(Gd1-x，Prx)2O2S闪烁陶瓷粉体的合成及光致发光研究  

Synthesis and photoluminescence of Pr^(3+) doped Gd_2O_2S scintillation ceramic powders

作　　者：连景宝[1] 李晓东[1] 高铁[2] 刘志刚[1] 李继光[1] 孙旭东[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004 [2]东北大学材料电磁过程教育部重点实验室,辽宁沈阳110004

出　　处：《功能材料》2008年第5期713-716,共4页Journal of Functional Materials

基　　金：国家杰出青年科学基金资助项目(50425413);新世纪优秀人才支持计划资助项目(NCET-25-0290)

摘　　要：以Gd2O3、Pr6O11和H2SO4为原料,通过H2还原法合成不同浓度Pr3+离子掺杂的(Gd1-x,Prx)2O2S闪烁陶瓷粉体。利用DTA-TG-DTG、FT-IR、XRD、SEM、光致发光(PL)光谱等测试手段对合惩的粉体进行了表征。研究表明,将Gd2O3和Pr6O11与稀H2SO4在100℃加热搅拌,制备出2Gd2O3.(Gd1-x,Prx)2(SO4)3.12 H2O前躯体。前驱体在750℃煅烧2h可获得(Gd1-x,Prx)2O2SO4粉体,该粉体在H2气氛下750℃还原1h可以转化为具有疏松和多孔蜂窝状结构的单相(Gd1-x,Prx)2O2S闪烁陶瓷粉体。(Gd1-x,Prx)2O2S粉体在307nm的紫外光激发下呈现绿光发射,主发射峰位于511nm,归属于Pr3+离子的3P0-3H4跃迁。发光强度随Pr3+离子浓度的变化而变化,当Pr3+离子的摩尔分数为1.000%时,粉体具有最高的发光强度。Gadolinium oxysulfide powders doped with different concentrations of Pr^3＋ were synthesized using a hydrogen reduction method from Gd2O3, Pr6O11 and H2 SO4 starting materials. The synthesized powders were characterized by means of DTA-TG-DTG, FT-IR, XRD, SEM and PL spectrum analysis. The 2Gd2O3·（Gd1-x,Prx）2 （SO4）3·12H2O precursor was synthesized by mixing Gd2O3 and Pr6O11 with dilute H2SO4 at 100℃. （Gd1-x,Prx）2O2SO4 powders was obtained by calcining the precursor powders at 750℃ for 2h in air. Single phase gadolinium oxysulfide was prepared by reducing the （Gd1-x,Prx）2O2SO4 powders at 750℃ for l h in flowing hydrogen. The （Gd1-x,Prx）2 O2 S powders show porous microstructures. Under 307nm UV light excitation, the （Gd1-x, Prx） 2 O2 S powders show green emission at 511 nm, which corresponds to the ^3 P0-^3 H4 transition of Pr^3＋ ion. The emission intensity is dependent on Pr^3＋ concentration, and the （Gd0.99, Pr0.01 ）2 O2 S powder shows the highest luminescence.

关 键 词：Gd2O2S 闪烁陶瓷 H2还原法 光致发光 

分 类 号：TQ174[化学工程—陶瓷工业]