臺灣博碩士論文加值系統

本研究使用固態法結合CO2雷射燒結製備摻鈰釔鋁石榴石螢光陶瓷(YAG:Ce)，可將全部的前驅物完全轉換成YAG。經由前驅物熱分析發現，添加氧化鋁比例的增加失重率越低。使用雷射燒結法結合固態反應法其訊號(420)繞射峰介於雷射法與固態反應法之間，經過固態法後(420)繞射峰會往高角度偏移。SEM可觀察到固態法粒徑D50為3.61 μm、雷射法粒徑D50為3.12 μm、雷射法結合固態法粒徑D50為44.55 μm，相較於雷射法或是固態法，使用雷射燒結法結合固態反應法表面晶粒顆粒更加接近於球型且有粗大化的趨勢，原因為雷射法後已經產生了YAG與非晶相，固態反應法進行二次燒結。由TEM可以觀察到，固態法與雷射燒結法結合固態反應法兩種製程都能發現，因為超過溶解度極限650 ppm±60 ppm，而在三接面析出SiO2顆粒。由x光能量分散光譜儀訊號發現YAG:Ce晶粒中成份(Y/Al)並不均勻，推測其是由雷射快速升降溫所導致。觀察樣品剖面使用CL觀察能發現只有YAG部份發光，而氧化鋁沒有發光反應。經由PL無法觀察到不同氧化鋁wt%與PL的趨勢，需要再進行探討。

In recent years, light emitting diodes (LEDs) are widely used to replace conventional light sources because of their energy saving property, conversion efficiency, and the rise of environmental awareness. In white LEDs (WLEDs), cerium-doped yttrium aluminum garnet (YAG:Ce) can be manufactured by methods of sol-gel, one-pot synthesis and solid state reaction (SSR). Currently, the technique of additive manufacturing using laser is rapidly growing for customized products or protypes. This study will present the preparation of YAG:Ce using CO2 laser sintering and then SSR, transforming precursor powders not only surface but also interior entirely into YAG:Ce. Crystal structure and microstructure of the above YAG:Ce phosphor ceramics will be studied and compared with solely laser sintering or SSR.

摘要 ...........i
Abstract .........iii
誌謝 ...........iv
目錄................... v
表目錄 .............viii
圖目錄............ ix
第一章 緒論 ............1
1.1前言.................... 1
1.2研究動機與目標 .............1
第二章 理論基礎與文獻回顧 .............2
2.1 螢光材料簡介............... 2
2.1.1螢光材料發光機制與應用 .........2
2.1.2螢光粉的組成 .............3
2.2影響螢光材料發光特性之因素.......... 3
2.2.1 主體結構之發光 ........3
2.2.2 斯托克位移................. 4
2.2.3 濃度淬滅效應 ..............4
2.2.4 熱淬滅效應 .................5
2.3 固態照明簡介............... 6
2.3.1 白光發光二極體製作方式............... 6
2.3.2 發光二極體封裝方式 .............6
2.3.3 白光二極體發展現況與趨勢............. 7
2.4 釔鋁石榴石簡介 ............7
2.4.1 YAG結構介紹 ...............7
2.4.2稀土離子的發光特性.......... 8
2.4.3 YAG:Re 文獻回顧 ........11
2.5 YAG共晶性質 ............12
2.5.1 氧化鋁介紹.......... 12
2.5.2 共晶YAG文獻回顧 .......13
2.6 雷射燒結 ..........19
2.7 儀器原理 .........20
第三章 實驗方法與步驟 .........29
3.1 實驗藥品 ...........29
3.2 量測與分析設備 ........30
3.2.1 CO2雷射雕刻機 ..........30
3.2.2 x光繞射儀 .........30
3.2.3 掃描式電子顯微鏡 ...........30
3.2.4 穿透式電子顯微鏡 .........31
3.2.6 雙束型聚焦離子束 ............31
3.2.7 熱分析儀 ..........31
3.2.8 x射線光電子能譜學 .........31
3.2.9 冷均壓機 ............31
3.2.10 熱風循環烘箱(forced convection oven) .........32
3.2.11 球磨機(ball milling machine) .............32
3.2.12 研磨拋光機(grinding and polishing machine) ..........32
3.2.13 慢速切割機(low speed cutter) ..........32
3.2.14 光致發光光譜儀(photoluminescence, PL) .........32
3.3 實驗流程 ............33
3.3.1 固態反應法製備共晶YAG:Ce螢光陶瓷 .........33
3.3.2 雷射燒結法製備共晶YAG:Ce螢光陶瓷 ..........34
3.3.3 雷射法樣品進行固態法應法製備共晶YAG:Ce螢光陶瓷 ..........35
第四章 實驗結果與討論 ...........37
4.1固態法製備YAG:Ce-Al2O3 共晶螢光陶瓷 ...........37
4.1.1 熱性製探討 ..............37
4.1.2 晶體結構與成份分析探討................. 40
4.1.3 光學性質探討 ................45
4.2雷射法製備YAG:Ce-Al2O3 共晶螢光陶瓷 ..................47
4.2.1 晶體結構與微觀結構探討 ................47
4.2.2光學性質探討 ..............51
4.3雷射燒結法後固態反應法製備YAG:Ce-Al2O3共晶螢光陶瓷 ...........54
4.3.1 晶體結構與微觀結構探討 .................54
4.3.2光學性質探討 ....................57
第五章 結論 ............61
參考文獻 .................62
Extended Abstract .............65

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