Abstract
Abstract The two-photon absorption (TPA) and TPA-induced frequency upconversion emission properties of the dyes 4-[P-(dicyanoethylamino) crystal]- N -methypyrdinium iodide and the complex of 4-[P-(dicyanoethylamino) crystal]- N -methypyrdinium iodide and Ce(NO 3 ) 3 were experimentally studied. It was found that the TPA cross section for the dye sensitized by Ce 3+ is two factors larger than that of the dye without being sensitized. A three-level system model of the dye molecules was used to analyze the enhancement of TPA by the sensitizer Ce 3+ , which indicated that the sensitizer results in the increase of the transition dipole moment from the one-photon allowed excited state(1 Bu ) to the two-photon allowed excited state(2 Ag ).
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