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[求助]
麻煩大家翻一個簡短摘要
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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. |
銀蟲 (小有名氣)
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以氮化鋁,氮化釔,檸檬酸和乙二醇作為原料,通過Pechini法合成鈰摻雜的釔鋁石榴石,通過X-射線衍射,熱重-差熱分析,電子顯微鏡掃描,傅里葉變換紅外光譜和光致發(fā)光光譜測量來確定它的結構,外形與發(fā)光光譜。純的YAG相在800℃,3小時熱處理后形成,并且沒有觀察到中間其它相的生成。微粒的平均尺寸為70nm.YAG晶體的光致發(fā)光光譜:鉻以5d-4f躍遷為最重要的部分,熒光呈現(xiàn)黃綠色發(fā)光帶。乙二醇/檸檬酸的摩爾比的增加使粉末具有更小的顆粒以及更優(yōu)的發(fā)光性能。 新蟲回帖,求鼓勵~ |
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