臺灣博碩士論文加值系統

本研究是以溶膠–凝膠法製備矽酸鎂頑火輝石(enstatite; MgSiO3)螢光粉末，並探討不同活化劑濃度及熱處理條件對其結構、微結構及發光特性之影響。
粉末經600oC退火後開始形成單斜晶頑火輝石(clinoenstatite)結晶相，隨著溫度上升主要相逐漸轉換，至1300oC後呈原頑火輝石(protoenstatite)結晶相。
MgSiO3粉末摻雜錳或鈰，經415nm或318nm波長激發後，放射峰分別為640~750 nm或360~590 nm，具有橘紅光和藍光發光特性。摻雜劑種類與濃度及熱處理條件會影響粉末的晶粒大小、結晶性、顆粒大小及發光強度。

In this study, magnesium silicate phosphors(enstatite; MgSiO3) were synthesized by the sol–gel method. The effects of various activators and heat treatment conditions on the structure, microstructure and luminescent properties were investigated.
MgSiO3 powder started to crystallize into clinoenstatite phase after annealing at 600oC. After heat treatment at 1300oC, protoenstatite is the main crystalline phase. Different concentrations of activators and heat treatment conditions affect the grain size of the phosphors.
Mn-doped or Ce-doped MgSiO3 phosphors showed emission peak at 640 ~ 750 or 360 ~ 590 nm under 415 nm or 318 nm excitation, respectively. Different concentrations of activators and heat treatment conditions affect the grain size, crystallinity, particle size, and luminescence of the phosphors.

摘要................................i
Abstract............................ii
誌謝................................iii
目錄................................iv
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..........................2
第二章 基礎理論及文獻回顧...............5
2.1 頑火輝石晶體結構.....................5
2.2頑火輝石特性與應用.....................5
2.3 MgSiO3製備方法.......................12
2.3-1固態反應法(Solid state reaction).....12
2.3-2沉澱法(Precipitation method)........12
2.3-3水熱法(Hydrothermal method).........12
2.3-4溶膠–凝膠法(Sol–gel method)..........12
2.4溶膠–凝膠法基本原理.....................13
2.4-1水解................................13
2.4-2縮聚合................................13
2.4-3影響溶膠–凝膠法製程的因素..............13
2.5螢光材料................................16
2.5-1螢光材料控制之因素.....................16
2.5-2-1螢光材料發光機制.....................16
2.5-2-2史托克位移.........................16
2.5-3發光中心.............................17
2.5-4發光材料組成..........................17
2.5-4-1主體晶格............................17
2.5-4-2活化劑..............................17
2.6發光種類................................20
2.6-1發光應用與發光中心分類..................20
2.7影響發光效率之因素........................20
2.7-1主體晶格之影響.........................20
2.7-2內部缺陷效應...........................21
2.7-3濃度滅淬效應...........................21
2.7-4毒劑現象...............................21
2.7-5熱淬滅效應.............................22
2.8 CIE色度座標.............................22
2.9 研究目的................................25
第三章 實驗方法與步驟........................26
3.1 實驗流程................................26
3.2 分析儀器與原理介紹........................28
3.2-1X光繞射分析(XRD)........................28
3.2-2傅立葉紅外線轉換光譜 (FT-IR)..............28
3.2-3示差掃描熱量分析/熱重分析 (DSC-TGA)........28
3.2-4場發射掃描式電子顯微鏡 (FE-SEM )...........29
3.2-5紫外光/可見光光譜 (UV-Vis)................29
3.2-6螢光光譜 (PL)............................29
第四章 結果與討論..............................33
4.1 溶膠–凝膠反應..............................33
4.2 XRD繞射與結晶性分析........................37
4.3 熱重分析與熱示差掃描分析.....................44
4.4 FT-IR分析..................................46
4.5 XPS分析...................................48
4.6 FE–SEM分析................................52
4.7 TEM分析....................................56
4.8 UV-Vis分析................................61
4.9 PL與PLE分析................................64
4.10 衰減時間量測及色度座標分析..................75
第五章 結論.....................................79
參考文獻........................................80
Extended Abstract..............................83

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