单掺杂与共掺杂离子对Sr2Mg(BO3)2磷光体热释发光的影响  

Effect of Single-and co-Dopant on TL of Sr_2Mg(BO_3)_2 Phosphor

作　　者：刘丽艳[1,2] 李成宇[1] 郝景权[1] 唐强[3] 张纯祥[3] 张彦立[4] 苏锵[1] 

机构地区：[1]中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春130022 [2]沈阳师范大学化学与生命科学学院,沈阳110034 [3]中山大学物理系,广州510275 [4]中国计量科学院电力辐射与医学处,北京130000

出　　处：《化学学报》2009年第11期1201-1204,共4页Acta Chimica Sinica

基　　金：国家重点基础研究规划(No.G1998061312);沈阳师范大学主任基金(No.SY200803)资助项目

摘　　要：通过高温固相法合成了Sr2Mg(BO3)2磷光体,并研究了Li+,Bi3+,Gd3+,Ti4+共掺杂对Sr2Mg(BO3)2:Dy磷光体热释发光的影响.研究发现:Li+的共掺杂使Sr2Mg(BO3)2:Dy磷光体的热释光主峰强度增加,而Bi3+,Gd3+或Ti4+的掺入使样品的热释光强度降低.在Li+,Bi3+,Gd3+或Ti4+共掺杂的Sr2Mg(BO3)2:Dy磷光体高温热释光发射谱中,我们观察到了480,579,662和755nm的发射峰,为特征Dy3+离子的4F9/2→6H15/2,4F9/2→6H13/2,4F9/2→6H11/2和4F9/2→6H9/2跃迁,与Sr2Mg(BO3)2:Dy磷光体的发射一致.利用峰形法,我们评估了Sr2Mg(BO3)2:Dy30.+04,(Li0+.04)热释光磷光体234℃发光峰的动力学参数,陷阱深度E=1.1eV,频率因子s=6.3×109s-1,遵循二级动力学.Sr2Mg（BO3）2 thermoluminescence （TL） phosphor was synthesized by a high temperature solid state reaction and the effect of Li^＋, Bi^3＋, Gd^3＋or Ti^4＋ as a codopant on TL of Sr2Mg（BO3）2 ： Dy was investigated. The results show that Li^＋ as a codopant improves the emission intensity of high temperature TL peak of Sr2Mg（BO3）2 ： Dy phosphor whereas the addition of Bi^3＋, Gd^3＋ or Ti^4＋ leads to the decrease of TL intensity. The TL emission bands of Sr2Mg（BO3）2 ： Dy phosphors with Li^＋, Bi^3＋, Gd^3＋ or Ti^4＋ as a codopant are situated at 480, 579, 662 and 755 nm, which were attributed to the characteristic ^4F9/2→^6H15/2, ^4F9/2→^6H13/2, ^4F9/2→^6H11/2 and ^4F9/2→^6H9/2 transitions of Dy^3＋ ion, consistent with the emission of Sr2Mg（BO3）2 ： Dy phosphors. The kinetics parameters of 234 ℃ TL peak of Sr2Mg（BO3）2 ：Dy^ 3＋ 0.04 （Llo.04） phosphor with the values of trap depth E= 1.1 eV, frequency factor s=6.3 × 10^9 s^-1 were estimated by a peak shape method, which obey the second order kinetics.

关 键 词：热释光 Sr2Mg(BO3)2 镝 伽玛射线 

分 类 号：O482.31[理学—固体物理]