溶胶-凝胶法制备YAG荧光粉及其性能研究

Synthesis of YAG phosphor by sol-gel method and its properties

以金属硝酸盐为原料，柠檬酸为络合剂，采用溶胶-凝胶法制备出了Y3Al5O12：Ce^3＋黄色荧光粉。用X射线粉晶衍射（XRD）对其进行了物相鉴定，表明900℃时已经得到纯的钇铝石榴石相（YAG）。用红外吸收光谱对所得粉体进行分析表明，当煅烧温度升高到900℃时，在低频区出现了位于724cm、792cm^-1的峰，这是YAG晶相金属与氧原子间的特征振动峰，说明YAG相已经形成。用扫描电镜（SEM）对其形貌分析，结果表明得到的产物粒径大致在3～10μm之间，平均粒径为6μm。用荧光光谱仪对其荧光光谱进行了研究，结果显示，在煅烧温度为1200℃时，其发光光谱强度最大。

Using metal nitrate as raw materials and citric acid as a complexing agent, we prepared Y3Al5O12 ：Ce^3＋ yellow phosphor by the sol-gel method （sol-gol）. The X-ray powder diffraction（XRD） showed that at 900℃ has been pure yttrium aluminum garnet phase （YAG）. The infrared absorption spectra of the powders showed that YAG phase has been formed when the calcination temperature to 900℃ ,because there are the characteristic vibrational peaks of metal and oxygen atoms which was in the low-frequency area at 724cm^- 1, 792cm^- 1 peak. As scanning electron microscopy （SEM） analysis of its morphology, the result proved the grain diameter ranges from 3 to 10μm, averaged at 6μm. Their fluorescence spectra were studied using fluorescence spectrometer and the results showed luminous intensity reached at the maximum when calcination temperature up to 1200℃.