External heavy atom effect on optical limiting performance of conjugated phthalocyanine pentamer

  • Liu C
  • Wang X
  • Gong Q
 et al. 
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A novel conjugated phthalocyanine pentamer was studied for optical limiting performance. Its fluence-dependent transmittance in different solvents was measured using 10 ns, 532 nm laser pulses in a collimated optical setup. Compared with in chloroform, phthalocyanine pentamer dissolved in chloroform/methyl iodide mixed solvent shows better optical limiting performance at the same linear transmittance. Explanation based on the triple-state absorption enhanced by the increase of the intersystem crossing rate through external heavy atom effect was proposed. © 2001 Elsevier Science B.V.

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