白光LED之螢光粉熱衰探討

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姓名

劉瑋瑋(Wei-Wei Liu) 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之螢光粉熱衰探討
(Thermal effect on phosphors applied in LEDs)

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摘要(中)

在本論文中，為了解現今白光LEDs於正常驅動下，晶片產生的熱對螢光粉造成的效應，於是我們建立了一套螢光粉熱衰的光學量測架構與流程，且對實驗架構進行公差分析，將此系統對目前白光LEDs常用的螢光粉體進行熱衰研究，實驗中除了探討螢光粉遇熱時的頻譜變化及出光效率的改變外，亦對螢光粉熱衰行為，進行濃度、厚度與粒子數的實驗與分析，以數據化的方式呈現結果。期待在未來能將螢光粉熱衰行為運用來預測LEDs的整體光學行為，並提供準確的數據和建議。

摘要(英)

The heat was inevitably generated from chips when light-emitting diodes (LEDs) were driven at working current. The quantity of heat affects the characteristic of phosphors. This thesis devoted to study the thermal effect on different kinds of phosphors that are commonly used in LEDs. This study establish an experimental setup and procedures which was analyzed its tolerance to derive this phenomenon. Except for measuring the shift in spectrum and thermal degradation in phosphors, this study also vary distinct parameters such as concentration, thickness, and particle numbers to study the correlation between the optical properties. It is possible to anticipate the optical performance when combining the luminescent behaviour of phosphor under thermal aging to provide accurate proposition in the future.

關鍵字(中)

★ 熱衰
★ 螢光粉
★ 發光二極體

關鍵字(英)

★ LED
★ Phosphor
★ Thermal Effect

論文目次

摘要..................................................................................................................i
英文摘要.........................................................................................................ii
致謝................................................................................................................iii
目錄................................................................................................................v
圖索引............................................................................................................ix
表索引..........................................................................................................xiv
第一章緒論...............................................................................................1
1.1 前言......................................................................................................1
1.2 LED背景..............................................................................................2
1.3 研究動機與目的..................................................................................6
1.4 研究大綱............................................................................................10
第二章基本原理.....................................................................................11
2.1 引言....................................................................................................11
2.2 螢光粉材料特性及發光行為................................................................11
2.2.1 YAG螢光粉................................................................................15
2.2.2 Silicate螢光粉.............................................................................16
2.2.3 Nitride螢光粉..............................................................................17
2.3 螢光粉轉換效率....................................................................................18
2.4 螢光粉熱衰............................................................................................19
2.5 色彩簡介................................................................................................20
2.5.1CIE色度系統................................................................................21
2.5.2 色溫.............................................................................................22
第三章螢光粉熱衰量測架構建立.........................................................24
3.1 引言....................................................................................................24
3.2 螢光片製作參數................................................................................24
3.3 熱電偶................................................................................................28
3.4 加熱系統............................................................................................29
3.5 實驗架構設置....................................................................................33
3.6 公差分析............................................................................................34
3.6.1 雷射穩定度分析.........................................................................34
3.6.2 加熱系統誤差分析.....................................................................35
3.6.3 螢光片對位誤差分析.................................................................40
第四章螢光粉熱衰.................................................................................45
4.1 引言....................................................................................................45
4.2 黃光熱衰分析....................................................................................45
4.2.1 頻譜變化.....................................................................................46
4.2.2 色座標位移.................................................................................51
4.2.3 發光強度下降.............................................................................52
4.3 粒子數對熱衰影響............................................................................59
4.4 厚度對熱衰影響................................................................................60
4.5藍光吸收減少效應.............................................................................65
第五章結論.............................................................................................71
參考文獻.......................................................................................................74
中英文名詞對照表.......................................................................................80

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指導教授

孫慶成(Ching-Cherng Sun)

審核日期

2011-7-18

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