Powder synthesis of Ca-α'-SiAlON as a host material for phosphors
Powder synthesis of Ca-α'-SiAlON as a host material for phosphors
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DOI：
10.1021/cm048396r
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发表时间：
2005-01-25
影响因子：
8.6
通讯作者：
Mitomo, M
中科院分区：
文献类型：
--
作者：
Suehiro, T;Hirosaki, N;Mitomo, M
以NH3-CH4气体混合物为还原剂，以CaO-Al2O3-SiO2体系为原料合成了ca - α′-SiAlON粉体。在1400 ~ 1500℃的低温下完成了还原-氮化反应，没有出现不利的颗粒粗化或碳污染，同时通过合成后的热处理，粉末的相纯度和结晶度明显提高。制备的Ca-a′-SiAlON粉体纯度高，颗粒形态均匀，满足了SiAlON陶瓷作为荧光粉主体材料的新应用要求。本文还首次采用还原-氮化法制备了发黄的Ca-alpha′-SiAlON:Eu粉末荧光粉，其光致发光性能优于常规制备的粉末。
Fine powders of Ca-alpha'-SiAlON have been synthesized from the system CaO-Al2O3-SiO2, by using an NH3-CH4 gas mixture as a reduction-nitridation agent. Completion of the reduction-nitridation was achieved at low temperatures of 1400-1500 degreesC without unfavorable particle coarsening or carbon contamination, while the phase purity and crystallinity of the powders were markedly improved by a postsynthesis heat treatment. The resulting fine Ca-a'-SiAlON powders possessed high purity and uniform discrete particle morphology, which meet the requirements for the new application of SiAlON ceramics as a host material for phosphors. The reduction-nitridation synthesis of the yellow-emitting Ca-alpha'-SiAlON:Eu powder phosphor was also performed for the first time, and better photoluminescence property was demonstrated compared to that of the conventionally prepared powder.