臺灣博碩士論文加值系統

在本論文中，我們使用蒙地卡羅光線追跡法建立出LED之光子循環效應的光學模型，並探討在不同的主動層吸收係數之條件下，光子循環效應對於GaN LED和AlGaInP LED之光萃取效率的影響。此外，我們更進一步地選取了表面結構之薄型氮化鎵和圖案式藍寶石基板兩種GaN LED結構，分析當微結構陣列之角錐的角度改變時，其對於晶片之指向性和光萃取效率的提升幅度。

In this thesis, we build the optical model for photon recycling effect of LEDs based on Monte Carlo ray tracing method. According to this model, under different absorption coefficients of the active layer, we analyze the light extraction efficiency with respect to GaN and AlGaInP LEDs. Furthermore, we select two kinds of GaN LED structures such as surface texture of ThinGaN LEDs and patterned substrate of sapphire-based LEDs. Based on these two structures, we analyze the enhancement of the directionality and the light extraction efficiency when the slanted angles of the pyramid array are different.

摘要 I
Abstract II
致謝 III
目錄 IV
圖索引 VII
表索引 XIII
第一章 緒論 1
1-1 前言 1
1-2 LED的發展 1
1-3 研究動機 5
1-4 論文大綱 6
第二章 LED之光學特性 7
2-1 LED發光原理 7
2-2 LED發光效率與量子效率 10
2-1-1 LED內部量子效率 12
2-2-2 LED光萃取效率 15
2-3 LED光萃取效率之提升方法 19
2-4 LED之指向性 30
第三章 LED光學模型的建立 34
3-1 蒙地卡羅光線追跡法 34
3-2 LED光學模型與模擬參數 35
3-3 主動層吸收與光子循環效應 40
第四章 LED光萃取效率及指向性之研究與分析 44
4-1 光子循環效應對LED之光萃取效率的影響 44
4-1-1 氮化鎵LED之光萃取效率分析 44
4-1-2 磷化鋁鎵銦LED之光萃取效率分析 49
4-1-3 結論 58
4-2 晶片微結構對氮化鎵LED指向性之影響 60
4-2-1 表面結構之薄型LED指向性分析 60
4-2-2 圖案式基板LED指向性分析 72
4-2-3 結論 84
第五章 結論 86
參考文獻 88
中英文名詞對照表 93

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