臺灣博碩士論文加值系統

為了符合現今白光發光二極體的需求與應用，如高發光效率、高演色性、壽命長等，必須找出一種具有高發光效率、熱穩定性佳以及可使用藍光或紫外光激發之螢光粉體，而氮氧化物螢光粉Ca-α-SiAlON即具有這些優點，由於現今技術製造此種氮氧化物螢光粉體所需的條件較為嚴苛，如：須在高溫、高壓或長時間下反應且設備昂貴，以致生產成本高，此類氮氧化物螢光粉之應用故而受限。本論文研究乃引用本實驗室過去建立之合成氮化物陶瓷粉體之燃燒合成法，針對氮氧化物螢光粉之合成特性，予以改良創新，最後成功地開發出能夠在低壓下以及在短時間內可大量製造Ca-α-SiAlON螢光粉之方法。此方法係使用引燃劑包覆反應物並在保溫裝置中進行燃燒合成反應，本論文並探討引燃劑與反應物尺寸及比例之關係、保溫裝置對產物之影響、反應物的組成對產物之影響、最後找出發光強度較佳之條件並與市售螢光粉作比較。實驗結果發現在保溫裝置的使用下，並利用直徑3cm之引燃劑包覆直徑1.7cm之反應物，藉由調配反應物間的組成與比例，則可合成出不同螢光強度及波長之範圍之Ca-α-SiAlON螢光粉體，在較佳的組別中，此螢光粉的激發波長範圍為220~500nm，若利用380nm之紫外光激發此螢光粉可得到一主峰波長位置位於555nm及發光範圍介於400~670nm之放射光譜，其螢光發光強度可達市售螢光粉的94.1%。

In order to fulfill the current requirements and applications such as high efficiency, color rendering index, and superior lifetime in light emitting diode (LED). It is necessary to develop a novel phosphor material which has high luminescence intensity, thermal stability, and can be excited from blue to UV light. The literatures indicated that oxynitride phosphor (Ca-α-SiAlON) had these excellent advantages. However, the conditions for producing this kind of oxynitride phosphor by using nowadays synthesis methods are too strict such as high temperature, high pressure, long duration time, and expensive equipments. For the reason the production costs of oxynitride phosphor are too high to limit its applications. This thesis related to an innovative and improved method for synthesis of oxynitride phosphors (Ca-α-SiAlON) based on self-propagating high temperature synthesis (SHS) reactions which had been developed on nitride ceramic materials in our laboratory. Finally this thesis successfully developed a new SHS method by covering the reactant with an igniting agent. The Ca-α-SiAlON phosphor was produced in large scale, low pressure, and short duration time. It discussed the effects on the properties of the product including different compact size between reactant and igniting agent, thermal insulation equipment, reactant composition, and compared with the commercial phosphor. The results showed that the phosphor with different luminescence intensity and wavelength by using different condition and parameters. Finally there was a product which excitation spectrum was covered the range of 220-500nm and a broad emission band in the range of 400-670nm and centered at 555nm was observed upon 380nm excitation. The luminescence intensity is 94.1% compared with commercial phosphor.

中文摘要 I
英文摘要 II
誌謝 III
總目錄 IV
表目錄 VII
圖目錄 VIII
第一章 緒論 1
1-1 前言 1
1-2 白光發光二極體簡介及應用 2
1-3 研究動機及目的 3
第二章 理論基礎及文獻回顧 5
2-1 螢光材料 5
2-1-1 螢光材料之崛起 5
2-1-2 螢光材料之分類 6
2-1-3 螢光材料之應用 9
2-2 螢光材料之理論基礎 10
2-2-1發光種類及機制 10
2-2-2 發光原理 12
2-2-3 影響螢光發光特性之因素 17
2-2-4 稀土離子的發光特性 22
2-3 α-SiAlON螢光粉之介紹及文獻回顧 24
2-3-1 α-SiAlON螢光粉之介紹 24
2-3-2 α-SiAlON螢光粉之文獻回顧 25
2-4 合成α-SiAlON螢光粉之方法及比較 32
第三章 實驗方法及設備 38
3-1 實驗藥品 38
3-2 實驗設備及分析儀器 39
3-2-1壓模成形設備及模具 39
3-2-2燃燒合成反應器 40
3-2-3保溫裝置 42
3-2-4分析儀器 43
3-3 儀器原理及量測方法 44
3-3-1 熱電偶溫度之量測 44
3-3-2 晶相分析 44
3-3-3 光學特性分析 45
3-3-4 微結構及元素分析 46
3-4 實驗方法及流程 47
3-4-1 反應物製作 47
3-4-2 引燃劑包覆 48
3-4-3 反應錠之保溫 49
3-4-4 反應錠反應的進行 49
3-4-5 反應溫度之量測 50
3-4-6 產物之分析 50
第四章 結果與討論 52
4-1 反應錠尺寸對產物之影響 53
4-2 保溫裝置對產物之影響 67
4-3 反應物的組成對產物之影響 78
4-3-1 氮化矽對產物之影響 78
4-3-2 疊氮化鈉對產物之影響 86
4-3-3 氯化銨對產物之影響 94
4-3-4 銪離子摻雜量對產物之影響 105
4-4 最佳參數之探討 113
第五章 結論 122
參考文獻 124
自述 129

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