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    题名: 電致發光電池中電解質的結構與物性探討
    作者: 徐若韶;Ruoh-Shaur Hsyu
    贡献者: 化學研究所
    关键词: 電致發光電池;有機共軛高分子;高分子電解質;Light-emitting Electrochemical Cell;LEC;Organic conjugated polymer;polymer electrolyte
    日期: 2000-07-12
    上传时间: 2009-09-22 10:08:17 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 高分子發光二極體是近年來共軛高分子最有工業發展潛力的應用項目之一,PPV系高分子因其優異的螢光性,廣泛應用於發光二極體的製作。但要進一步工業化仍有困難存在,為增進量子效率出現各式改良方法,其中之一為電致發光電池(light-emitting electrochemical cell, LEC)。目前文獻對其結構與物性之關係的報導並不多,針對這點本研究利用熱分析法(TGA、DSC)、光譜分析法(IR、UV及PL)、核磁共振法(NMR)及表面分析工具(AFM)探討混摻高分子電解質的載子傳導機構。 我們的研究顯示PdOPV (poly(dioctyloxy phenylene vinylene))為PPV上烷氧基雙取代之聚合物,其最大吸收波長(λmax)為592nm,玻璃轉移溫度(Tg)在0℃。 將PdOPV與PEO(poly ethylene oxide)及LiClO4混摻後即成為所需之電解質。其UV及PL光譜往紅位移方向移動,是由於PEO促使PdOPV分子立體規則提高,增加有效共軛長度所致。 而IR光譜則顯示兩種高分子之間並無強分子間作用力存在。但由13C NMR光譜中化學位移的變化見到高分子介面的形成。7Li NMR則清楚地知道鋰離子在混摻系統各成分中的含量,隨著不同的混摻比例及不同的溫度變化而有顯著的改變。 我們更藉由半高寬得到活化能(Ea)的資訊,並配合AFM的表面分析,我們得到鋰離子在PdOPV及PEO之間的配位結構,以及PdOPV中的鋰離子是藉由PEO區塊而進入其中的傳導機制。這些是首次將核磁共振法應用於LEC電解質所獲致的成果。 Polymer light-emitting diode (LED) the one of potential commercial applications of conjugated polymers has been studied for few years. Poly (p-phenylene vinylene)s (PPVs) are widely used for the fabrication of polymeric light-emitting diode (LED) owing to their excellent photoluminescence properties. However it is difficulty to commercialize for low quantum efficiency. One way to improve the quantum efficiency is composition into light-emitting electrochemical cells (LECs). Rare studies are focused on their structure/properties relationships. In this study, we investigated the blended electrolytes of LECs and their structures and properties. We are carried out thermal analyses, spectroscopy analyses, NMR analyses and surface analyses to characterize these LEC samples. Alkoxy ring-substituted PPV, poly(dioctyloxy phenylene vinylene) (PdOPV), emits on orange light (λmax, PL = 592 nm) region. The glass-transition temperature is at 0℃ for all LEC samples. The electrolytes are blended from PdOPV with poly(ethylene oxide)(PEO) and LiClO4. PEO improves regulations and increases the effective conjugating length of PdOPV, so the UV and PL spectra have red shift. IR spectra show that there are no strong molecular forces between two polymers. From the variations of chemical shift in 13C NMR spectra we can observe the formation of interface between polymers. The contents of lithium in blending systems are changed obviously with changing blending ratios and temperature. The activation energy (Ea) obtained form half-height width of NMR. Surface analyses from AFM and Ea values can realize the coordination structure of lithium between PdOPV and PEO. In concluded, we have found that the transformation mechanism of lithium in PdOPV domain is controlled by PEO domain. For the first time, electrolytes of LEC is characterized by solid state NMR and AFM.
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