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研究生:朱秋萍
研究生(外文):Chiu-Ping Chu
論文名稱:雙層有機發光二極體之電荷傳輸機制的分析
論文名稱(外文):Analysis of the Charge Transport Mechanisms in Bilayer Organic Light-Emitting Diode
指導教授:翁恆義
指導教授(外文):Heng-Yi Ueng
學位類別:碩士
校院名稱:國立中山大學
系所名稱:電機工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:105
中文關鍵詞:模擬蒙地卡羅雙層有機發光二極體傳輸
外文關鍵詞:bilayernumerical modelOLEDtransportcharge
相關次數:
  • 被引用被引用:3
  • 點閱點閱:153
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
影響有機發光二極體特性的重要因素是有機材料中電荷載子的行為。因此,去學習並了解電荷在有機層的傳輸行為是重要的。然而使用在有機發光二極體的有機材料通常是高阻抗且為低載子移動率,所以不能使用一般的半導體模型。
本論文首先建立有機發光二極體的傳輸模型,其模擬基礎是以Lampert的電流模擬方式及電流連續性的觀念,和利用蒙地卡羅(Monte Carlo)模擬方式。在計算中使用亂數(random number)的計算法,進一步延伸應用在有機發光二極體之雙層結構中。在雙層有機二極體數值分析模型中,包括有歐姆接觸,熱放射、穿透注入,空間電荷影響,場相依之移動率,缺陷效應及復合過程。
本論文之模型不只適用於模擬幾種參考文獻中的雙層結構(1-Naphdata/Alq3、TPD/Alq3)、且提出一些實驗數據與由此模型所得的結果比較,亦有滿意之結果。因此,經由本論文建立的模型,可應用在雙層元件的分析和最佳化製作。
The charge-carriers of the organic layers are one of the dominant factors to influence the performance of OLEDs. Thus, it is very important to study and understand the charge transporting behaviors in the organic layers of OLED. However, the organic materials show usually to have very high resistivity and very low carrier mobility, and then using general modeling techniques suitable for common semiconductors cannot conveniently simulate that.
First, a transporting model of the bilayer organic OLED are proposed in this dissertation, in which model were based on the current-voltage characteristics simulation proposed by Lampert and the continuous equation of current transport. The model contains a description of ohmic contacts, thermal emission and tunneling injection, space charge effects, trap effect, field dependent mobility and recombination processes. In addition, the method of Monte Carlo is a computational technique by using random numbers to compute an approximation to something whose exact value is difficult or impossible to compute, and that is used to simulate the bilayer organic OLED.
In this study, a numerical model proposed is successfully applied to describe the characteristics of the bilayer organic light-emitting diode. The model is satisfyingly demonstrated not only for applying to simulate several bilayer devices (1-Naphdata/Alq3、TPD/Alq3) reported but also for some devices obtained in our results. Finally, it can be extended to optimize the analysis and fabrication of bilayer devices.
目錄i
附表目錄iii
附圖目錄iv
第壹章 緒論.....................................1
1.1 前言......................................1
1.2 架構對OLED發光區域的影響..................4
1.3 有機與無機半導體的比較....................7
1.4 有機材料的特性............................8
1.4.1 高分子電激發光材料..................8
1.4.2 小分子OLED 與 高分子PLED............9
1.4.3 摻合/摻雜系統.......................10
1.4.3.1各種不同摻雜機制的結構.........13
1.4.3.2 染料摻雜的能量轉移機制.........13
1.4.4 單重態與三重態......................15
1.4.5 玻璃轉換溫度........................ 17
1.5 學習目的..................................18
第貳章 文獻回顧.........................................19
2.1 單層有機發光..............................20
2.1.1 電流................................20
2.1.2 轉換電壓..........................22
2.1.3 移動率............................23
2.2 金屬/有機界面...................................23
2.3 雙層有機發光....................................25
2.3.1 有機/有機層界面(Interface)......25
2.3.2 不連續跳躍之光發射途徑(機制)...........28
2.4 復合..............................................32
2.5 發光效率.........................................34
第參章 模型的建立與分析........................................36
3.1單層有機發光二極體.........................36
3.1.1 完整結構...........................36
3.1.2 無單位法...........................37
3.1.3 討論...............................44
3.2 雙層有機發光二極體........................46
3.2.1 理論基礎............................46
3.2.2 電流-電壓特性.......................46
3.3 探討及分析................................50
第肆章 結論..............................................53
第伍章 未來與展望.......................................55
附錄.......................................................56
參考文獻..................................................99
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