臺灣博碩士論文加值系統

本研究是利用溶膠–凝膠法及旋轉塗佈製備堇青石(Mg2Al4Si5O18)螢光薄膜，並探討摻雜不同活化劑、熱處理條件及鍍膜條件對其結構、微結構及發光特性之影響。
乾燥薄膜經熱處理至900 ℃開始產生μ-Mg2Al4Si5O18結晶，隨著熱處理溫度到達1200 ℃開始出現α-Mg2Al4Si5O18，當溫度升至1300 ℃後則為α-Mg2Al4Si5O18的純相。FTIR分析顯示經燒結1300℃後訊號均為α- Mg2Al4Si5O18，SEM顯示薄膜具有緻密的微結構，AFM可以觀察到表面晶粒及表面的平整性，從XPS能發現摻雜Mn、Ce活化劑後氧空缺濃度的增加與EPR的結果相符合，而摻雜Eu由XPS發現到氧空缺濃度的降低與EPR的結果亦相符合。由吸收光譜顯示摻雜後薄膜的能隙值會略微降低，摻雜Mn2+離子的螢光薄膜經波長487 nm激發後會於503 nm出現綠光的放射波峰，最佳濃度為Mn=0.5%，摻雜Eu 3+離子的螢光薄膜經波長361 nm激發後於615 nm出現橘紅光的放射波峰，最佳濃度為Eu=5%，而摻雜Ce3+離子的螢光薄膜經波長295 nm激發後於424 nm出現藍光的放射波峰，最佳濃度為Ce=1%，經由共摻 Mn、Eu、Ce可製備出近白光區域的螢光薄膜。
活化劑種類與濃度、活化劑離子狀態、熱處理條件、及薄膜厚度會影響螢光薄膜之晶粒大小、結晶性、表面微結構及發光特性。

In this study, cordierite (Mg2Al4Si5O18) phosphor thin films were synthesized by the sol－gel and spin coating method. Effects of different activators, heat treatment and coating conditions, on the structure, microstructure and luminescence properties were investigated.
The dried films started to produce μ-Mg2Al4Si5O18 crystals after sintering at 900 ℃. When the heating temperature reached 1100 ℃, α-Mg2Al4Si5O18 appeared, and pure phase of α-Mg2Al4Si5O18 formed at 1300 ℃.
Analysis also revealed α-cordierite phase after heating at 1300 ℃. SEM showed that the films have good densification. The results of AFM showed the surface with fine grain and flat surface. From XPS, the increase of oxygen vacancy concentration after doping with Mn and Ce activators, which found is consistent with the results of EPR. The addition of Eu can be found the decrease in the concentration of oxygen vacancy, which is also is consistent with the results of EPR. It can be found that the energy gap value of doped samples are smaller than that of undoped film.

The phosphor films doped with Mn2+ ions showed a green emission peak at 517 nm under excitation at 452 nm, and the best concentration is Mn=0.5% . The films doped with Eu3+ ions exhibited an orange-red light emission peak at 616 nm as excited at a wavelength of 393 nm, and the best concentration is Eu=5%. The Ce3+ions doped phosphor films excited with a wavelength of 310 nm and then a blue emission peak appeared at 420 nm. The best concentration is Ce=1%. The Mn/Eu/Ce co-doped film possessed a near white light emission. The type and concentration of the activators, ion state of the activators, heat treatment conditions, and thickness of the film will affect the grain size, crystallinity, surface morphology and luminescence characteristic of the phosphor films.

摘要...i
Abstract...iii
誌謝...v
目錄...vi
表目錄...vii
圖目錄...ix
第一章 緒論...1
1.1 前言...1
1.2 研究動機...4
第二章 理論基礎與文獻回顧...6
2.1 堇青石簡介...6
2.2 螢光材料介紹...11
2.3 影響螢光粉發光因素...16
第三章 實驗方法與步驟...19
3.1 實驗流程...19
3.2 分析儀器與原理介紹...21
第四章 結果與討論...28
4.1 溶膠-凝膠反應...28
4.2 XRD 繞射圖分析...30
4.3 熱重分析(TG)與熱差掃描量熱(DSC)分析...44
4.4 傅立葉紅外線轉換光譜(FTIR)分析...45
4.5 掃描式電子顯微鏡分析(SEM)...47
4.6原子力顯微鏡(AFM)...51
4.7 X射線電子能譜儀分析(XPS)...56
4.8 電子順磁共振光譜分析(EPR)...61
4.9 紫外光/可見光光譜儀分析(UV-Vis)...64
4.10 螢光光譜儀分析(PL)...70
第五章 結論...91
參考文獻 ....92
Extended Abstract...97

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