本文主要是探討金屬和有機層間的蕭特基能障，對有機發光二極體電流-電壓特性曲線的的影響。對單載子單層有機發光二極體: 金屬層 / Alq3 (Organic layer) / 金屬層。其注入電流隨著“有機－金屬”接觸位能障減少而增加。在鋁(Al)陰極和Alq3有機層之間，插入一個薄的氟化鋁（LiF）層，顯示可以提升電子注入效率和發光效率。隨著LiF薄膜厚度增加時，在Al陰極和LiF薄膜的界面間 “位能障降低”和 “穿隧作用”，兩著參數都會下降。對薄的LiF層來說，“位能障降低”為主要的有利的效應，但當薄膜厚度增加時，“穿遂作用”降低，LiF層薄膜厚度有效的主導電流-電壓特性。

除對不同的陰極金屬電極，去模擬有機發光二極體(OLEDs) 的電流－電壓特性曲線；進一步，於金屬和有機材料之間插入LiF層，模擬其電流－電壓特性曲線；再進一步；使用不同厚度的LiF層，模擬其電流－電壓特性曲線。最後比較以上這些模擬的結果，並對單載子單層有機發光二極體元件特性，做完整的描述。

In this study, the dependence of metal/Alq3 Schottky contact barrier on the current–voltage characteristics of organic light emitting diodes was investigated to know the charge injection mechanism of OLED with the single-layer metal/Alq3/ metal structures, and the current density increases obviously with the reduction of contact potential barrier.
As the thin LiF layer is inserted between the Al electrode and the Alq3 layer, it shows that the electron injection was promoted, and higher electroluminescence efficiency was also obtained. Both the energetic barrier and the tunneling integral parameter are reduced when the LiF layer thickness increases. For very thin films of LiF, the beneficial effect of the barrier reduction is dominant. When the film grows thicker, the negative insulating effect becomes dominant.
Besides of simulating the current–voltage characteristics of organic light emitting diodes (OLED) based on Alq3 in combination with different cathodes, it was simulated that the current–voltage characteristics of OLED with an inserted LiF layer between metal and organic material, and then the OLED with various thicknesses of LiF films were also simulated. Finally, the result of simulations was compared to achieve a better description for the characteristics of current–voltage for the single carrier and layer based OLED.

第一章 1
緒論 1
1－1 有機發光二極體的發展 2
1－2 有機發光二極體的優點與發展趨勢 3
1－3 有機發光二極體發展趨勢 5
1-3-1主動矩陣與被動矩陣驅動有機發光顯示器 5
1-3-2 OLED 底部發光與頂部發光結構 7
1-4 研究動機 8
第二章 9
有機發光二極體工作原理 9
2－1 有機發光二極體的螢光與磷光 9
2－2 有機發光二極體的發光原理 10
2－3 有機發光二極體的量子效率 11
2-3-1 單重項態與三重項態的比值 11
2-3-2輻射性光發光效率 12
2-3-3光輸出的耦合 13
2－4 有機發光二極體的結構 13
2-4-1 單層型有機發光元件 13
2-4-3 多層有機發光元件 14
第三章 15
有機發光二極體注入與傳輸分析 15
3-1-1單一金屬電極 17
3-1-2合金金屬電極-MgAg、Al:Li 17
3-1-3薄絕緣層 18
3-2-1 缺陷電荷限制傳輸 20
3-2-2 無缺陷的空間電荷限制傳輸 21
3-2-1穿透(tunneling)理論 22
3-2-2能帶彎曲 22
3-2-3金屬在Alq3 (有機層)作用 23
3-2-3 絕緣層電偶極（dipole） 24
第四章 26
模型 26
4-1模型建立和假設 26
4-1-1蕭特基能障模型 26
4-1-2蕭特基能障高度的不理想效應 29
4-1-3假設條件 29
4-1-4模型修正 31
4-2模擬結果和比較 33
4-3討論與分析 33
第五章 34
結論 34

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