纳米单斜相Gd_2O_3∶Bi^(3+),Nd^(3+)的燃烧法制备和近红外发光

Combustion Preparation and Near-infrared Phosphors of Gd_2O_3∶Bi^(3+),Nd^(3+)

采用甘氨酸作为燃料,制备了单斜相Gd2O3∶Bi3+,Nd3+纳米发光材料。使用X射线粉末衍射仪和TEM对样品的结构和形貌进行了表征,并研究了制备条件对样品的可见及近红外激发和发射光谱、发光强度、荧光寿命等的影响。结果表明,体系中存在高效的Bi3+→Nd3+能量传递过程,当Bi3+和Nd3+的掺杂摩尔分数分别为6%和2%时,单斜相Gd2O3∶Bi3+,Nd3+荧光粉可以获得最强的近红外光发射。与单掺Nd3+的样品相比,单斜相Gd2O3中掺杂Bi3+和Nd3+后,样品的近红外发光增强近20倍。

Monoclinic Gd2O3∶Bi3+,Nd3+ phosphors were prepared by combustion method using glycine as a fuel. The structure of the phosphor was characterized by X-ray diffraction and TEM. The influences of Bi3 +/ Nd3 +concentration on the spectrum shape,fluorescence intensity and fluorescence lifetimes were investigated. The results show that there is an efficient energy transfer from Bi3+to Nd3+ ions in Gd2O3∶Bi3+,Nd3+. With optimized Bi3 +mole fraction of 6% and Nd3 +mole fraction of 2%,the monoclinic Gd2O3∶Bi3+,Nd3+ phosphor has the strongest near-infrared luminescence intensity,which is about 20 times stronger than the sample without Bi3+ doping.