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- W1974499462 abstract "A specific series of dumbbell-shaped bis-carbazoles or bis-phenothiazines dyes (1, 2, 3 and 4) constructed with styrene or biphenylethyne as the π-bridge have been synthesized and characterized. Detailed spectral properties including linear absorption, one and two-photon fluorescence properties were investigated. The results show that extending conjugated chain and introducing donors have substantial effect on their photophysical properties. Among them, two-photon absorption cross sections (σ) of the four dyes in DMF determined by the Z-scan technique are successively increased from 1 to 4 with enhancing electron-donating ability and extending conjugated chain, but electron-donating ability has larger contribution to the σ values than extending conjugated chain based on the comparison of small molecules (D–π–D). Two-photon initiation polymerization (TPIP) microfabrication experiments have been carried out using compound 4 as an initiator under irradiation of 200 fs, 76 MHz femtosecond laser at 760 nm. The results confirm that the four dyes can be effectively used as organic two-photon photopolymerization initiators." @default.
- W1974499462 created "2016-06-24" @default.
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- W1974499462 date "2014-01-01" @default.
- W1974499462 modified "2023-10-16" @default.
- W1974499462 title "Four new two-photon polymerization initiators with varying donor and conjugated bridge: Synthesis and two-photon activity" @default.
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- W1974499462 doi "https://doi.org/10.1016/j.saa.2013.09.051" @default.
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