近幾年來，將具低耗電、無熱輻射、環保與使用壽命長等優點的白光LED作為照明光源是未來最被看好的發展趨勢。日亞化學利用GaN藍光晶片與黃色釔鋁石榴石(yttrium aluminum garnet,YAG)螢光粉的結合可以發出白光，此乃目前市面上最常見的白光LED的製作方式。為進一步提升白光LED的發光效率，研究出螢光效率更優良的YAG:Ce黃色螢光粉是必須的。

　　微波加熱技術是種高效率的加熱方法，近來廣泛的被應用。吾人利用微波加熱技術配合燃燒反應法可以順利合成YAG：Ce黃色螢光粉，實驗發現可以利用不同燃料的調配與煅燒溫度的調整控制螢光粉的粒徑範圍且粒徑分佈均勻，最小的粉體粒徑可以達到50nm，合成出來的產物為YAG晶相而無雜相。

　Recently, white light emitting diode(LED) has become the trend of illumination source because of its energy saving、no heat radiation、low pollution and long using life. The most popular white light emitting diode is fabricated by the combination of GaN blue chip and yttrium aluminum garnet phosphor in the market condition. In order to promote the lighting efficiency of white LED, It’s necessary to research better YAG:Ce phosphor.

　Microwave heating technology is an efficient way of heating and used widely in many industry recently. We can synthesize YAG:Ce phosphor by applying microwave heating technology and combustion reaction. According to our experiment, we can control the particle size of YAG:Ce phosphor by adjusting fuels and calcinations temperature. The minimum particle size is 50 nm and there is no other phase but YAG phase in the product.

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