摘要
　　白光 LED 由於具有環保、節能的優點，可望在未來 5~ 10 年內取代傳統室內照明，因此廣泛的被探討。而釔鋁石榴石（YAG）因其獨特結構，在添加微量稀土元素（如：Ce）後便具有發光的特性，所以適合作為高亮度白光 LED用之螢光粉體。
　　綜合前人研究之結果可知，製備 YAG 螢光粉體多採用可在較低溫合成之化學法，鮮少採用具有較高發光強度之傳統固相反應法，然影響 YAG 螢光粉體發光特性之因素主要為晶粒大小、晶粒形狀與結晶度，因此本研究揉合傳統固相反應法與化學法的優點，藉由控制 pH 值的方式使固相反應物均勻混合，降低合成純相 YAG：Ce 螢光粉體的反應溫度及時間（可於 1300℃/24 h 或 1350℃/16 h 合成純相 YAG：Ce螢光粉體），並搭配噴霧乾燥之技術合成具有 um-scale 單晶晶粒之分散螢光粉體，不但可以改善傳統固相反應法混合不均的問題與化學法產生凝聚之難題，同時亦可提高 YAG：Ce 螢光粉體之螢光性質。

Abstract
　This research combines the advantages of conventional solid-state reaction method and chemical methods to synthesize pure YAG:Ce phosphor via pH-controlled mixing. Compare with conventional solid-state reaction method, pure YAG:Ce phosphor could be obtained at 1300℃/ 24 h or 1350℃/ 16 h through this method. Besides, dispersed phosphor with um-scale single crystal could also be obtained at 1500℃/ 4 h via pH-controlled mixing with spray drying. Because of improving of the problems of mixedness from the conventional solid-state reaction method and the puzzles of agglomeration from the chemical methods, the YAG:Ce via pH-controlled mixing could also have the better luminescent property.

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