白光 LED 老化致藍光漏出與其抑制之研究

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姓名

楊上賦(Shang-Fu Yang) 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 LED 老化致藍光漏出與其抑制之研究
(The Study of Blue Leaking Blocker in Aged Phosphor Converted White LEDs)

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摘要(中)

在本論文中，為了解決白光 LED 在老化過程中，螢光粉因熱衰導致藍光漏出的問題，摻入了隨溫度變化而產生變色效果的感溫材料在 LED 封裝上，目的在螢光粉溫度過高時，能及時產生變色效果來吸收漏出的藍光。
在實驗中測試與分析多種不同的感溫材料，以及利用熱模擬來預測LED 內部溫度分佈，適當的修改找出最佳的感溫材料幾何外型及位置，並比較有無使用感溫材料的結果差異。

摘要(英)

In this thesis, we added the thermochromic materials into the pcW-LED to solve the blue light leakage during the pcW-LED aging process. The thermochromic materials could change their color and absorb the leaking blue light immediately when the temperature of the phosphor was too high.
Furthermore, to begin with, we measured and analyzed several different materials in the experiment. Also, we predicted the temperature distribution inside the LED by applying thermal simulation in order to find the best location and shapes of the materials. Finally, we compared the result of the LED which thermochromic materials was applied with the LED without thermochromic materials to see if there were significantly different.

關鍵字(中)

★ 白光發光二極體
★ 老化
★ 藍光漏出抑制
★ 感溫變色材料

關鍵字(英)

★ White LED
★ Aging
★ Blue light leakage blocker
★ Thermochromic materials

論文目次

摘要 I
Abstract II
致謝 III
目錄 V
圖索引 VIII
表索引 XIII
第一章　緒論 1
1-1　LED 發展背景 1
1-2　研究動機 5
1-3　論文大鋼 7
第二章　基本原理 8
2-1　引言 8
2-2　LED 發光原理 8
2-3 YAG:CE3+ 螢光粉原理 9
2-3-1　YAG:Ce3+ 能階結構 11
2-4　感溫材料變色原理 12
2-5　LED 熱效應之頻譜分析 14
2-5-1　藍光 LED 之熱效應 14
2-5-2　YAG 螢光粉之熱效應 17
第三章　LED 快速老化過程分析與實驗架構 19
3-1　前言 19
3-2　LED　壽命定義與量測 19
3-3　LED　加速老化漏藍光與半導體特性 21
3-4　加速老化實驗架構 24
3-5　LED 加速老化之熱模擬 25
第四章　螢光粉受熱藍光漏出之抑制方法與分析 28
4-1　前言 28
4-2　感溫變色材料介紹 28
4-2-1　感溫水性油墨120°C、150°C和170°C 28
4-2-2　聚乙烯吡咯烷酮 (Polyvinylpyrrolidone, PVP) 30
4-2-3　奈米纖維素材料 (Nanocellulose) 32
4-3　抑制藍光之封裝形式分析 34
4-3-1　將150°C 與 170°C 摻入 LED 之封裝 34
4-3-2　PVP 與 LED 之封裝 36
4-3-3　奈米纖維素材料 D 之 LED 封裝 42
4-3-4　奈米纖維素材料 A 之 LED 封裝 48
第五章　結論 56
參考文獻 58
中英名詞對照表 66

參考文獻

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指導教授

楊宗勳、孫慶成(Tsung-Hsun Yang Ching-Cherng Sun)

審核日期

2015-8-25

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