高指向性LED外腔式光源機構之研究｜國立中央大學博碩士論文系統

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研究生：	楊双豪 Shuang-hao Yang
論文名稱：	高指向性LED外腔式光源機構之研究 Study of High-Directional LED with External Cavity
指導教授：	孫慶成 Ching-Cherng Sun
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 光電科學與工程學系 Department of Optics and Photonics
畢業學年度：	98
語文別：	中文
論文頁數：	102
中文關鍵詞：	光展量、耦合效率、光子回收、薄膜型氮化鎵LED 、表面結構
外文關鍵詞：	Étendue, Coupling Efficiency, Photon Recycle, ThinGaN LED, Surface Texture
相關次數：	點閱：8 下載：0
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本研究中，我們利用具有表面微結構之薄膜型氮化鎵LED搭配外腔式光源機構，設計出高指向性之光源機構模型。首先，針對氮化鎵LED的幾何結構以及光學特性進行量測，並經由此實驗數據建立出相似度高達99.8%的LED光學模型。接著利用此模型設計一外腔式光源機構，使LED的光線發散角得以從±90°縮小至±30°以內，並計算出光耦合效率、能量提升比例以及散角分佈。最後，我們將此光源機構的實驗數據與模擬結果一一進行比較與探討，進而得到一高精準度之外腔式光源機構模型，而此模型也有利於之後進一步優化的設計。

In this thesis, we incorporate an external cavity with the surface texture for ThinGaN LEDs to obtain a high-directional light source. First of all, we measure the geometric structure on the top surface of ThinGaN LEDs and the characteristic of optical parameters. According to the information, we build up a precise optical model of ThinGaN LED to design an external cavity with special light cone of 30°, which is different from 90° of general LEDs. The output coupling efficiency, enhancement ratio, and spatial distribution are analyzed. Finally, we compare the experiment results with the simulation, and the characteristic of the new light source is discussed.

摘要 ........................................................................................................................ I
目錄 ..................................................................................................................... IV
圖索引 ................................................................................................................ VII
表索引 ................................................................................................................ XII
第一章 緒論 ...................................................................................................... 1
1-1 前言 ...................................................................................................... 1
1-2 LED 的發展概況 ................................................................................. 2
1-3 LED 於高指向性光源之應用 ............................................................. 5
1-4 論文大綱 .............................................................................................. 7
第二章 基本原理介紹 ......................................................................................... 8
2-1 LED 發光原理 ..................................................................................... 8
2-2 LED 發光效率 ................................................................................... 11
2-2-1 LED 內部量子效率................................................................. 13
2-2-2 LED 光萃取效率 ..................................................................... 15
2-3 薄膜型LED 發光效率之提升 .......................................................... 19
2-4 LED 之指向性 ................................................................................... 23
V
第三章 高指向性LED 光源模型的建立 ......................................................... 28
3-1 光子回收機制之先前技術 ................................................................ 28
3-2 高指向性光源機構之設計概念 ........................................................ 29
3-3 ThinGaN LED 光學模型之建立與驗證 ........................................... 32
3-3-1 蒙地卡羅光線追跡法 ............................................................. 32
3-3-2 ThinGaN LED 光學模型與模擬參數 ................................... 34
3-3-3 ThinGaN LED 表面微結構之建立 ....................................... 36
3-3-4 光學模型驗證 ......................................................................... 40
第四章 高指向性光源機構之設計 ................................................................... 44
4-1 初階設計與模擬參數 ......................................................................... 44
4-2 初階設計之分析與實作 .................................................................... 47
4-2-1 肉厚對反射杯之影響 ............................................................. 47
4-2-2 反射杯之模型設計 ................................................................. 53
4-2-3 出光耦合效率、能量提昇率和散角分佈圖 ......................... 56
4-3 反射杯之反射率量測 ........................................................................ 70
4-4 反射杯之散射效應 ............................................................................ 75
VI
第五章 結論 ....................................................................................................... 82
參考文獻 ............................................................................................................. 84
中英文名詞對照表 ....................................................................................... 87

                                

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