有機發光二極體之載子傳輸電特性研究

Study on Carriers Transport Electrical Characteristics in Organic Light-Emitting Diode

楊政樺(Jeng-Hauh Yang)

指導教授 ： 莊賦祥

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2012年)

摘要

有機發光二極體在許多方面有極佳的優勢，但是目前尚有許多問題待研究改善，理論的模擬將有助於實驗的發展。
本文分兩種模型討論，以 Matlab 軟體程式模擬比較有機發光二極體在不同的單載子元件結構及雙層元件結構，其電流密度與電壓之電性曲線。所討論之二種模型分別為：
1.空間電荷限制電流 ( Space-charge-limited-current,以下簡稱 SCLC )
，考慮電場與溫度相依的載子移動率及考慮缺陷分佈存在之影響。
2.注入電荷限制電流( Injection-charge-limited-current,以下簡稱 ICLC )
，考慮電場影響之 Poole-Frenkel 效應及電場與溫度相依的載子移
動率。
在不同的厚度、溫度等參數下，以此二種模型來模擬分析 NPB 單載子電洞元件（hole-only device）及 Alq3 單載子電子元件（electron-only device），將其結果與實驗數據做比較，以求得各項變數的近似參數，再將我們得到的參數帶入雙層元件中進行模擬。有機材料配合不同的電極和在不同的溫度下有不同的電性曲線，藉由本文探討其元件結構之模型模擬的適用性及 J(V) 曲線之變化。
關鍵詞：空間電荷限制電流，注入電荷限制電流，Poole-Frenkel 效應，缺
陷，載子移動率。

關鍵字

空間電荷限制電流 ； 注入電荷限制電流 ； Poole-Frenkel 效應 ； 缺陷 ； 載子移動率

並列摘要

Organic light-emitting diode has excellent advantages in many ways, but there were still many problems to be studied and be resolved. The theoretic simulation could aid experiment development.
This paper discussed two types of models, we use Matlab to simulate and compare the electric density –voltage curve of organic light-emitting diodes in different single and double layer structures. The two kinds of models discussed were:
1. Space-charge-limited-current, or SCLC, considering the electric field and temperature dependence of carrier mobility, and the affection of the trap distribution.
2. Injection-charge-limited-current, or ICLC, considering the electric field and temperature dependence of carrier mobility, and the affection of the electric field of the Poole-Frenkel effect.
In different parameters, such as thickness and temperature, we use those 2 models to simulate and analyze NPB hole-only device and Alq3 electron-only device, Then we compare the simulated results with experimental data to obtain the approximations of each variable. We got these parameters into the double-layer component simulation. Organic materials have different electrical curves with different electrodes and at different temperatures. This paper discusses the structure of its components by the model simulation of the applicability and J (V) curve of the change.

並列關鍵字

SCLC ； ICLC ； Poole-Frenkel effect ； trap ； mobility

參考文獻

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