白光發光二極體色彩表現穩定技術之研究

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姓名

吳信美(Hsin-mei Wu) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

白光發光二極體色彩表現穩定技術之研究
(The study for stabilization of color performance of white LEDs)

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摘要(中)

本研究目的在於探討熱對藍光晶片搭配螢光粉之白光發光二極體（pc-LED）的影響，主要透過對一藍光晶片之輻射頻譜，其峰值波長在YAG的激發頻譜高峰左側，晶片受熱後，其輻射頻譜會紅移往YAG螢光粉之激發頻譜高峰靠近，如此會令更多藍光被 YAG激發出來，因此使轉換出來的黃光增加 ; 另一方面，螢光粉受熱會有熱衰現象，導致藍光被轉換之效率變低，這兩個因素相互作用的影響下，藉由評比色溫與色座標的漂移量降至最低、甚至幾乎不動，研究藍光晶片搭配YAG螢光粉能夠達到色彩穩定技術之條件，並透過實際封裝來進行分析與驗證。

摘要(英)

In this study, the thermal effects on LED color performance, such as CCT and chromaticity coordinate, were studied. As the temperature rises , the spectrum of bare chip will red shift that will let the efficiency increase or decrease. This phenomenon will be helpful to compensate the decay of the yellow light which results from thermal quenching, and it will achieve the stability of color performance.
The purpose of this study is to achieve the minimum deviation of CCT and color coordinate by combining the bare chip with specific peak wavelength and phosphor YAG. In the end, based on the result of packing, we analyzed and verified our hypothesis.

關鍵字(中)

★ 螢光粉
★ 色彩穩定
★ 波長紅移
★ 色座標飄移
★ 色溫飄移

關鍵字(英)

★ stabilization of color performance
★ chromaticity coordinates shift
★ CCT shift
★ peak wavelength shift
★ phosphor

論文目次

摘要 i
Abstract ii
致謝 iii
目次 v
圖次 vii
表次 x
第一章緒論 1
1.1 研究背景 1
1.2 研究動機與目的 5
1.3 論文大綱 7
第二章基本理論 8
2.1 色彩學 8
2.1.1 混光原理 8
2.1.2 色度座標 14
2.1.3 黑體輻射與色溫 17
2.2 LED發光原理 19
2.3 螢光粉發光原理 20
2.4 螢光粉的激發與輻射頻譜 22
第三章熱影響色彩表現穩定性之因素 23
3.1 激發能力之計算 23
3.2 熱對藍光頻譜的影響 26
3.3 熱對螢光粉頻譜的影響 29
第四章藍光LED 搭配 YAG 螢光粉色彩表現之實驗分析 33
4.1 白光LED 色彩穩定初步假設與構想 33
4.2實驗流程與架構 35
4.3封裝同濃度螢光粉的白光LED 驗證 39
4.4白光LED 的色彩表現分析 43
第五章結論 50
參考文獻 52
中英文名詞對照表 56

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指導教授

楊宗勳、孫慶成
(Tsung-hsun Yang、Ching-cherng Sun)

審核日期

2011-7-18

推文