臺灣博碩士論文加值系統

鈰摻雜之釔鋁石榴石(Cerium doped yttrium aluminum garnet, YAG:Ce)螢光粉為現今最具應用之螢光粉材料，透過噴霧乾燥法方式，進行連續式螢光粉生產之研究，本實驗透過添加具有羧基(-COO-)之有機酸進行前驅物溶液改質，利用金屬離子與羧基錯合程度及有機酸燃燒熱差異，達到控制噴霧乾燥之粉體形貌、晶粒大小、粒徑分佈及螢光性質目的。
此研究分別添加具備一對羧基之甲酸、二對羧基之草酸及三對羧基之檸檬酸於前驅物溶液中，透過甲酸、草酸及檸檬酸具備之不同羧基(-COO-)數量對於金屬離子進行錯合反應，控制噴霧乾燥粉體之形貌為光滑球體、表面凹陷球體及皺褶球體，使經一階段噴霧乾燥粉體於空氣下進行1300 ℃煆燒程序，生成鈰摻雜之釔鋁石榴石螢光粉；粉體藉由X光晶體繞射分析儀(XRD)進行晶相鑑定及透過Scherrer 方程式進行晶粒大小之運算、傅立葉轉換紅外線光譜(FTIR)進行粉體之官能基鑑定、聚焦離子束顯微系統(FIB)進行粉體之截面分析、場發射穿透式電子顯微鏡(FE-TEM) 進行粉體之形貌分析、螢光光譜儀(PL)進行之光致螢光性質分析。

The potential phosphor particles of Ce-doped yttrium aluminum garnet (YAG) have been prepared using spray drying. Spray drying offers the advantage of homogenous particles and regular shape comparing to the common method of solid state reaction. It is well known that the acids plays the important role on the particle shape for the spray dried powders. So, three common acids of formic acid, oxalic acid, and citric acid were used to prepare Ce-doped YAG powders. The citric acid-treated powder exhibits the highest photoluminescence intensity than the formic acid and oxalic acid-treated powders because it exhibits the smoother surface than that of the formic acid and oxalic acid-treated powders. In addition, the formation mechanisms of various Ce-doped YAG powders were discussed.

摘要 I
Abstract II
第一章 緒論 1
第二章 文獻回顧 3
2.1釔鋁石榴石晶體結構 3
2.1.1 發光機制 4
2.1.2 釔鋁石榴石物理性質 8
2.2 釔鋁石榴石應用 9
2.2.1 陰極射線管(Cathode ray tube) 9
2.2.2 固態雷射(Solid state laser) 10
2.2.3 發光二極體 (Light emitting diode) 11
2.2.4白光發光二極體(White light emitting diode) 13
2.3 釔鋁石榴石粉末製程 14
2.3.1固態反應合成法(Solid-state reaction) 14
2.3.2化學共沉澱法(Co-precipitation method) 16
2.3.3水熱/溶劑熱合成法(Hydro/Solvothermal method) 18
2.3.4噴霧熱裂解法(Spray pyrolysis) 21
2.3.5噴霧乾燥法(Spray drying) 24
2.4噴霧乾燥機制 31
2.4.1霧化程序及粒徑大小控制 33
2.4.2粉末形貌控制 36
2.5 YAG:Ce螢光粉發光性質影響因素 40
2.5.1有機酸改質對於粉末性質影響 40
2.5.2粉末形貌對於發光性質之影響 42
2.5.3羧酸官能基之還原反應 44
第三章 實驗目的與方法 45
3.1 實驗設計 45
3.2 YAG:Ce螢光粉之製備 47
3.3 實驗藥品 48
3.4 實驗儀器設備 49
3.5 樣品性質及分析方法 50
3.5.1 X光晶體繞射分析儀 50
3.5.2 傅立葉轉換紅外線光譜儀 52
3.5.3 X射線光電子能譜儀 52
3.5.4 聚焦離子束顯微系統(Focused Ion Beam and Electron Beam System) 53
3.5.5 螢光光譜儀 (Fluorescence spectrometer) 55
第四章 結果 56
4.1 YAG:Ce前驅物溶液之性質分析 56
4.1.1前驅物溶液之紅外光譜分析 56
4.1.2前驅物溶液之黏度分析 58
4.2 YAG:Ce螢光粉體之性質分析 59
4.2.1 X光繞射晶相鑑定分析 59
4.2.2掃描式電子顯微鏡表面形貌分析與粒徑分析 61
4.2.3螢光光譜分析 65
4.2.4化學分析電子光譜分析 67
第五章 討論 72
5.1不同羧酸官能基對於金屬離子之錯合反應 72
5.2羧基對於粉末大小之影響 74
5.3羧基對於鈰離子還原之影響 76
5.4羧酸官能基對於螢光性質之影響 78
5.5 粉末成形機制探討 79
第六章 結論 80
第七章 未來工作 81
參考文獻 82

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