利用二維光子晶體提升氮化鎵發光二極體發光效率之模擬與分析

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姓名

杜福安(Fu-an Du) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

利用二維光子晶體提升氮化鎵發光二極體發光效率之模擬與分析
(Study of the light efficiency from GaN light-emitting diodes with two-dimensional photonic crystal)

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摘要(中)

摘要
本研究主要在探討如何利用二維光子晶體提升氮化鎵二極體發光效率。論文中描述提升發光效率機制有二個：一為利用表面週期性結構造成布拉格散射，以減少全內反射情形發生；第二個則是利用光子晶體能隙將傳導模態導引出來，以提升外部量子效率。除此之外，當製作光子晶體時對材料的破壞會造成實際發光面積減少與非輻射複合效應增加。將此兩項效應對總發光效率的影響作討論，以及分析利用共振腔結構提升自發性輻射機率對總發光效率之影響。從上述分析結果建立一套簡易模擬模型描述光子晶體發光二極體之發光效率性質。

摘要(英)

Abstract
In this research, we study the light extraction characteristics in photonic crystal slab structures and report the enhancement results. There are two mechanisms for improved LED output power, the first is using the Bragg scattering to enhance the output efficiency by photonic crystal surface patterned and it can avoid the internal reflection probability to occur. The second mechanism is permitting the guided mode to the escape the LED slab by the photonic crystal band gap structure. Besides it, we consider the reduced emitting area and non-radiative recombination effect when photonic crystal structure inset the LED device. We also consider the resonant structure which induced the Purcell effect, and it can enhance the spontaneous emission rate. Finally, we set up a model that can describe the light characteristics in the photonic crystal LED structure.

關鍵字(中)

★ 光萃取
★ 發光二極體
★ 光子晶體

關鍵字(英)

★ lught extraction
★ light-emitting diodes
★ photonic crystal

論文目次

目錄
摘要 ........................................................................Ⅰ
誌謝 ....................................................................... Ⅲ
目錄 ........................................................................Ⅳ
第一章導論 ...............................................................1
1-1 引言 .................................................................1
1-2 研究動機與目的 .......................................................3
第二章基本理論 ...........................................................4
2-1 光子晶體能帶結構 .....................................................4
2-2 光子晶體能隙 .........................................................8
2-3 光子晶體與發光二極體發光效率.........................................11
第三章模擬結果特性分析 ..................................................14
3-1 模擬架構 ............................................................14
3-2 模擬結果特性與分析 ..................................................15
3-2.1 發光效率對頻率關係 ............................................15
3-2.2 發光效率對空氣柱大小關係 ......................................21
3-2.3 發光效率對空氣柱深度關係 ......................................26
3-2.5 發光效率對光源位置關係 ........................................28
3-3 本章總結 ............................................................30
第四章光子晶體LED發光效率之分析與討論 ...................................31
4-1 總發光功率之計算 ....................................................31
4-2 非輻射複合效應 ......................................................38
4-3 Purcell效應 ........................................................43
4-4 布拉格散射效應 ......................................................50
第五章結論 ..............................................................54
參考文獻 ....................................................................56
附錄 ........................................................................59

參考文獻

參考文獻
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指導教授

綦振瀛(Jen-Inn Chyi)

審核日期

2006-7-23

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