螢光材料是一種光轉換材料，能於吸收晶片之激發光之後，放射不同波長的可見光，白光LED 的許多重要特性如發光效率、演色性、色溫、安定性及使用壽命等，皆相當決定於螢光材料的效能，螢光材料因而可說是白光LED 最重要的關鍵材料之ㄧ。目前白光 LED 照明仍有發光效率不足及缺乏紅光之演色性等極需改進問題，由於化學安定性與熱穩定性的問題，傳統之紅光螢光粉並不適合於LED 照明之應用，新近的研究發現氮化物螢光粉具有極佳之化學安定性與熱穩定性，發紅光且具高量子效率，使用氮化物螢光粉因而是解決目前LED 照明問題的重要途徑。然而，目前氮化物螢光粉之合成皆需在嚴苛的條件下進行，如高溫、高壓、長時間反應，使用空氣、溼氣敏感或昂貴之反應物及複雜之製程等，由於生產不易、產量小、設備及原物料成本高因而價格昂貴，以致氮化物螢光粉之應用進展受限，LED 照明推廣也受限。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CaAlSiN3:Eu2+螢光粉之方法。本論文並探討反應氣體壓力、反應物組成對產物轉化率及發光性質之影響。實驗結果發現藉由調配反應物間的組成與比例，可合成出不同轉化率、螢光強度及發光波長之CaAlSiN3:Eu2+螢光粉體，更可藉由調整主體晶格陽離子鈣元素濃度而可同時合成出多種不同發光波長及表面形貌之螢光粉體，如片狀之AlN:Eu2+ 藍綠光螢光粉體、片狀與棒狀之Ca-α-SiAlON:Eu2，橘紅光螢光粉體及同時具有片狀、棒狀與不規則狀之CaAlSiN3:Eu2+螢光粉體。由實驗結果發現棒狀之CaAlSiN3:Eu2+螢光粉體似乎較片狀與不規則狀之CaAlSiN3:Eu2+螢光粉體有較強之螢光強度，TEM-EDS觀察發現其棒狀結構之CaAlSiN3:Eu2+螢光粉體具有較佳之相純度，而產物中之Ca與Eu含量大致隨Ca含量增加而增加，但仍低於起始反應物之含量，其激發波長範圍均為220~600nm，若利用波長460nm 之藍光激發CaAlSiN3:Eu2+螢光粉可得到一主峰波長位置位於~650nm 及發光範圍介於500~800nm 之放射光譜。

White light LED lighting is believed to replace the conventional lighting and becomes the next generation lighting device due to its advantages such as energy efficiency, long lifetime, compactness, environment friendliness and designable features. Phosphors are essential materials for the fabrication of the LED lighting devices and their properties significantly affect the performance of the devices. Among various types of phosphor, the type with red emission is considered to be the most urgent one to be developed for two main reasons: Its use can improve the color rendering of the currently commercialized LED lighting devices and conventional red phosphors suffer from poor thermal and chemical stability and low quantum efficiency. Recently, nitride phosphors have been discovered and shown to be ideal for application in LED lighting due to their superior properties such as high quantum efficiency, long wavelength (red) emission and high thermal and chemical stability. However, the methods that have been developed for synthesis of nitride phosphors mostly suffer from either severe synthesis conditions or involving the use of moisture or oxygen sensitive starting materials, resulting in high production costs and thus high market prices of the commercially available nitride phosphors, and limiting the application of the LED lighting devices. In the past few years, we developed a combustion synthesis method for nitride phosphors with advantages including simple and inexpensive equipment required, relatively low cost of the reactants, a fast reaction and short processing time, potential capability for mass production. Effects of N2 gas pressure and reactant compositions related to product yield and emission property will be discussed in this research.The research result reveals the that product yield, emission intensity and wavelength of CaAlSiN3:Eu2+ phosphor can be controlled via adjust the reactant compositions using thermal insulation apparatus. Moreover, effects of Ca content (in the reactant mixture) on the formation and the photoluminescence properties of CaAlSiN3:Eu2+ phosphor (CASIN) were investigated. The plate-like blue-green emission of AlN:Eu2+ phosphor, both of plate-like and bar-like orange-red emission of Ca-α-SiAlON:Eu2+ phosphor and plate-like ,bar-like and irregular-shaped (i.e., agglomerated fine particles) red emission of CaAlSiN3:Eu2+ phosphor can be synthesized at the same time with various Ca contents. The bar-like morphology of CaAlSiN3:Eu2+ seen to have stronger emission than the other two morphologies (i.e., plate-like and agglomerated fine particles of CaAlSiN3:Eu2+), The Ca and Eu contents (expressed as molar ratios) in the synthesized products were found to increase roughly with increasing Y but were both lower than the respective Ca and Eu contents in the reactant mixtures.The synthesized CaAlSiN3:Eu2+ phosphor absorbs light in the region of 220–600 nm and shows a broad band emission in the region of 500–800 nm under excited by the blue light (460 nm) and generates emission peaking at ~650 nm.

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