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研究生： 陳仙瑋
Sian-Wei Chen
論文名稱： 高演色性白光發光二極體封裝
Package of White-Light LED with High Color Rendering Index
指導教授： 蘇忠傑
Jung-Chieh, Su
口試委員: 陳敬恒
Jing-Heng Chen
趙良君
Liang-Chiun Chao
林保宏
Pao-hung Lin
學位類別： 碩士
Master
系所名稱： 電資學院 - 光電工程研究所
Graduate Institute of Electro-Optical Engineering
論文出版年： 2008
畢業學年度： 96
語文別： 中文
論文頁數： 78
中文關鍵詞： 白光發光二極體 、演色性 、全方位反射器
外文關鍵詞： white light LED, color rendering index, omnidirectional reflector
相關次數： 點閱：338  下載：8 
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    • 近年來白光發光二極體(LED)已經成為未來照明光源新星。以藍光發光二極體激發黃色螢光粉的白光LED，因為演色性只能到達80左右，由於這個缺點如果想要用它來取代現有室內照明是不夠具有吸引性的。為了能夠達到高演色性的白光LED，本文提出使用波長在380 nm的紫外光發光二極體(UV-LED)激發一個新的螢光粉配方，並且與標準光源做比較。使用UV-LED激發紅藍綠三色螢光粉時，由於螢光粉的轉換特性導致所產生的白光LED演色性不高；另一方面使用藍光LED激發黃色YAG螢光粉有高轉換效率的優點。本文結合了這兩個要素提出使用UV-LED激發藍黃紅三色螢光粉，以達到演色性高於90，色座標接近理想白點的白光光源。使用紫外光發光二極體時會碰到另一個問題－紫外光的外漏－本文使用光子晶體又名全方位反射器完全能隙的概念，將一維光子晶體鍍膜片加入封裝結構中，達到將380 nm紫外光在任意入射角時全反射的功能。並且研究不同封裝結構對發光效率影響。使用光子晶體封裝不僅能防止紫外光外漏，還能提升發光效率。這一個新的白光結構在全方位反射器與螢光膠層存在一空氣層時會有最高的發光效率。利用這種封裝結構本研究能夠達到在色座標為 (0.319, 0.320) 時，CCT=6188K，Ra=93.7，發光效率9.5 lm/W的白光LED。由實驗結果得到，藉由控制螢光膠層的配方與濃度，就算不是使用高效率的紅藍綠螢光粉也可以達到高演色性的白光光源。

    Although white-light light emitting diode (LED) has become a main goal for the new generation of illumination light source in the recent years, the color rendering index (CRI) for the blue LED chips excited yellow phosphors is around 80, and that falls short of the future lighting applications such as the street lighting. In order to achieve high CRI for white-light LEDs, we proposed a new phosphors blend for excitation using ultra violet LED (UV-LED) chips with wavelength around 380 nm, and compared the resultant light source with standard light source. Since the conversion characteristic of commercially available UV excited RGB phosphors may result in a low CRI white light source; on the other hand, use blue LED chips excited YAG based yellow phosphors has high conversion efficiency. We combined the characteristics of these phosphors to achieve phosphors conversion spectra with CRI above 90, the color coordinate approximates to the ideal white point. But we faced another problem “the leakage of UV light”. We use the full band gap idea of the photonic crystal (PhC.) or omni-directional reflector (ODR) by packaging the ODR with the conventional white-light LED. As a result of the UV beams can be omni-directionally reflected at any incidence. In this study the luminous efficiency of different package structures of ODR are also proposed. The ODR package will enhance the white light generation and prevent UV leak from the device. This novel white LED is constructed with an air gap between the phosphors layer and the ODR lead to the highest luminous efficiency. Specifically, the color coordinate for the light source made is (0.319, 0.320), the CRI has a value of 93.7, the correlated color temperature is 6188K and the luminous efficiency is 9.5 lm/W. The experimental data shows that a high CRI light source can be achieved without high quality RGB phosphors, by controlling the composition and concentration of phosphors blend layer.

    摘要 I 致謝 V 目錄 VI 圖目錄 VIII 表目錄 X 第一章 前言 1 1.1 白光發光二極體種類 1 1.1.1 不同色光LEDs 混光 1 1.1.2 藍光LED激發有色螢光粉 2 1.1.3 紫外光LED激發有色螢光粉 3 1.2 發光二極體晶片發光效率提升的方法 4 1.2.1 大功率LED 4 1.2.2 LED 表面粗化 4 1.2.3 LED 形狀改變 5 1.2.4 覆晶式LED 6 第二章 研究目的與方法 8 2.1 研究目的 8 2.2 研究方法 9 2.2.1 色度學 9 2.2.1.1 色座標圖 9 2.2.1.2 色差計算 13 2.2.1.3 色溫與相關色溫 15 2.2.1.4 演色性 17 2.2.2 光度學 19 2.2.2.1 光強度 19 2.2.2.2 光通量 20 2.2.2.3 照度 20 2.2.2.4 輝度 21 2.3 量測方法與儀器介紹 22 2.3.1 積分球與I-V電性量測 22 2.3.2 光場分布量測 24 2.3.2.1 全方位反射器量測 25 2.3.2.2 LED量測 26 2.4 螢光粉材料成分與發射光谱 27 2.4.1 紅色螢光粉 28 2.4.2 綠色螢光粉 29 2.4.3 藍色螢光粉 30 2.4.4 黃色螢光粉 31 2.5 田口式實驗設計法 31 2.5.1 田口式實驗法 31 2.5.2 RGB白光發光二極體之CIE色座標調製 33 2.5.3 RBY白光發光二極體之CIE色座標調製 37 2.6 光學設計 39 2.6.1 全方位反射器原理 39 2.6.2 全方位反射器設計 40 2.7 提升UV激發白光發光二極體效率 43 2.7.1 螢光粉配方 43 2.7.2 濃度與厚度關係 45 2.7.3 封裝結構 46 第三章 實驗結果分析與討論 49 3.1 螢光材料與發光效率的關係 49 3.1.1 螢光粉材料成分與配方 49 3.1.2 濃度影響 50 3.1.3 光場與光譜分布量測 52 3.2 全方位反射器穿透光譜量測 56 3.3 封裝結構與發光效率關係 58 3.3.1 以全方位反射器封裝與一般封裝結構比較 58 3.3.2 光場與色溫分布比較 61 3.4 發光品質與規格 64 3.4.1 CIE色座標、色溫、演色性與光譜特性 64 3.4.2 L-I-V特性 67 第四章 結論與建議 68 4.1 結論 68 4.2 未來發展方向 69 參考資料 70 附錄1.1 CIE 1974 色彩測試樣品(CIE1974 Test-Color Samples)頻譜反射率Ri(λ)編號1-8，用來計算演色性指數(Color Rendering Index)。(after CIE, 1995) 73 附錄1.2 CIE 1974 色彩測試樣品(Test Color Samples)光譜反射率Ri(λ)，編號9-14。(after CIE, 1995) 76

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