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研究生： 蔡永誠
Tsai, Yung-Cheng
論文名稱： 使用共主體結構之長壽命白光有機發光二極體
Long-Lifetime White Organic Light-Emitting Diode Using Mixed Host
指導教授： 周卓煇
Jou, Jwo-Huei
口試委員:
學位類別： 博士
Doctor
系所名稱： 工學院 - 材料科學工程學系
Materials Science and Engineering
論文出版年： 2010
畢業學年度： 98
語文別： 中文
論文頁數： 112
中文關鍵詞： 有機發光二極體 、白光 、壽命 、共主體
外文關鍵詞： organic light-emitting diode, white light, lifetime, mixed hot
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    • 本研究利用共主體結構，製作出一系列具雙發光層之白光有機電致發光元件 (Organic Light Emitting Diode, OLED)。所製備之白光OLED s可分為二個部分：
    第一部份為單層共主體結構：於第一層黃色發光層中使用50 wt.% N,N'-diphenyl-N,N'-bis-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (NPB)和50 wt.% 2-(t-butyl)-9,10-bis-(2'-naphthyl) anthracene (TBADN)之共主體，並摻雜1 wt.%黃光染料rubrene，第二層藍色發光層中使用藍光主體TBADN，並摻雜2 wt.% 藍光染料4,4'-bis [2-{4-(N,N-diphenylamino)phenyl}vinyl]- biphenyl。利用此單層共主體結構所製備之白光元件，壽命較未使用共主體結構提升五倍，且在10 mA/cm2下，發光效率由4.5 lm/W提升到6.0 lm/W，增加33%；元件壽命與效率之提升，可歸因於單層共主體結構有效分散電荷於二個介面，且具較佳的電荷平衡。
    第二部份為雙層共主體結構：除在第一層黃色發光層中使用50 wt.% NPB和50 wt.% 10,10'-bis-biphenyl-4-yl- [9,9']bianthracenyl (BANE)之共主體並摻雜1 wt.%黃光染料rubrene外，又於第二層藍色發光層中導入5 wt.% NPB於BANE形成共主體，並摻雜5 wt.% 深藍光染料4,4'-bis-[4-{N,N,N',N'-tetrakis-(4-fluoro-diphenylamino)- phenyl}-vinyl]-biphenyl，所製備之白光元件，其壽命較單層共主體結構增加75%，為藍光元件的六倍、接近長壽命的黃光元件。元件壽命進一步的提升，是由於雙層共主體結構可將電荷更有效分散於三個介面，避免過多電荷累積於發光介面，進而造成損壞，影響元件壽命。

    獻 ………………………………………………………………Ⅰ 摘要 ……………………………………………………………Ⅱ 致謝 ……………………………………………………………Ⅳ 目錄 ……………………………………………………………Ⅴ 表目錄 …………………………………………………………Ⅷ 圖目錄 …………………………………………………………Ⅸ 壹、緒論 ………………………………………………………1 貳、文獻回顧 …………………………………………………4 2-1、有機發光二極體的歷史發展……………………………4 2-2、發光原理…………………………………………………8 2-2-1、摻雜技術與能量轉移…………………………………9 2-2-2、螢光與磷光……………………………………………11 2-2-3、電荷的注入、傳導與再結合…………………………12 2-3、OLED有機材料……………………………………………17 2-4、白光有機發光二極體之發展……………………………19 2-4-1、單一發光層白光元件…………………………………20 2-4-2、積層發光層白光元件…………………………………23 2-5、影響元件壽命的機制……………………………………27 2-5-1、黑點劣化………………………………………………27 2-5-2、本質劣化………………………………………………29 2-6、實驗動機與構想…………………………………………34 參、實驗方法 …………………………………………………37 3-1、實驗流程…………………………………………………37 3-2、有機材料與特性分析……………………………………38 3-3、ITO基板清洗 ……………………………………………41 3-4、O2電漿前處理……………………………………………42 3-5、真空蒸鍍…………………………………………………43 3-6、封裝………………………………………………………44 3-7、元件特性量測……………………………………………44 3-8、壽命量測…………………………………………………46 肆、結果與討論 ………………………………………………48 4-1、單層共主體白光OLED元件………………………………48 4-1-1、元件結構與鍍膜參數…………………………………48 4-1-2、單層共主體對白光元件電致發光光譜之影響………49 4-1-3、單層共主體對白光元件覆合區之影響………………49 4-1-4、單層共主體對白光元件發光效率之影響……………51 4-1-5、單層共主體對白光元件壽命之影響…………………52 4-1-6、單層共主體對白光元件色安定性之影響……………53 4-2、雙層共主體白光OLED元件………………………………55 4-2-1、元件結構與鍍膜參數…………………………………55 4-2-2、雙層共主體對白光元件電致發光光譜之影響………56 4-2-3、雙層共主體對白光元件覆合區之影響………………56 4-2-4、雙層共主體對白光元件發光效率之影響……………57 4-2-5、雙層共主體對白光元件壽命之影響…………………59 4-2-6、雙層共主體對白光元件色安定性之影響……………61 伍、結論 ………………………………………………………63 陸、參考資料 …………………………………………………65 柒、表與圖 ……………………………………………………71

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