空心半球形SrWO_4和SrWO_4∶Tb^(3+)/Eu^(3+)球形颗粒的合成及发光性能

Synthesis and Luminescent Properties of Hollow Semi-sphere SrWO_4 and SrWO_4∶Tb^(3+)/Eu^(3+) Microsphere

采用水热法制备了空心半球形SrWO4及Tb3+、Eu3+掺杂的SrWO4球形颗粒,利用XRD、SEM、荧光光谱等研究其物相、形貌及发光性能。未掺杂的SrWO4具有空心半球形形貌,属四方晶系。SrWO4∶Tb3+及SrWO4∶Eu3+为球形颗粒,其相结构与未掺杂样品类似,形貌从空心半球形转变为球形颗粒。随着Tb3+掺杂浓度的增加,SrWO4∶Tb3+的形貌从球状变成由纳米棒构成的花状;随着Eu3+掺杂浓度的增加,样品中出现了单斜相的Eu2WO6,其形貌也发生了明显的变化。在紫外光激发下,SrWO4∶Tb3+及SrWO4∶Eu3+的发射光谱由钨酸根的宽带发射和掺杂离子的特征发射组成,分别表现出绿光和红光发射。Tb3+的最佳掺杂摩尔分数为3%,Eu3+的最佳掺杂摩尔分数为25%。

Hollow semi-sphere SrWO 4 and rare earth ions(Tb3 +,Eu3 +) doped SrWO 4 microspheres were synthesized by hydrothermal treatment and characterized by XRD,SEM and photoluminescence(PL) spectrum.The results indicate that the undoped SrWO 4 has hollow semi-sphere morphology,with a tetragonal phase structure.The phase structure of SrWO 4 doped with Tb3 +or Eu3 + is similar to that of the undoped SrWO 4,while the morphology transforms from hollow semi-sphere to microsphere.With the increasing of Tb3 +doping concentration,the morphology of SrWO 4 ∶ Tb3 + changes from microsphere to micro-flower composed of many nanorods.The increasing of Eu3 +doping concentration leads to the presence of monoclinic phase Eu 2 WO 6 and the morphology change of SrWO 4 ∶ Eu3 +.Under the excitation of UV light,the emission spectra of SrWO 4 ∶ Tb3 +and SrWO 4 ∶ Eu3 +are mainly attributed to the characteristic emission of Tb3 +(5D 4-7F J transitions,J = 6,5,4,3) and Eu3 +(5D 0-7F J transitions,J = 1,2,3,4),respectively.The optimal doping mole fractions are 3% for Tb3 +and 25% for Eu3 +in SrWO 4.