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- W3004199350 abstract "Four substituted twistacenes decorated with different twisted π-conjugated units are synthesized to investigate their structure–property relationship. To improve the nonlinear optical (NLO) response of these twistacenes, phenyl, naphthyl, anthryl, and pyrenyl are selected as the twisted units to gradually increase the population of π-electrons. Broadband excited-state absorption (ESA) and reverse saturable absorption (RSA) of these compounds show a significant enhancement in femtosecond transient absorption spectra (TAS) and multiwavelength Z-scan experiments, respectively. The photophysical mechanism exhibits a typical feature of two-photon absorption (TPA)-induced ESA (TPA-ESA) on the singlet state. With the analysis of the electron transition calculated by the time-dependent density functional theory (TD-DFT), it can be inferred that TPA and ESA of these twistacenes are modulated by intramolecular charge transfer (ICT) and local excitation (LE), respectively. The TPA cross sections of these twistacenes at 515 nm are dramatically enhanced from 214 to 534 GM by introducing ICT, while the ESA cross sections are significantly increased from 1.2 × 10–21 to 6.5 × 10–21 m2 at 690 nm via strengthening LE with the π–π* feature. The result indicates that not only can TPA and ESA be enhanced simultaneously but also the selective modulation of the nonlinear optical (NLO) properties can be achieved in such kinds of compounds." @default.
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- W3004199350 date "2020-01-31" @default.
- W3004199350 modified "2023-10-16" @default.
- W3004199350 title "Enhanced Reverse Saturable Absorption in Substituted Twistacenes from Visible to Near-Infrared: Modulation of Terminal Twisted π-Conjugated Units" @default.
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- W3004199350 doi "https://doi.org/10.1021/acs.jpcc.9b10630" @default.
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