| Summary: | 碩士 === 國立中央大學 === 化學學系 === 104 === Four different molecular systems are characterized and studied for
their nonlinear absorption properties in this thesis. Among these four model
systems, three are conjugated dye compounds with various molecular
structures as follows:
Series1: Tetrathienoacene-cored (TTA-cored) chromophores.
Series2: Cruciform chromophores with various electron-donors and
electron-acceptors.
Series3: Carbazole-based muti-branched chromophores.
The fourth model system is the perovskite quantum dot.
Based on the measured linear and nonlinear optical properties, some
features and structure-property relationships can be summarized:
[1] For the TTA-cored dyes system, it is revealed that introducing a
thiophene unit in between the electron-donating unit (i.e. triphenylamine)
and TTA moiety will lead to promoted molecular two-photon absorptivity.
[2] For the cruciform chromophores, the combination of electron-donor and
electron-acceptors plays an important role for their two-photon-related
properties.
[3] For carbazole-based dye system, it is noted that both the two-photon
and three-photon response are enhanced with the number of peripheral
branches increased.
[4] Two-photon absorption can be observed in perovskite quantum dot by
femtosecond laser.
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