发色团
化学
双光子吸收
光化学
深铬移
荧光
飞秒
吸收截面
吸收(声学)
激发态
激光器
光学
原子物理学
横截面(物理)
量子力学
物理
作者
Hongli Wang,Zhen Li,Pin Shao,Yanke Liang,Liaobin Chen,Jingui Qin,Qihuang Gong
摘要
This paper reports the synthesis of a series of donor-substituted 3,5-dicyano-2,4,6-tristyrylpyridine derivatives, having two-dimensional branched D-π-A structures, as new two-photon absorption (TPA) chromophores. These chromophores are stilbene-type chromophores containing the same acceptor group but end-capped with different aromatic groups as the donors. Measured as the two-photon-induced fluorescence in chloroform solvent, using a femtosecond multipass Ti∶sapphire amplifier as the irradiation source, the TPA cross section values of some compounds are on the order of 10−48 cm4 s photon−1. These chromophores also have relatively high two-photon-excited fluorescence (TPEF) action cross sections. Pumped by the laser at 800 nm, these chromophores show efficient two-photon-induced orange-red fluorescence emission. The experimental results indicate that the different end-capped functional electronic donors and the number of branches of these chromophores affect their one-photon properties, two-photon up-conversion emission behavior and TPA cross section values. Especially, with increasing numbers of branches, λabsmax and λspfmax exhibit bathochromic shifts, while their two-photon absorption cross sections also increase. Compared with the two-branched chromophore 6, the tribranched chromophore 4 shows a larger TPA cross section, and the cooperative enhancement of the TPA cross section from 6 to 4 is 1.2-fold at 800 nm.
科研通智能强力驱动
Strongly Powered by AbleSci AI