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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72921

    Title: 層列C型/層列C*型液晶摻雜偶氮苯材料之光電特性研究;Electro-optical properties of azobenzene-doped smectic C / smectic C* liquid crystals
    Authors: 王弘毅;Wang, Hung-I
    Contributors: 光電科學與工程學系
    Keywords: 鐵電型液晶;偶氮苯材料
    Date: 2017-01-24
    Issue Date: 2017-05-05 17:16:51 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 表面穩定鐵電型液晶(Surface-stabilized ferroelectric liquid crystal,縮寫為SSFLC)具有快速反應及雙穩態的特性,因此有許多學者投入相當之心力進行相關研究。而雖表面穩定鐵電型液晶有上述優點,但亦有些缺點,如雪弗龍(Chevron)結構之缺陷及液晶盒間距限制及其均勻度之製程難度等。一般而言,為達表面穩定鐵電型液晶雙穩態特性,製程上必須使液晶盒之上下玻璃基板間距小於2 m,因此該領域的研究受到相當的限制。此外,偶氮苯材料亦由於該材料對光的反應及其同素異構化所衍生出的特性,在近幾年來受到相當的重視,本論文利用摻雜偶氮苯材料於鐵電型液晶中,並探討其相關之光電特性,其中偶氮苯材料包含偶氮苯液晶及偶氮苯手性材料。
    ;Surface-stabilized ferroelectric liquid crystals (SSFLCs) possess their unique characteristics of fast response and bistability. Many scientists have been paying much attention to this research topic in recent decade. Although SSFLCs have the advantages mentioned above, some shortcomings, such as Chevron defect, horizontal defect, and the limitation of small cell gap and uniformity, should be considered. Generally speaking, to obtain the property of bistability, the cell gap of the SSFLC cell is limited to be smaller than 2 m. As a result, the cell fabrication processes are extremely difficult so that the researches in this field gradually decrease.
    The rotation range in the plane of the LC cell of SSFLC molecules is dependent on the cone angles of the FLCs. According to our experimental results, the cone angle of the FLCs can be modulated by doping azobenzene materials into smectic C / smectic C*, and by illuminating with UV light. Moreover, the stability of azobenzene-doped SSFLCs can be enhanced by illuminating with UV light to get cis-azobenzenes, having relatively high electric dipole moment. To establish the mechanism of the generation of the SSFFLC stability, the electro-optical properties of SSFLCs, prepared by the mixtures of various azobenzenes and smectic C / smectic C*, have been studied before and after been treated with UV illumination. Accordingly, we believe that such a novel approach can improve the developments of the SSFLC in LC technology.
    Appears in Collections:[光電科學研究所] 博碩士論文

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