| Summary: | 碩士 === 國立中央大學 === 化學學系 === 103 === The purpose of this study is to utilize absorption spectroscopy,
fluorescence spectroscopy, and femtosecond pulsed laser to
measure the absorption spectra, fluorescence spectra, fluorescence
lifetimes, fluorescence quantum yield and two-photon absorption
spectra of three series of model molecules. This thesis is divided
into six chapters and organized as follows:
Chapter1: Introduction; Chapter2: Molecular Design;
Chapter3: Result and Discussion; Chapter4: Synthesis;
Chapter5: The spectrum of nmr and mass, and Chapter6:
Experimental Section.
The experimental results show that: (1) using
thieno[3,4-c]pyrrole-4,6-dione as the π-center and
electron-donating functional units as the end-groups will lead to
better two-photon absorption; (2) all the imidazole-containing
model compounds show high fluorescence quantum yields, but the
incorporation of fluorene units does not lead to effective
charge-transfer upon excitation. Therefore the molecular
two-photon absorption performance of such model chromophores
are under our expectation; (3) increase the number of thiophene
units or extend the conjugated length of fused thiophene unit can
effectively reduce band-gap and enhance the molecular
two-photon absorption.
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