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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/66759


    Title: 合成各類以雜環為核心的分子並研究其非線性光學性質;Synthesis and investigation of nonlinear optical properties of various organic molecules with different heterocyclic cores
    Authors: 劉倚佑;LIOU,YI-YOU
    Contributors: 化學學系
    Keywords: 非線性;雙光子吸收;雜環
    Date: 2014-12-29
    Issue Date: 2015-03-16 15:10:44 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本論文利用吸收光譜儀和螢光光譜儀以及飛秒脈衝式雷射來激
    發模型分子,量測模型分子的吸收光譜、螢光光譜、螢光生命期、螢
    光量子產率和非線性光學中雙光子吸收的效應,論文總共分為六個章
    節, 11 個模型分子, 三個系列作為探討; 三個系列分別以
    Thieno[3,4-c]pyrrole-4,6-dione(TPD)、咪唑(imidazole)及噻吩(thiophene)
    做為不同的共軛中心來進行討論,歸類出以下結論:
    [1]以TPD為共軛中心,兩邊掛有推電子官能基對雙光子吸收有較好表
    現。
    [2]咪唑連接的分子具有較佳的量子產率,但引入芴共軛單元無法做
    有效的π電子轉移,導致雙光子吸收表現不如預期。
    [3]延長噻吩數目可以有效的降低吸收能隙,提升雙光子吸收的表
    現。;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.
    Appears in Collections:[Graduate Institute of Chemistry] Electronic Thesis & Dissertation

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