optical limiting ability through a reverse saturable absorption from S1→Sn excited singlet states with σS1=4.0×10−17 cm2. The optical limiting thresholds are 50, 130 and 140 mJ/cm2 at T/T0=0.5 for eight-β-octa-octyloxy phthalocyanine free base, nickel phthalocyanine, and lead phthalocyanine respectively. The throughput of eight-β-octa-octyloxy phthalocyanine free base is clamped down to 70 mJ/cm2 with the limiting nonlinear transmittance Tlim=0.18 as the incident fluence reaching to 400 mJ/cm2. The aggregation behaviors for eight-β-octa-octyloxy phthalocyanines have been studied, in which the aggregation equilibrium constant k=5.6×103 in toluene for eight-β-octa-octyloxy phthalocyanine free base is larger than in mixed solvent containing acetonitrile (k′=1.4×103). This means that the eight-β-octa-octyloxy phthalocyanines aggregate more easily in nonpolar solvent than in polar solvent through the π–π interaction.

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