Two-photon absorption of a series of V-shape molecules:the influence of acceptor's strength on two-photon absorption in a noncentrosymmetric D-pi-A-pi-D system

摘要

A series of V-shape D-pi-A-pi-D molecules were synthesized based on pyrimidine as the acceptor.The strength of the acceptor (A) in these molecules was systematically adjusted through changing the substituent group in pyrimidine.Their two-photon absorption properties were measured by two-photon induced fluorescence techniques with a mode-locked Ti:sapphire laser (100 fs,80 MHz) in the range of 720 to 880 nm.The results indicate that the strength of the acceptor has an important influence on the two-photon absorption properties of this noncentrosymmetric D-pi-A-pi-D system,and a molecule with a strong acceptor is liable to display a large two-photon absorption cross-section.