有機發光二極體之溫度效應模擬與分析

The Study of Temperature Dependence of Electrical Characteristics of Organic Light-Emitting Diodes by Simulation

張嘉修(Chia-Hsiu Chang)

指導教授 ： 蔡裕勝

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(2014年)

摘要

本研究以 Matlab 軟體模擬電特性曲線來符合、趨近於實驗所取得的電特性曲線；由於現在製程一個完整元件所消耗的能源以及環境影響都是不容忽視的，隨著現代講求能源的節省以及環境的保護觀念；所以以模擬的方式來對有機發光二極體的元件結構做出模擬來取得其電特性既省時又省成本，實驗是以NPB、Alq3材料來做實驗與模擬的特性比較；元件結構為：ITO /NPB (40 nm)/Alq3 (60 nm)/LiF/Al，裸片最高的發光效率為3.5 cd/A@20mA，最大亮度為1600 cd/m2 @ 9V。
在實驗與模擬發現，模擬出來的圖形與實驗出來的電壓與電流密度的曲線有些差異，所以對模擬的公式上做了些改變，發現對於溫度變化時所呈現出來的模擬曲線會較符合實驗曲線，所以從溫度變化這方面開始做研究與分析，在特線曲線上能發現1 ~ 4 V時因為還未克服能障關係所以電流密度值很低，在4 ~ 10 V 克服能障關係又因為能量與溫度成正比關係， 因此在加入溫度變化後能使模擬曲線更符合實驗曲線。

關鍵字

有機發光二極體 ； 模擬 ； 溫度 ； 空間電荷限制電流 ； 注入電荷限制電流

並列摘要

This study uses Matlab software to meet the electrical characteristics, simulation curves approaching electrical characteristics curves are obtained in experiment; the consumption now process a complete element energy and environmental impact can not be ignored, with the modern emphasis on saving energy and environmental protection concept; so to simulate the way to element structure the organic light emitting diodes to make the simulation to get its electrical properties of both time and cost, the experiment is to do experiments and simulation with NPB, Alq3 materials; element structure: ITO /NPB (40 nm) /Alq3 (60 nm) / LiF/Al, die maximum luminous efficiency of 3.5 cd/A@20mA, the maximum the brightness of 1600 cd/m2 @ 9V.
Found in experiment and simulation, some differences from the simulation graphics and experiment of voltage and current density curve, so the simulated formula made some changes, it was found that the simulation curves on the temperature changes will be more in line with the experimental curve, so the temperature changes that began to do research and analysis, the curve can be found in 1 ~ 4 V because have not overcome the energy barrier between the current density value is very low, in 4 ~ 10 V to overcome the energy barrier and because the energy is proportional to the temperature, so temperature changes in addition to make the simulation curve with the experimental curve.

並列關鍵字

Organic Light-Emitting Diodes ； Simulate ； Temperature ； Space-charge-limited-current ； Injection-charge-limited-current

參考文獻

[1] C. W. Tang, and S. A. VanSlyke, "Organic electroluminescent diodes," Appl.Phys. Lett. 51, 913 ,1987.

[4] D. A. Neamen, Semiconductor Physics & Devices, 2nd Ed. ,p. 319.

[9] Y. He, and J. Kanicki, Appl. Phys. Lett. 76, 661 ,2000.

[15] 蔡其叡, "有機電致發光元件之載子傳輸機制研究," 國立成功大學電機工程研究所碩士論文 ，2004.

[18] S. Karg, M. Meier, and W. Riess, Appl. Phys. Lett. 82, 1951 ,1997.