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J Phys Chem A. 2007 May 24;111(20):4188-94. Epub 2007 May 3.

Enhanced two-photon absorption and ultrafast dynamics of a new multibranched chromophore with a dibenzothiophene core.

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  • 1Physics Department, Fudan University, Shanghai 200433, People's Republic of China, Surface Physics Lab (National Key Lab), Fudan University, Shanghai 200433, People's Republic of China.


A series of novel compounds with dibenzothiophene core branched structures have been synthesized, and their two-photon absorption (TPA) properties were investigated. Two-photon fluorescence (TPF) and z-scan techniques were carried out, and a significant enhancement in the TPA cross section was observed for ST-G2, which possesses the largest generation number among the studied samples. By using different solvents, the largest nonlinear optical (NLO) response was observed in the most polar solvent. Ultrafast pump-probe experiments were performed to probe the excited state dynamics in the branched molecules, and the obtained results further confirmed the TPA enhancement mechanism. Time-resolved fluorescence (TRFL) and TRFL anisotropy measurements reveal that there is an ultrafast charge localization to the intramolecular charge transfer (ICT) state followed by relaxation with a lifetime longer than 1 ns.

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