The first examples of heterocycle-based multi-branched dyes with efficient two-photon absorption (TPA) activity are reported; the novel chromophores exhibit large TPA cross sections (as high as 1600 × 10−50 cm4 s photon−1 molecule−1, measured with 150 fs laser pulses at 800 nm); a strong cooperative enhancement in the branched systems with respect to the one-dimensional sub-units is found.
报告了首个具有高效双光子吸收(
TPA)活性的基于杂环的多支链
染料实例;这些新型发色团表现出较大的
TPA 截面(高达 1600 × 10-50 cm4 s 光子-1 分子-1,使用 800 纳米波长的 150 fs 激光脉冲测量);发现支链系统相对于一维子单元具有很强的协同增强作用。