Abstract

We report here the nonlinear absorption of bifluorene derivatives induced by two-photon absorption (TPA), in order to study the effect of the dimension of the molecule on these properties. Measurements were performed in chloroform between 450 and 650 nm for nanosecond time duration pulses. The nonlinear absorption is attributed to a three-photon absorption process involving a first TPA step followed by an excited state absorption process. The 2D first generation organic dendrimer presents the highest values of the corresponding three-photon absorption coefficient α3, while the 3D systems presents lower efficiencies close to that of the bifluorene itself.

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