Two-photon absorption and two-photon excited fluorescence of triphenylamine-based multibranched chromophores

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• 作者：Xiaomei Wang ; Ping Yang ; Guibao Xu ; Wanli Jiang and Tianshe Yang
• 关键词：Two-photon absorption ; Two-photon excited fluorescence ; Triphenylamine-based multibranched chromophore
• 刊名：Synthetic Metals
• 出版年：2005
• 出版时间：15 December 2005
• 年：2005
• 卷：155
• 期：3
• 页码：464-473
• 全文大小：919 K

文摘

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 (Δμ_ge), the decreasing dihedral angle of intramolecular branch segments between S₀ and S states, and large excited charge redistribution make molecular δ_TPA value augment.