Theoretical investigation of the one-photon and two-photon absorption properties for star-shaped polycyclic aromatic based on oligothiophenes-functionalized truxene

Molecular geometries, one-photon and two-photon absorption properties of a series of star-shaped chromophores with oligothiophenes as the branches and a functionalized truxene as the core have been theoretically investigated using density functional theory and ZINDO–SOS method. The results indicate that the enlargement of the conjugation length of the system is an efficient way to increase the two-photon absorption cross section.