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研究生： 邱健華
Chiu, Chien-Hua
論文名稱： 碳酸銫/鋁陰極界面於高分子電激發光二極體元件效率之影響
The studies of Cesium Carbonate/Aluminum cathode structure in polymer light-emitting diodes
指導教授： 藍永強
Lan, Yu-Chiang
郭宗枋
Guo, Tzung-Fang
學位類別： 碩士
Master
系所名稱： 理學院 - 光電科學與工程研究所
Institute of Electro-Optical Science and Engineering
論文出版年： 2009
畢業學年度： 97
語文別： 中文
論文頁數： 125
中文關鍵詞： 碳酸銫 、鋁 、陰電極 、有機電激發光二極體 、藍光
外文關鍵詞： cathode, Aluminum, organic light emitting diode, Cesium Carbonate, blue light
相關次數： 點閱：76  下載：1 
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    • 在本研究中，我們以藍光高分子材料編號Blue252作為主動層搭配Cesium Carbonate/鋁電極的方式製作出高效率藍光元件，其元件特性相較於Ca/Al、PEO/Al陰極結構的元件，其最大亮度為1736 cd/m2 at 6.8 V、效率可達到1.04 cd/A、CIE值為(0.16, 0.13)。為了探討為何藍光高分子材料Blue252搭配Cesium Carbonate/鋁電極元件之光電特性表現最優異，我們從XPS(X-ray Photoelectron Spectroscopy, XPS)光學量測儀器與UPS(Ultraviolet Photoelectron Spectrometry, UPS)光學量測儀器去分析Cs2CO3/Al陰極界面，藉由各個元素發現到在Cs2CO3/Al相較於純Al金屬界面多了C-Al鍵結，並且Cs元素會失去電子轉而帶正電荷，將其所失去的電子轉移到Al元素身上，因此我們認為以上兩種機制為主要影響元件效率的關鍵因素。
    此外，本論文也針對蒸鍍Cesium Carbonate的溫度和Cesium Carbonate搭配Al金屬對不同主動層是否也會使元件的光電特性有所影響做進行探討。

    In this work, we used a blue light emitting copolymer fluorene as active layer with Cesium carbonate/Aluminum cathode to produce highly efficient blue light-emitting diodes. The emission characteristics are also compared to with other cathode structures Ca/Al, PEO/Al. For Cs2CO3/Al a maximum brightness of 1736 cd/m2 at 6.8 V, and an efficiency of 1.04 cd / A were obtained with a CIE value of (0.16, 0.13).
    We used the XPS(X-ray Photoelectron Spectroscopy, XPS) and UPS(Ultraviolet Photoelectron Spectrometry, UPS) measurements to analyze Cs2CO3/Al cathode interface, we found out that more Al-C bonds were formed for Cs2CO3/Al compared to pure Aluminum interface and among the various elements, Cs element will lose electrons and become positive, losing its electron to Aluminum element. Therefore we think that these two kinds of mechanisms are major contributors and effect the efficiency of device.
    In addition, we also studied for the deposition of (i) Cs2CO3 at different
    temperature and (ii) Cs2CO3 with Al metal on different active layer components to explore their influence on optical and electrical properties.

    目錄 中文摘要.................................................Ⅰ 英文摘要.................................................Ⅱ 致謝.....................................................Ⅲ 目錄.....................................................Ⅳ 圖目錄...................................................Ⅷ 表目錄..................................................XII 第一章 緒論...............................................1 1-1 前言..................................................1 1-2有機電激發光元件之發展現況與沿革.......................4 1-2-1 有機發光元件的歷史...............................4 1-2-2 OLED與PLED之比較 .............................8 1-3 操作原理.............................................11 1-3-1 PLED的結構與發光原理...........................11 1-3-2有機發光二極體結構之發展與元件表現影響...........16 1-4研究動機與大綱........................................19 1-4-1 研究動機........................................19 1-4-2 研究大綱........................................20 第二章 實驗方法與步驟....................................22 2-1 實驗材料及化學結構...................................22 2-2 元件組裝及量測.......................................27 2-2-1 ITO玻璃基板圖案化...............................27 2-2-2 ITO玻璃基板處理.................................30 2-2-3 ITO表面修飾方法及主動層的配置...................32 2-3 元件組裝及量測及儀器基礎理論.........................35 2-3-1元件光電特性量測.................................35 2-3-2 X-ray光電子能譜儀原理...........................35 2-3-3 UV-ray光電子能譜儀原理..........................39 2-3-4 PL螢光光譜儀原理................................40 2-3-5 UV-Vis光譜儀原理................................43 第三章 藍光高分子有機電激發光二極體在不同陰極結構之元件表現差異探討.................................................46 3-1 前言.................................................46 3-2藍光高分子材料基本特性之分析(UV-Visible、PL)...........47 3-2-1藍光材料對能帶分析...............................48 3-2-2 藍光材料之螢光光譜對溫度的影響..................61 3-3 藍光高分子有機電激發光元件之光電特性量測.............64 3-4 相異陰極結構Built-in potential於元件表現差異之探討...73 3-5 結論.................................................79 第四章 對Cs2CO3/Al、Ag界面分析與探討.....................80 4-1 前言.................................................80 4-2 藍光高分子有機電激發光元件對陰電極界面之XPS分析....81 4-2-1 Cs2CO3/Al電極界面之XPS分析.....................81 4-2-2 Cs2CO3/Ag電極界面之XPS分析.....................89 4-3 藍光高分子有機電激發光元件對陰電極界面之UPS分析.....96 4-3-1 Cs2CO3/Al電極界面之UPS分析.....................96 4-3-2 Cs2CO3/Ag電極界面之UPS分析.....................98 4-4 結論................................................104 第五章 不同藍光高分子有機電激發光元件之製作與光電特性量測......................................................106 5-1 前言................................................106 5-2改變不同碳酸銫蒸鍍溫度之製作與光電特性量測.........107 5-2-1不同蒸鍍溫度對Cs2CO3/Al電極光電特性量測...........107 5-2-2不同蒸鍍溫度對Cs2CO3/Ag電極光電特性量測...........111 5-3 碳酸銫/鋁陰極結構對不同主動層材料的影響與探討.......114 5-4 結論.............................................118 第六章 總結與未來工作建議...............................119 參考文獻................................................121

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