矽酸鹽螢光粉之量子效率量測與精確光學模型

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姓名

沈宜佳(I-Chia Shen) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

矽酸鹽螢光粉之量子效率量測與精確光學模型
(Measurement of Quantum Efficiency of Silicate phosphors for Precise Optical Modeling)

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摘要(中)

採用螢光粉封裝之白光LED，除了會隨著不同的封裝形式，有著不同的光學特性外，不同種類的螢光粉，亦有不同的轉換效率，對白光LED的發光效率有直接影響，所以，對於螢光粉模型與其轉換效率之研究是一個相當重要的課題。本論文中，為了得到較精確的螢光粉轉換效率，我們改良了傳統實驗架構，因此，提高轉換效率分析上的準確性。另外，為了探討矽酸鹽（Silicate）螢光粉於白光LED封裝之光學特性，我們建立矽酸鹽螢光粉的光學模型，再將模型中得到之轉換效率與實驗量測結果做比較。

摘要(英)

As well known, in addition to the ways of packaging, the conversion efficiency of the various applied phosphors also has greatly effect on the luminous efficiency in the phosphor-based white light LEDs. In such a way, it has become a very important issue that how to evaluate the quantum efficiency of phosphors. In this thesis, we has proposed an improved measuring setup for obtain the precise quantum efficiency of phosphors. The accuracy of the measurement has much enhanced in analysis. Besides, we also study the optical model to precisely describe the spatial and the chromatic distribution of the lights emitted from blue LEDs covered with silicate phosphors.

關鍵字(中)

★ 量子轉換效率
★ 矽酸鹽
★ 螢光粉
★ 發光二極體

關鍵字(英)

★ quantum efficiency
★ silicate
★ YAG
★ phosphors
★ LED

論文目次

摘要 i
Abstract ii
致謝 iii
目錄 v
圖目錄 vii
表目錄 x
第一章緒論 1
1.1 LED背景 1
1.2 研究動機與目的 5
1.3 論文大綱 6
第二章基本原理 7
2.1 引言 7
2.2 LED發光原理 7
2.3 螢光材料特性 9
2.3.1 螢光材料之激發與輻射光譜 11
2.3.2 螢光材料之轉換效率 13
2.3.2.1 史托克轉換效率 13
2.3.2.2 量子效率 13
2.3.2.3 光散射轉換效率 14
2.3.3 螢光材料之安定性 15
第三章 YAG螢光粉量子轉換效率之量測 16
3.1 引言 16
3.2 實驗儀器與設備 16
3.3 螢光粉量子轉換效率量測之傳統架構 19
3.4 螢光粉量子轉換效率之改良架構 22
3.5 量測結果與分析 27
第四章 Silicate螢光粉等效光學模型之建立 47
4.1 引言 47
4.2 螢光粉散射模型 48
4.3 螢光粉吸收參數 57
4.4 螢光粉轉換效率 64
4.5 螢光粉模型之轉換效率與量測結果之分析 65
第五章結論 69
參考文獻 71
中英文名詞對照表 74

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指導教授

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

審核日期

2009-7-27

推文