橙红色荧光粉Ca_(1-x-y)Sm_xBi_ySiO_3的制备及其发光性能  

Preparation and Luminescence Properties of Reddish-Orange Phosphors of Ca_(1-x-y)Sm_xBi_ySiO_3

作　　者：吴锦绣[1,2] 李梅[1,2] 柳召刚[1,2] 胡艳宏[1,2] 王觅堂[1,2] 

机构地区：[1]内蒙古科技大学材料与冶金学院,包头014010 [2]内蒙古自治区高校稀土现代冶金新技术与应用重点实验室,包头014010

出　　处：《无机化学学报》2015年第3期452-458,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家杰出青年基金(No.51045216);内蒙古高校基金(No.NJZY13134);内蒙古科技大学青年创新基金(No.81111509)资助项目

摘　　要：以Sm3＋作为激活剂,Bi3＋作为辅助激活剂,采用水热法合成Ca1-x-ySmxBiySi O3前驱体,然后在1 100℃焙烧得到系列橙红色荧光粉。用X-射线衍射仪、扫描电镜和荧光分光光度计和傅里叶变换红外光谱等手段对样品的组成、结构和形貌及其发光性质进行分析和表征。分析结果表明：产物都为三斜晶系结构的Ca1-x-ySmxBiySi O3和四方结构的方石英Si O2共熔体。在405 nm近紫外光激发下,产物的发射光谱由3个峰组成,发射峰值位于566、606和650 nm处,分别归属于Sm3＋的4G5/2→6HJ/2（J=5,7,9）跃迁。产物的激发光谱在405 nm有很强的发射带,与近紫外LED芯片匹配。随着Sm3＋掺量的增加,样品发光强度先增强后减弱,当Sm3＋的物质的量分数为3%时发光强度达到最大,浓度猝灭机理为电偶极-电偶极相互作用。当Bi3＋的物质的量分数在0.3%~1.5%时,对产物Ca0.97Sm0.03Si O3的荧光强度起敏化作用。Sm3＋和Bi3＋的最佳物质的量分数分别为3%和0.5%。The series Sm3＋ as activator and Bi3＋ as auxiliary activator precursor Ca1-x-ySmxBiySiO3 were synthesized by hydrothermal synthesis. After calcined at 1 100 ℃ the precursors became series of orange-reddish emitting phosphors. The phase structure, morphology and luminescent properties of the as-synthesized samples were characterized by X-ray diffraction, fourier transform infrared spectroscopy, scanning electron microscope and fluorescence spectrophotometer respectively. The results indicate that samples was an eutectic mixture which contain triclinic CaSiO3 and cristobalite SiO2. The emission spectra of Ca1-x-ySmxBiySiO3 phosphors exhibit three main peaks at 566, 606, 650 nm assigned to the4G52→6HJ/2（J =5, 7, 9） transitions of Sm3 ＋under 405 nm excited radiation. The excitation spectra of Ca1-x-ySmxBiySiO3 phosphors reveal intensive excitation bands at 405 nm,which match with near-UV LED chips. The luminescence intensity firstly increases with increasing of Sm3 ＋concentration, and then decreases. The emission reaches the maximum intensity at Sm3＋ doped amount of 3%mole fraction, and the concentration quenching mechanism is the electric dipole-electric dipole interaction. When the amount is 0.3% ~1.5% mole fraction, Bi3＋ have sensitized effect on the luminescence intensity of Ca0.97Sm0.03 SiO3. So the optimum mole fraction of Sm3＋ and Bi3＋ were 3% and 0.5%, respectively.

关 键 词：荧光粉 硅酸盐 水热法 Sm3 Bi3+ 

分 类 号：O614.331[理学—无机化学] O614.532[理学—化学]