Abstract
New non-linear optical (NLO) chromophores with triphenylamine as molecular “core” bearing one, two, or three 4- n-butoxystyryl group(s) as molecular branch(es), respectively, have been synthesized and characterized. Pumped by femtosecond laser pulse in 730–870 nm regions, chromophores in solvent exhibit strong two-photon excited fluorescence (TPF) and large two-photon absorption (TPA) cross-section ( δ TPA) with the increase of molecular branch. Theoretical calculations confirm that the increasing dipole moment difference (Δ μ ge), the decreasing dihedral angle of intramolecular branch segments between S 0 and S states, and large excited charge redistribution make molecular δ TPA value augment.
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