在本實驗中，我們選用三種不同的結構做為主體晶格，分別為Sr2SiO4、YInGe2O7及BaY2ZnO5。這些主體晶格分別摻雜Eu3+、Sm3+及Tb3+以製備紅光及綠光螢光粉。本實驗利用微波輔助燒結法製備紅光及綠光螢光粉，並討論其微結構及發光特性。為了做比較，另外利用傳統高溫爐以相同的燒結溫度但較長的燒結時間製備螢光粉。結果顯示，利用微波輔助燒結法製備之螢光粉可得到純相，表示利用微波輔助燒結法可在相當短的燒結時間內(1小時)即可得到單一相的螢光粉。因此，利用微波輔助燒結法製備高品質螢光粉可降低製程時間、成本及所需的能量。
另外，助熔劑 (flux)也常被用來促進燒結過程並提升螢光粉的發光特性。在本研究中，我們利用NH4Cl、Li2CO3、Na2CO3及K2CO3 做為助熔劑。助熔劑輔助固態燒結法在過去已被廣泛的用來降低燒結溫度及持溫時間。助熔劑同時可用來控制粉末的平均粒徑及螢光粉的外觀，外觀大小均勻的微米級螢光粉可有效的提升其發光亮度。另外，在本實驗中，我們利用鹼金族離子 (Li+、Na+、K+)來補償電荷，其可增加螢光粉的結晶性及發光強度。
在本研究的最後部分，我們選擇最佳條件所製備之螢光粉，並比較其發光特性。接著，我們選擇具有最佳的發光特性的紅色螢光粉與商用YAG:Ce黃粉混合，並封裝成白光LED。由實驗結果可知，本實驗利用微波輔助燒結法製備之紅色螢光粉應可提升一般YAG:Ce封裝之白光LED的演色性。

In this work, we choose three different structures as host, which are Sr2SiO4, YInGe2O7, and BaY2ZnO5. These structures are doped with Eu3+, Sm3+, and Tb3+ ions to produce red and green phosphors. The red and green phosphors are synthesized using microwave assisted sintering technique and discussed its microstructure and photoluminescent properties. For comparison, the sample was also sintered in the conventional furnace at the same sintering temperature for the same or longer holding time. The results show that the phosphors prepared using microwave assisted sintering can obtain the pure phase, indicating that rather short sintering time (1hr) is required to form the single phase of the phosphor. Therefore, microwave processing has the potential to reduce the time, cost, and required energy for the high quality production of phosphors.
In addition, several fluxes are used to improve the sintering process and to enhance the photoluminescent properties of the phosphors. In this study, NH4Cl, Li2CO3, Na2CO3, and K2CO3 are used as flux. Flux assisted solid state reaction method is a potential synthesis which were widely used to reducing the sintering temperature and holding time, and to obtain phosphor powders with desirable phases and properties. The flux also plays an important role in the control of the mean size, size distribution, and the shape of phosphor particles, which are used to improve the brightness of regularly shaped phosphor particles of micrometer size. Moreover, alkali metal ions such as Li+, Na+, and K+ are used for charge compensation to increase the crystallanity and enhance the emission intensity of Sr2SiO4:Eu3+ phosphors.
In the last part of this work, we choose the best sintering condition for each phosphor, and compare their photoluminescent properties. Among these, we choose a red phosphor with the best photoluminescent properties and try to package it into the commercial YAG:Ce white LED. The addition of the red phosphor prepared using microwave assisted sintering in this study is supposed to improve the color rendering properties of the commercial YAG:Ce white LED.

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