Abstract
Comparative investigations were performed to determine how thiophene group modifications affect the two-photon absorption properties of a donor-π-acceptor compound. Specifically, linear absorption and one/two-photon fluorescence spectra, open-aperture Z-scan, time-resolved spectroscopy and quantum chemical calculations were performed. After thiophene modification, the two-photon absorption cross-section of compound R1’ was determined to be 264 GM, exhibiting a 1.6-fold enhancement compared with that of compound R1. A transient absorption spectra experiment together with quantum chemical calculations were performed to investigate the effect of thiophene modification on the ultrafast response and intramolecular charge transfer properties of the dipolar compounds. The results indicate that the thiophene group modification on the conjugated bridge and terminal ends plays an important role in the two-photon absorption and intramolecular charge transfer properties.
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