Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 124, Issue 9, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.2178790
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Exceptionally large two-photon absorption cross sections at the infrared region have been revealed by time-dependent density functional theory calculations for asymmetric charge-transfer conjugated zinc-porphyrin derivatives. The largest two-photon cross section is found to be more than one order of magnitude larger than for the conventional two-photon active organic molecules. The calculations show that the formation of strong charge-transfer states depends on the length of the conjugation bridge between the zinc-porphyrin core and the electron donor/acceptor. The two-photon absorption cross section can be greatly enhanced by increasing the strengths of the electron donor/acceptor. (c) 2006 American Institute of Physics.
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