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研究生: 任雲懷
Jen, Yun-Huai
論文名稱: 濺鍍Y2SiO5薄膜電激發光元件結構材料性質之研究
Study of Structure Properties for Y2SiO5 Thin Film Electroluminescent Devices by RF Magnetron Sputtering
指導教授: 陳引幹
Chen, In-Gann
學位類別: 碩士
Master
系所名稱: 工學院 - 材料科學及工程學系
Department of Materials Science and Engineering
論文出版年: 2003
畢業學年度: 91
語文別: 中文
論文頁數: 105
中文關鍵詞: 氧化物螢光層交流薄膜電激發光元件
外文關鍵詞: ACTFEL devices, oxide phosphor layer
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  • 本實驗首先利用射頻磁控濺鍍系統成長交流薄膜電激發光元件(ACTFEL devices)之電極層、絕緣層與螢光層。藉由改變成長時的濺鍍功率、基板溫度、氣氛壓力以及退火溫度,期能找出Y2SiO5:Ce氧化物螢光層(oxide phosphor layer)的最佳成長條件。
    其次,改變傳統以固態法燒結鈦酸鋇基板的方式,利用刮刀成型法所製備的陶瓷薄片,施以不同燒結曲線來製作組織緻密、表面平坦的鈦酸鋇基板,並運用於薄膜EL元件的製作。
    最後以Ta2O5為絕緣層材料,成長單絕緣層與雙絕緣層之Y2SiO5:Ce交流薄膜電激發光元件,期能藉由螢光層與絕緣層之間的界面態增加,進而提升元件的發光特性。
    實驗結果顯示,不管是單絕緣層或雙絕緣層製作之EL元件在300V、頻率1kHz的驅動電壓下,均未能有明顯的發光現象。推測其原因應是(1)施加的電壓尚不足以驅動元件發光所致(2)螢光薄膜經退火處理後結構變的不均勻所致(3)螢光薄膜內Ce的含量過高所致。

    In the first of this experiment, we study the electrode layer, insulating layer and phosphor layer of ACTFEL devices by RF-magnetron sputter method. To deposit high quality Y2SiO5:Ce oxide phosphor layer, we had changed the substrate temperature, working pressure, sputtering power and annealing temperature, and then found out the optimum deposition condition.
    The second, we changed the way of traditional solid-state sintering method to prepare the BTO substrate, in stead of tape coating method to obtain ceramic sheets of dense structure and smooth surface by different sintering temperature treatment.
    Finally, we fabricated the Y2SiO5:Ce ACTFEL device of single and double insulating layer structure. By the increase of interface state between insulating layer and phosphor layer is to promote luminant properties of EL devices.
    The experimental results show that whenever single or double insulating layer structure, we all couldn’t discover any luminant phenomenon. We infer that reasons should be as following: (1) the voltage is not enough to driving EL devices (2) the structure of phosphor layer is not uniform after annealing treatment (3) the content of Ce atoms is too much in the phosphor layer.

    摘要 I Abstract II 目錄 III 表目錄 VII 圖目錄 VIII 第一章 緒論 1 1-1 薄膜EL元件的演進 1 1-2 薄膜EL元件的優點與缺點 3 1-3 研究目的 4 第二章 理論基礎與文獻回顧 12 2-1 薄膜電激發光(TFEL) 12 2-1-1 元件結構 12 2-1-2 發光機制 13 2-1-3 材料需求 15 2-2 氧化物電激發光材料 22 2-2-1 氧化鎵系材料 22 2-2-2 鎵酸鹽系材料 23 2-2-3 矽酸鹽系材料 23 2-2-4 鍺酸鹽系材料 24 2-2-5 多元基質材料 24 2-2-6 其他氧化物系材料 25 2-2-7 發光性能的改善 25 2-3 鈦酸鋇材料 28 2-3-1 鈦酸鋇的合成 28 2-3-2 鈦酸鋇的基本性質 29 2-3-3 鈦酸鋇微結構與燒結特性 29 2-3-4 鈦酸鋇的介電特性 30 2-4 濺鍍理論 34 2-4-1 電漿反應 34 2-4-2 濺鍍機構 35 2-4-3 薄膜成長 36 第三章 實驗步驟與方法 44 3-1 實驗流程 44 3-2 Y2SiO5:Ce靶材製備 44 3-3 BaTiO3基板製備 47 3-3-1 基板製作 47 3-3-2 基板清洗 47 3-4 薄膜之製備 49 3-4-1 Al濺鍍參數 49 3-4-2 ITO濺鍍參數 49 3-4-3 Ta2O5濺鍍參數 49 3-4-4 Y2SiO5:Ce濺鍍參數 49 3-4-5 濺鍍步驟 50 3-4-6 熱處理 50 3-4-7 微影製程 50 3-5 性質量測 55 3-5-1 膜厚量測 55 3-5.2 相成分鑑定 55 3-5-3 微結構觀察 55 3-5-4 介電性質量測 56 3-5-5 密度量測 57 3-5-6 光學性質量測 58 第四章 結果與討論 62 4-1 BaTiO3基板 62 4-1-1 XRD相成分分析 62 4-1-2 相對密度與燒結溫度之關係 62 4-1-3 介電常數與燒結溫度之關係 63 4-1-4 損失因子與燒結溫度之關係 64 4-2 元件相關薄膜特性 71 4-2-1 Al金屬電極薄膜 71 4-2-2 ITO透明電極薄膜 71 4-2-3 Ta2O5介電薄膜 72 4-3 Y2SiO5螢光層 84 4-3-1 靶材性質分析 84 4-3-2 濺鍍參數對薄膜性質之影響 84 4-3-3熱處理對薄膜性質之影響 85 4-4 EL元件 97 4-4-1 元件製作參數 97 4-4-2 發光性質分析 97 第五章 結論 101 參考文獻 102

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