SiO_2包覆CaAl_(12)O_(19)∶Mn^(4+)荧光粉的温度特性  

Temperature Dependence of Silica Coated Ca Al_(12)O_(19)∶Mn^(4+) Phosphor

作　　者：张海明[1] 张浩然[1] 刘应亮[1] 董汉武[1] 黄佳锋 陈淑怡[1] 雷炳富[1] 

机构地区：[1]华南农业大学材料与能源学院材料科学与工程系广东省光学农业工程技术研究中心,广州510642

出　　处：《无机化学学报》2015年第8期1489-1494,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金项目(No.21171071;21371062);广东省自然科学基金团队项目(No.S2013030012842)资助

摘　　要：采用溶胶-凝胶法制备无定型Si O2包覆Ca Al12O19∶Mn4+荧光粉,对样品进行XRD、TEM-EDS、FTIR以及发光性能分析。实验结果显示,包覆后样品的XRD图在22°左右出现了一个无定型二氧化硅特征宽峰,且随着Si O2包覆量的增加,该衍射峰的强度增强;FTIR分析发现样品包覆后存在明显的Si-O-Si键。Si O2包覆后Ca Al12O19∶Mn4+样品的激发和发射光谱峰值强度有所减弱;当包覆比为10%时,所制备样品的光辐照稳定性显著提高。通过对样品80~400 K变温光谱的分析表明,其发射光强度显现先增强后减弱的变化规律;与空白样品相比,二氧化硅包覆后的样品具有更高的热激活能。The Ca Al12O19∶Mn4＋ phosphors coated with amorphous SiO2 were prepared by means of sol-gel method and were characterized by XRD, TEM, EDS, FTIR and photoluminescence spectra. The X-ray diffraction results showed that the as-prepared powders appeared an amorphous silica feature wide peak around 22° which showing increasing intensity with increasing amount of coated SiO2. FTIR analysis found obvious Si-O-Si band of coated samples. The TEM demonstrated that the particle size was about 3-6 μm. After coated, the intensity of excitation and emission spectrum were reduced. It showed that the photostability of the 10% silica coated sample can be effectively improved with minimum loss of emission intensity. The temperature-dependent emission spectra of 50% silica coated and the uncoated samples were investigated from 80 to 400 K, the results found that an anti- quenching phenomenon that the emission intensities increased then decreased at increased temperature, and the coated samples has higher thermal activation energy compared with uncoated sample.

关 键 词：溶胶-凝胶法 二氧化硅包覆 CaAl12O19∶Mn4+ 温度依赖 

分 类 号：O613.72[理学—无机化学] O614.22[理学—化学]