补偿离子掺杂与烧成温度对SrTiO_3∶0.002Pr^(3+)材料的红色发光特性的影响  

Effect of Compensation Ions and Sintering Temperature on the Luminescence Properties of SrTiO_3∶0.002Pr^(3+) Phosphor

作　　者：洪樟连[1] 彭丽霞[1] 张朋越[1] 周时凤[1] 王民权[1] 

机构地区：[1]浙江大学材料科学与工程系

出　　处：《发光学报》2005年第4期497-501,共5页Chinese Journal of Luminescence

基　　金：浙江省教育厅(20030265);教育部留学回国人员科研启动基金(SRFforROCS;SEM;2003-14)资助项目

摘　　要：采用高温固相反应法合成SrTiO3∶Pr3+系发光材料,利用荧光光谱、XRD等分析手段,研究了工艺参数,如不同价态K、Ca和A l离子掺杂,以及1 050~1 300℃不同烧成温度对SrTiO3∶Pr3+体系发光性能的影响,以获得具有较好综合发光性能的SrTiO3∶Pr3+系发光材料。选择不同价态补偿离子掺杂是为了研究电荷补偿作用机制对该类材料发光性能的作用。结果表明:随着烧成温度的升高,磷光体发光强度先增加后减弱,在1 150℃烧成的材料其发光强度最大。无补偿掺杂与K、Ca或A l离子掺杂的所有样品均发出源于Pr3+的1D2→3H4跃迁的610 nm红色光。在不同价态补偿离子掺杂样品中,以掺A l的SrTiO3∶Pr3+体系发光强度最好;其发光强度比无补偿离子掺杂SrTiO3∶Pr3+材料的发光强度提高10倍左右。另一方面,与A l离子具有类似的引入阴离子电荷缺陷的K离子掺杂材料的发光强度则基本没有变化,其发光强度与没有电荷补偿作用的无掺杂及Ca离子掺杂SrTiO3∶Pr3+材料相似。上述实验结果可从电荷缺陷及微观固溶结构两方面的联合作用机制进行解释。在引入电荷缺陷的掺杂体系中,只有在发光离子PrS+r最近邻的Ti格位引入的电荷缺陷才能有效地起电荷补偿作用,达到增强发光强度的作用。研究结果给出了合理的制备工艺条件,并且提供了一种可有效提高发光强度的补偿离子掺杂的选择依据。The effect of preparation conditions such as sintering temperature on the luminescence properties of SrTiO3： Pr^3＋ phosphors doped by compensation ions with various valences were studied to obtain best luminescence property. The doping ions with various valences were selected to verify the charge compensation effect on the luminescence intensity as K and A1 seem to have similar charge compensation effect. PL spectra were measured to analyze the effect of preparation parameters, such as doping ions of K, Ca, Al and sintering temperature, on the luminescence properties of SrTiO3： Pr^3＋ phosphors. And XRD measurements were carried out to verify the crystal structure of prepared SrTiO3： Pr^3＋ phosphors. The results revealed that all samples emit red light at 610 nm originating from ^1D2→^3H4 transition of Pr^3＋ ions. The luminescence intensity varies with sintering temperature, while the samples sintered at 1 150 ℃ have the best luminescence intensity. Among K, Ca and Al doped samples, only the Al-doped samples have the obvious enhanced luminescence intensity, the strongest luminescence intensity was about 10 times as that of pure SrTiO3： Pr^3＋ phosphor without compensation doping. On the other hand, phosphor doped with K ions, which likely has similar charge compensation effect as that doped with Al ions, has little effect on the improvement of luminescence intensity. Contrary, it has similar intensity as that of either pure SrTiO3 ： Pr^3＋ phosphors or Ca-doped phosphors which are believed to have not such charge compensation effect. Above result about the effect of various ions doping on luminescence properties could be explained by combination of charge compensation effect and substitution structure effect. The charge compensation effect is effective only when the doping ions Al^3＋ is substitute for the Ti ions which is the nearest neighbor ion to the luminescence ions of PrSr^＋. Present study shows an optimal preparation condition and proposes a method to choose effective charge co

关 键 词：电荷补偿 发光 掺杂 烧成温度 SrTiO3:Pr^3+ 

分 类 号：O482.31[理学—固体物理]