臺灣博碩士論文加值系統

氧化矽鋅(或稱矽酸鋅，Zn2SiO4)係具有高亮度及高效率的螢光材料，可廣泛應用在照明和顯示設備上。本研究是利用溶膠-凝膠法製備高純度氧化矽鋅，並探討不同摻雜劑及熱處理條件，對其結構和發光特性之影響。
摻雜不同的活化劑，可形成透明的溶凝膠，經旋轉塗佈及熱處理可製備螢光薄膜。實驗結果顯示隨著摻雜劑量的改變，膠化的速率會有所不同。經熱處理溫度600 oC後，會產生Zn2SiO4結晶相，經800 oC熱處理後會形成α-Zn2SiO4及少量的β-Zn2SiO4，而β-Zn2SiO4於900 oC時可轉變為α-Zn2SiO4，隨著熱處理溫度的升高結晶性亦明顯上升。
PL分析結果顯示，發光強度會隨摻雜劑量的改變而有明顯的變化，摻雜鈦會在390~410 nm有藍光放射波峰；摻雜錳會在525 nm有綠光放射波峰，當錳、鈦共摻時，呈現藍光和綠光的放射波共存，發光強度和熱處理條件相關。
關鍵詞：旋轉塗佈、矽酸鋅、溶膠-凝膠、光致發光

Zinc silicate is one of the fluorescent materials with high brightness and high efficiency. It can be used widely in the lighting and display devices. High purity zinc silicate phosphors have been prepared by sol-gel method in this study. The effects of various dopant species and heat-treatment conditions on the structure and photoluminescence properties of thin films phosphors were investigated.
The transparent sols could be obtained when doped with different activators, phosphor thin films were formed after spin-coating and heat-treatments processes. Experimental results showed that the rate of gelation will change with dopant amounts. The Zn2SiO4 crystalline phase was observed after heat-treatment at 600 oC. On heating at 800 oC, α-Zn2SiO4 and β-Zn2SiO4 appeared. When the temperature increased to 900oC, the β-Zn2SiO4 phase will transform into α-Zn2SiO4. The crystallinity of Zn2SiO4 increased with the temperature.
According to the photoluminescence measurement, the emission intensity of films was different with various dopant concentrations. There are blue emission band peaking at 390 ~ 410 nm for Ti-doped phosphors, and green band centered at 523 nm for Mn-doped phosphors. When co-doped with Ti and Mn, both the blue and green peaks appeared simultaneously.
Keywords: Spin coating, Zn2SiO4, Sol-gel, Photoluminecsence.

目錄
中文摘要 ……………………………………………………………… i
英文摘要 ……………………………………………………………… 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..………………………………………………….. 3
1.3 研究目的…..……………………………………………….. 4
1.4 矽酸鋅簡介….……………………………………………... 5
1.4.1 Zn2SiO4 發展…...………………………………………….. 5
1.4.2 Zn2SiO4 結構及性質…...………………………………….. 5
1.4.3 Zn2SiO4 之應用……...…………………………………….. 6
1.5 無機陶瓷發光材料之製備方法…………………………… 9
1.5.1 固態反應法 (Solid state method)………………………….. 9
1.5.2 沉澱法 (Precipitation method)…………………………….. 9
1.5.3 水熱法 (Hydrothermal method)………………………........ 10
1.5.4 噴霧熱分解法 (Spray pyrolysis method)……………..…… 10
1.5.5 微波輔助合成法 (Microwave assisted method)…………... 10
1.5.6 化學氣相沈積法 (Chemical vapor method)………………. 11
1.5.7 濺鍍法 (Sputtering method)……………………………….. 11
1.5.8 真空蒸鍍法 (Evaporation method)………………………... 12
1.5.9 溶膠-凝膠法 (Sol-gel method).............................................. 12
第二章 基礎理論及文獻回顧……………………………………… 13
2.1 光之簡介…………………………………………………… 13
2.1.1 光和電磁輻射……………………………………………… 13
2.1.2 可見光譜…………………………………………………… 13
2.1.3 紫外和紅外輻射…………………………………………… 14
2.2 發光原理…………………………………………………… 14
2.3 發光機制…………………………………………………… 15
2.4 史托克斯位移 (Stokes shift)………………………………. 15
2.5 缺陷發光 (Defect emission)……………………………….. 16
2.6 發光的種類………………………………………………… 17
2.6.1 光致發光 (Photoluminescencs)……………………………. 17
2.6.2 電致發光 (Electroluminescence)………………………….. 17
2.6.3 陰極射線發光 (Cathodoluminescence)…………………… 17
2.6.4 熱發光 (Thermaluminescence)…………………………….. 18
2.6.5 化學發光 (Chemiluminescence)…………………………... 18
2.6.6 生物發光 (Bioluminescence)……………………………… 18
2.6.7 聲致發光 (Sonoluminescence)…………………………….. 19
2.6.8 機械發光 (Mechanoluminescence)………………………... 19
2.7 發光材料之簡介…………………………………………… 19
2.7.1 螢光材料之組成…………………………………………… 19
2.8 溶膠-凝膠法………………………………………………... 21
2.8.1 溶膠-凝膠法原理………………………………………….. 21
2.8.2 影響溶膠-凝膠反應的因素……………………………….. 22
2.8.3 溶膠-凝膠法之優缺點……………………………………... 22
第三章 實驗方法與步驟…………………………………………… 31
3.1 實驗流程…………………………………………………… 31
3.2 分析儀器原理介紹……………………………………….... 33
3.2.1 結構分析…………………………………………………… 33
3.2.1.1 X光繞射儀 (XRD)……………………………………….. 33
3.2.1.2 霍式轉換紅外線光譜儀 (FT-IR)………………………….. 33
3.2.1.3 場發射掃描式電子顯微鏡 (FE-SEM)…………………….. 34
3.2.1.4 原子力顯微鏡 (AFM)……………………………………... 34
3.2.2 物性分析…………………………………………………… 35
3.2.2.1 質差與熱差分析儀 (TG/DTA)……………………………. 35
3.2.3 光學特性分析……………………………………………… 35
3.2.3.1 紫外光/可見光/近紅外光分光光度計 (UV-Vis-NIR)……. 35
3.2.3.2 螢光光譜儀 (FL)…………………………………………... 36
第四章 結果與討論………………………………………………… 40
4.1 溶膠-凝膠反應……………………………………………... 40
4.2 結構分析…………………………………………………… 45
4.2.1 XRD繞射與結晶性分析………………………………….. 45
4.2.2 質差與熱差分析…………………………………………… 52
4.2.3 FT-IR 分析………………………………………………… 54
4.3 微結構分析………………………………………………… 56
4.3.1 SEM & FE-SEM分析……………………………................ 56
4.3.2 AFM 原子力顯微鏡……………………………………….. 59
4.4 光學特性分析……………………………………………… 61
4.4.1 穿透光譜分析……………………………………………… 61
4.4.2 發光特性分析……………………………………………… 65
第五章 結論………………………………………………………… 75
參考文獻 ……………………………………………………………… 76
Extended Abstract
………………………………………………………………
80
簡歷 ……………………………………………………………… 85

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