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首页> 外文会议>Conference on multiphoton absorption and nonlinear transmission processes: Materials, theory, and applications >Molecular Engineering of Nanoscale Quadrupolar Chromophores for Two-Photon Absorption
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Molecular Engineering of Nanoscale Quadrupolar Chromophores for Two-Photon Absorption

机译：纳米级Quadrupolar发色团的分子工程，用于双光子吸收

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Our aim has been the design of optimized NLO-phores with very high two-photon absorption (TPA) cross-sections (σ_2) in the red-NIR region, while maintaining high linear transparency and high fluorescence quantum yield. Our molecular engineering strategy is based on the push-push or pull-pull functionalization of semi-rigid nanoscale conjugated systems. The central building blocks were selected as rigid units that may assist quadrupolar intramolecular charge transfer by acting either as a (weak) donor or acceptor core. Quadrupolar molecules derived either from a phenyl unit, a rigidified biphenyl moiety or a fused bithiophene unit have been considered. Conjugated oligomers made of phenylene-vinylene and/or phenylene-ethynylene units were selected as connecting spacers between the core and the electroactive end groups to ensure effective electronic conjugation while maintaining suitable transparency/fluorescence. The TPA cross-sections were determined by investigating the two-photon-excited fluorescence properties using a Ti:sapphire laser delivering fs pulses. Both the nature of the end groups and of the core moiety play an important role in determining the TPA spectra. In addition, by adjusting the length and nature of the conjugated extensor, both amplification and spectral tuning of TPA cross-sections can be achieved. As a result, push-push fluorophores which demonstrate giant TPA cross-sections (up to 3000 GM) in the visible red, high fluorescence quantum yields and good transparency in the visible range have been obtained.
机译：我们的目的一直是优化的NLO-Phores设计，具有在红导体区域中具有非常高的双光子吸收（TPA）横截面（σ_2），同时保持高线性透明度和高荧光量子产率。我们的分子工程策略基于半刚性纳米级共轭系统的推挽或拉拉官能化。中央积木被选择为刚性单元，其可以通过作为（弱）供体或受体核心作用来帮助四脉状分子内电荷转移。已经考虑了从苯基单元衍生的Quadrupolar分子，已经考虑了刚性的联苯部分或稠合的二硫代丙烯烯单元。选择由亚苯基 - 乙烯基和/或亚苯乙烯单元制成的共轭低聚物作为连接核心和电活性端基之间的连接间隔物，以确保有效的电子缀合，同时保持合适的透明度/荧光。通过使用Ti：Sapphire激光输送FS脉冲来研究TPA横截面。结束组和核心部分的性质都在确定TPA光谱方面发挥着重要作用。另外，通过调节共轭伸伸的长度和性质，可以实现TPA横截面的放大和光谱调谐。结果，已经获得了在可见红色，高荧光量子产率和在可见范围内的良好透明度中展示巨型TPA横截面（高达3000mG）的推送荧光团。

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