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研究生:葉志偉
研究生(外文):Chihwei Yeh
論文名稱:螢光粉物理性質對白光發光二極體光電特性影響之研究
論文名稱(外文):The Effect of Physical Feature of Phosphor to the White Light LED Optoelectronic Characteristics
指導教授:龔吉和
指導教授(外文):Kung,Jiho
口試委員:吳國梅林奇鋒龔吉和
口試委員(外文):Chi-Feng Lin Kung,Jiho
口試日期:2012-07-23
學位類別:碩士
校院名稱:國立聯合大學
系所名稱:LED光電製程產業專班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:81
中文關鍵詞:螢光粉粒徑
外文關鍵詞:phosphorparticle size
相關次數:
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本研究利用藍光晶片發光並激發塗佈在藍光晶片上之黃色螢光粉,被激發出的黃光混合藍光而產出白光,以此生產模式來進行後續實驗。實驗利用研磨與超音波震盪方式來進行螢光粉處理,研究發現,使用研磨方式進行螢光粉處理,雖可使團簇現象降低,但因外力作用使螢光粉表面產生缺陷,使其亮度、效率與演色性降低,而使用超音波震盪成功將7 μm之螢光粉的團簇現象降低,使其粒徑尺寸可較均勻化,且螢光粉亮度、效率與演色性可保有原本特性。實驗將比較研磨與超音波震盪處理後螢光粉在光性方面的表現。
利用掃描式電子顯微鏡進行螢光粉表面分析,研究發現,經研磨與超音波震盪後7 μm之螢光粉團簇現象可大幅降低。研究中發現,7 μm之螢光粉經超音波震盪與研磨20 min展現最較佳的色溫座標標準差δX,因研磨20 min螢光粉會發生效率變差的現象,故本研究挑選超音波震盪後7 μm之螢光粉進行最後成品封裝,封裝後量測光性,發現其色溫座標可有效被控制,且δX亦相較於研磨與大粒徑之螢光粉有較佳的集中性,其客需良品率可達100 %。
關鍵詞:螢光粉、粒徑。

In this study, we demonstrated the white light LED by introducing the yellow phosphor on the blue light LED chip. The yellow phosphor was excited by the blue light of LED chip and the white light was generated with the mixture of blue and yellow light. Two methods, grind and ultra-sonic sieving, were used to process the phosphor and the optical characteristics of the phosphor after processing were compared and discussed.
We found that the nanoclusters of the phosphor were smaller and more uniform after the grinding process. However, the damage of the phosphor with grinding process caused the surface defects and resulted in lower illumination efficiency and color rendering index (CRI). Contrary, with the ultrasonic sieving method, the particle size of the phosphor with the diameter of 7 m could become more uniform and the optical properties were almost the same as the phosphor without any treatment.
Moreover, particle size of the phosphor after various processes was confirmed by scanning electron microscope (SEM). We found that the nanoclusters were greatly reduced and the particle size of the phosphor became more uniform after both grinding and ultrasonic sieving methods. After processing, the phosphor with the diameter of 7 m shown fewer shifts on the color temperature coordinate δX. Owing to the degradation of the optical characteristics of the phosphor processed with grinding method, we finally choose the ultrasonic sieving method for final product assembly. It was found that color temperature coordinated can be effectively controlled and the shift of δX was less than the phosphor with large diameter and grinding process. Finally the yield rate could improve to 100%.
Key words : phosphor, particle size, grinding, ultrasonic sieving

總目錄
誌謝 I
中文摘要 II
Abstract III
總目錄 IV
圖目錄 VI
表目錄 IX
第一章、緒論及研究動機 1
1.1 發光二極體LED概論 1
1.2 研究動機 3
第二章、文獻回顧 9
2.1 LED起源簡介 9
2.1.1 發光二極體 (LED) 9
2.1.2 LED封裝 12
2.2 螢光粉 13
2.2.1 YAG 【17】 13
第三章、實驗方法 21
3.1 LED封裝 21
3.1.1 樣品製作與分析 21
3.1.2 提升螢光粉粒徑均勻性 22
3.2分析與量測技術 22
3.2.1角度機量測光形變化 22
3.2.2 掃描式電子顯微鏡 (Scanning Electron Microscope) 23
3.2.3螢光材料快速分析系統(MegaLED Fluo) 24
3.2.4 螢光粉中心粒徑量測 24
3.2.5 IS標準機 24
第四章、實驗結果與討論 31
4.1理論線繪製 31
4.2 SEM分析 32
4.2.1 大、小粒徑螢光粉SEM分析 32
4.2.2 研磨製程 32
4.2.3 超音波震盪 33
4.3 中心粒徑 (d50)量測 33
4.4 螢光粉效率量測 34
4.5 光形量測與分析 35
4.6 標準差量測 35
4.7 沉澱實驗 36
4.7.1 沉澱對成品亮度 (Iv)與演色性 (CRI)之影響 36
4.7.2 沉澱對各實驗參數之色溫座標的影響 38
4.8 晶片波長對色溫座標集中性影響 40
4.9 成品封裝測試 40
4.9.1 標準差量測 41
第五章、結論 67
第六章、未來研究方向 69
參考文獻 70



參考文獻
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