Journal
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume 12, Issue 6, Pages 996-1007Publisher
SPRINGERNATURE
DOI: 10.1039/c3pp25410k
Keywords
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Funding
- Science Foundation Ireland [SFI P.I. 09/IN.1/B2650]
- Chinese Academy of Sciences
- National Natural Science Foundation of China (NSFC) [61178007]
- Science and Technology Commission of Shanghai Municipality (STCSM) [11nm0502400, 12PJ1409400]
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The nonlinear absorption properties of two series of novel free base and metalated meso 5,10-A(2)B(2) substituted porphyrins, both bearing p-tolyl as an A substituent and TMS-ethynyl or bromine as a B substituent, were investigated with the open Z-scan technique at 532 nm in the ns time regime. Most of the compounds exhibited a transmission drop with increasing input fluence. This behavior is desirable for their applications in optical limiting. More complex responses: a drop in transmission followed by an increase in transmission or an increase in transmission followed by a transmission drop, with increasing input fluence, were detected for certain compounds. All of the recorded responses were successfully fitted with a four-level model with simultaneous two-photon absorption arising from the higher excited states (consecutive one- + one- + two-photon absorption). The TMS-ethynyl group was found to be a more efficient meso substituent in optical limiting than the bromine atom. Indium, lead and zinc complexes with TMS-ethynyl substituents were the strongest positive nonlinear absorbers amongst compounds studied which makes them the most interesting candidates for optical limiting application.
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