臺灣博碩士論文加值系統

本研究是以溶膠–凝膠法製備堇青石(Mg2Al4Si5O18)螢光粉末，並探討電解質、活化劑及熱處理條件對其結構、微結構與發光特性之影響。
粉末經1000oC煆燒後開始產生α-堇青石結晶，並含有莫來石，經1300oC熱處理後，主要為α-堇青石結構，添加適量的電解質能減少莫來石的析出。XPS顯示摻雜鈰的粉末經1300oC煆燒後鈰離子以Ce4+為主，經還原氣氛退火後鈰離子以Ce3+為主；摻雜銪的粉末經1300oC煆燒後銪離子以Eu3+為主，經還原氣氛退火後銪離子以Eu2+為主；摻雜鈰之粉末以 310 nm波長激發後，放射峰為380 nm，摻雜銪之粉末以 465 nm進行激發，放射峰為615 nm。經還原氣氛退火後，摻雜鈰之粉末的激發峰會紅移至 315 nm，而放射峰紅移至 420 nm；摻雜銪之粉末的激發峰會藍移至 325 nm，放射峰會藍移至 450 nm，呈近白光放射特性。活化劑濃度及活化劑離子狀態會顯著影響粉末之發光特性。

In this study, Mg2Al4Si5O18 powders have been synthesized by the sol–gel process. Effects of the different activators and calcining conditions on the structure, microstructure and luminescence properties were investigated.
After calcining at 1000oC, the powder began to form α-Cordierite with small trace of mullite phase. α-Cordierite is the main crystalline phase after calcining at 1300oC. Ce-doped powder showed emission band centering at 380 nm under excitation at 310nm. Under excitation at 465nm, Eu-doped powder showed an emission peak at 615 nm. After annealing at reducing atmosphere, the excitation band of Ce-doped phosphors was found to be red-shifted to 315 nm, and the emission band red-shifted to 420 nm. For Eu-doped phosphors, both excitation and emission bands were blue-shift to 325 and 450 nm, respectively. The luminescent properties of the powders were highly dependent on the concentration of the doping activator and the state of the activator ions.

摘要...............................i
Abstract...........................ii
誌謝................................iii
目錄................................iv
表目錄...............................vii
圖目錄...............................viii
第一章 緒論...........................1
1.1 前言..............................1
1.2 研究動機..........................2
第二章 基礎理論及文獻回顧...............3
2.1 堇青石............................3
2.1.1堇青石的簡介......................3
2.1.2 特性與應用.......................3
2.2 螢光材料之特性......................7
2.2.1 螢光材料組成......................7
2.2.2 發光機制..........................7
2.2.3 史托克位移........................7
2.2.4 影響螢光材料之發光效率因素..........8
2.3 螢光粉末製備方法.....................16
2.3.1 沉澱法............................16
2.3.2 固態反應法.........................16
2.3.3 溶膠–凝膠法........................16
2.4 研究目的.............................19
第三章 實驗方法與步驟.....................20
3.1 實驗流程.............................20
3.1.1實驗步驟............................20
3.1.2實驗材料............................22
3.2 分析儀器與原理介紹....................23
3.2.1 結構分析...........................23
3.2.2 微結構分析.........................24
3.2.3 光學性質分析.......................25
第四章 結果與討論.........................31
4.1 溶膠–凝膠反應........................31
4.2 XRD繞射與結晶性分析...................34
4.3 熱重分析與熱示差掃描分析...............44
4.4 FTIR分析.............................46
4.5 SEM分析..............................48
4.6 TEM分析..............................52
4.7 XPS分析..............................59
4.8 UV-Vis分析...........................63
4.9 PL分析...............................68
第五章 結論...............................81
參考文獻..................................82
Extended Abstract..........................85

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