摘要
采用溶胶-凝胶燃烧法制备出掺钐钇铝石榴石（YAG：Sm）荧光粉,并研究了凝胶化加热温度、柠檬酸/硝酸盐比值（MRCM）、pH值等因素对前驱体和YAG粉体性能的影响。结果表明：当加热温度为80℃,MRCM=1-2,pH值在1-3时,凝胶化时间较短,胶体成型情况良好;随着热处理温度的升高,前驱体从金属羧酸盐变成无定形碳酸盐,至900℃转变为纯YAG相。Sm3＋：YAG在550-750nm波段内的发射峰对应于Sm3＋的4G5/2→6HJ（J=5/2,7/2,9/2和11/2）能级跃迁,其中对应4G5/2→6H7/2跃迁的发射峰强度最大。
Samarium-doped yttrium aluminum garnet（YAG∶Sm） phosphors were synthesized by nitrate-citrate sol-gel combustion method.The influences of heat treatment,nitrate/citrate mole ratio（MRCM） and pH value on precursor and phase formation were investigated by X-ray diffractometry（XRD）.As-prepared YAG∶Sm powders and the calcination process were characterized by using differential scanning calorimetry（DSC）,thermogravimetry（TG）,and Fourier transform infrared（FTIR） spectroscopy.It is shown that when gelling temperature is 80℃, MRCM=1-2 and pH=1-3, the gelling time is shortened, and colloid is in good order. The precursor changed from metal complex into amorphous metal-carbonate, and then into pure YAG crystalline phase at 900℃. The photoluminescence spectra excited by 405nm showed several obvious emission bands located at the range of 550-700nm, corresponding to the 4G5/2→6HJ（J=5/2, 7/2, 9/2 and 11/2） and typical transitions of Sm3 ＋ ions, respectively. In addition, the intensity of transition corresponding to 4 4G5/2→6H7/2 is the strongest.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2009年第4期586-589,626,共5页
Journal of Materials Science and Engineering
基金
江苏省自然科学基金重大资助项目(BK2007724)
关键词
溶胶-凝胶燃烧法
影响因素
钇铝石榴石
工艺过程
发光
sol-gel combustion process
influence factors
yttrium aluminum garnet
technical process
luminescence
