使用共主體結構之長壽命白光有機發光二極體

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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
相關次數：	點閱：3 下載：0
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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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