臺灣博碩士論文加值系統

本研究主要是探討串聯結構式有機發光二極體(organic light emitting diode，OLED)的發光特性及物理機制。首先製作了一個初始的串聯式有機發光二極體，並使用紅色與藍色兩個發光單元做串聯，結合了連接層，電洞注入材料HAT-CN為一個電子受體，具有低（lowest unoccupied molecular orbital，LUMO）能階再配合Al/LiF作為電子提取，完成初始的串聯有機發光二極體。接著探討在串聯式有機發光二極體中扮演重要角色的電荷產生單元 (charge generation unit，(CGU))其對元件發光特性的影響；使用不同的連結層設計，以電流密度分析電荷產生的能力與趨勢。在NPB層中摻雜了HAT-CN，呈現了一個高效率穩定的電荷產生單元特性，其可用來改善串聯式有機發光二極體光電特性。此外，利用電洞傳輸層和電荷產生單元之間的能階設計技術，有效地減少元件之驅動電壓。最後探討演串聯式OLED之演色性指數(color rendering index，CRI)特性。為提高CRI製作了以兩個單一發光層的白色有機二極體作為發光單元，並結合高效率的電荷產生單元，以實現高演色性和高色彩穩定性串聯式白光有機發光二極體。

We demonstrate the electroluminescence (EL) properties of a low power consumption, high efficiency and stability of tandem organic light emitting diode (OLED). Its EL properties were improved by using a charge generation unit (CGU) combining a doped hole transporting layer (HTL) with bipolar transport ability. In addition, the design of a mechanism to align the energy level between the HTL and CGU shows effectively decreasing the operating voltage of the devices.The deposition of a LiF/Al/NPB:HAT-CN CGU in tandem OLED achieves in more than twofold improvement in the current efficiency. Our findings show that bipolar transport ability is a promising approach for easy-fabrication as well as high color rendering index and chromatic-stable tandem white OLED for future display and lighting application.

目錄
摘要 I
Abstract III
誌謝 IV
圖目錄 IX
表目錄 XV
第一章　有機發光二極體介紹 1
1-1　照明設備和顯示器的發展 1
1-2　有機發光二極體的歷史介紹 2
1-3　有機發光二極體之優點 3
第二章　有機發光二極體的顯示原理 6
2-1　有機發光二極體的材料介紹 6
2-1-1　陰極材料 6
2-1-2　陽極材料 7
2-1-3　電洞注入層(HIL) 8
2-1-4　電子注入層(EIL) 9
2-1-5　電洞傳輸層(HTL) 9
2-1-6　電子傳輸層(ETL) 10
2-1-7　發光層(EML) 10
2-1-8　載子飄移率 11
2-1-9　連結層電荷產生單元 11
2-2　有機發光二極體工作原理 12
2-2-1　有機材料吸收與放射 12
2-2-2　能量轉移 14
2-2-3　效率的計算 14
2-2-4　固態溶劑效應 15
2-2-5　空間電荷限制電流 16
2-2-6　極化效應 16
2-2-7　p-i-n結構 16
2-2-8　電荷分離 17
第三章　實驗和測量系統配置 20
3-1　實驗材料 20
3-2　材料蒸鍍的製備 23
3-3　玻璃基板 24
3-4　蒸鍍系統 25
3-5　量測系統 27
第四章　結果與討論 28
4-1　初始構想串聯式有機發光二極體之改變NPB層厚度 30
4-2　單一發光單元之NPB層厚度 39
4-3　連結層之電荷產生單元 51
4-4　加入不同電荷產生單元的串聯有機發光二極體 60
4-5　改變不同摻雜濃度的DCJTB串聯式有機發光二極體 68
4-6　改變不同摻雜濃度DCJTB之多摻雜發光層的有機發光二極體 79
4-7　改變不同摻雜濃度DCJTB之串聯式有機發光二極體 88
第五章　結論 99
參考文獻 101
論文集 105

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