(1. 浙江师范大学 行知学院，金华 321004；
2. 浙江师范大学 化学与生命科学学院，金华 321004)
摘 要: 以Li2CO3、SrCO3、H3BO3、Sm2(CO3)3、Eu2(CO3)3、Tb2(CO3)3、(BiO)2CO3为原料，用高温固相法合成了稀土激活离子RE3+与敏化离子Bi3+共掺杂的LiSr1-x-yBO3:yBi3+/xRE3+(RE=Sm, Eu, Tb)三个系列荧光粉。合成分两步进行，首先制备稀土单掺杂的荧光粉LiSr1-xBO3:xRE3+(RE=Sm, Eu, Tb)，以确定发光强度最大的样品所对应的稀土掺杂量x；其次在RE3+最佳掺杂量下，通过改变Bi3+的掺杂量来制备LiSr1-x-yBO3: yBi3+/xRE3+(RE=Sm, Eu, Tb)共掺杂荧光粉，从而研究敏化离子对激活离子的敏化情况及其中的能量转移机理。产物用X射线粉末衍射(XRD)与扫描电镜(SEM)测试其物相结构和形貌特征，研究离子共掺杂对荧光粉发光性能的影响，同时分析了荧光粉中掺杂离子之间的能量传递现象以及能量传递机制。结果表明，铋离子的掺入均能敏化基质中稀土离子的发光，在实验的掺杂量范围内呈现先增强而后减弱的变化趋势。根据Dexter能量转移公式并利用发光强度进行计算，可知偶极-偶极相互作用是Bi3+到RE3+能量传递的主要方式。
关键字: LiSrBO3；荧光粉；稀土；共掺杂；荧光性能
（1. Xingzhi College, Zhejiang Normal University, Jinhua 321004, China;
2. College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China）
Abstract:Three series of phosphors LiSr1-x-yBO3:yBi3+/xRE3+(RE=Sm, Eu, Tb) co-doped rare earth activating ions RE3+ and sensitizing ion Bi3+ were synthesized by high temperature solid-state reaction method from Li2CO3, SrCO3, H3BO3, Sm2(CO3)3, Eu2(CO3)3, Tb2(CO3)3, (BiO)2CO3. The synthesis was carried out in two steps. First, the single-doped rare earth RE3+phosphors LiSr1-xBO3:xRE3+(RE=Sm, Eu, Tb) were prepared so as to determine the amount of rare earth doping x corresponding to the sample with the highest luminous intensity. Secondly, under the optimal doping concentration of RE3+, LiSr1-x-yBO3:yBi3+/xRE3+(RE=Sm, Eu, Tb) co-doped phosphors were prepared by changing the doping amount of Bi3+ to study the sensitization effect of sensitized ion on activated ions and the energy transfer mechanism in it. The products were tested by X-ray powder diffractometry (XRD) and scanning electron microscopy (SEM) to test its phase structure and morphological characteristics. The effect of ion co-doping on the luminescence performance of the phosphor was studied. Meanwhile, the energy transfer phenomenon and energy transfer mechanism between co-doped ions in the phosphors were analyzed. The results show that the doping of bismuth ions can all sensitize the luminescence of rare earth ions in the matrix, and within the range of the experimental doping amount, it shows a trend of first enhancing and then weakening. According to Dexter’s energy transfer formula and calculation using luminous intensity, it can be seen that dipole-dipole interaction is the main way of energy transfer from Bi3+ to RE3+.
Key words: LiSrBO3; phosphor; rare earth; co-doped; luminescent property
