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Cerium-doped yttrium aluminum garnet (YAG:Ce) powder was synthesized by the Pechini method with aluminum nitride, yttrium nitride, citric acid and ethylene glycol as the starting materials. Structure, morphology and luminescence spectra were investigated by using X-ray diffraction, thermogravimetric and differential thermal analysis, scanning electron microscopy, Fourier transform infrared spectroscopy and photoluminescence spectroscopy measurements. The pure YAG phase was formed after heat treatment at 800 C for 3 h and no intermediate phase was observed. The average size of the particles was about 70 nm. The photoluminescence spectrum of the crystalline YAG:Ce phosphors showed the green-yellow emission with 5d?4f transition as the most prominent group. The increase of the ethylene glycol:citric acid molar ratio, resulted in a powder with smaller particle size and better luminescence properties. |
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银虫 (小有名气)
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RXMCDM: 金币+1, 多谢应助！ 2014-01-08 10:49:22
miaobobo510: 金币+10, 翻译EPI+1, ★有帮助 2014-01-08 15:22:11
RXMCDM: 金币+1, 多谢应助！ 2014-01-08 10:49:22
miaobobo510: 金币+10, 翻译EPI+1, ★有帮助 2014-01-08 15:22:11
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以氮化铝，氮化钇，柠檬酸和乙二醇作为原料，通过Pechini法合成铈掺杂的钇铝石榴石，通过X-射线衍射，热重-差热分析，电子显微镜扫描，傅里叶变换红外光谱和光致发光光谱测量来确定它的结构，外形与发光光谱。纯的YAG相在800℃，3小时热处理后形成，并且没有观察到中间其它相的生成。微粒的平均尺寸为70nm.YAG晶体的光致发光光谱：铬以5d-4f跃迁为最重要的部分，荧光呈现黄绿色发光带。乙二醇/柠檬酸的摩尔比的增加使粉末具有更小的颗粒以及更优的发光性能。 新虫回帖，求鼓励~ |
2楼2014-01-08 09:43:44
3楼2014-01-08 15:21:52
