铕掺杂磷酸锶钾荧光粉的制备与发光性能研究

Preparation and luminescent properties of Eu doped KSrPO_4 powders

采用高温固相反应法,以碳酸钾、碳酸锶、磷酸氢二铵、氧化铕为原料,制备了铕掺杂的磷酸锶钾荧光粉。用综合热分析仪、X射线衍射仪、扫描电子显微镜和荧光光谱仪等测试表征了实验样品。结果表明,煅烧温度在950℃可以获得单相的磷酸锶钾粉体,粉体的显微形貌为不规则形状,粒径分布在700 nm^4μm之间。粉体的光谱分析确定空气气氛热处理得到3价的Eu^(3+)离子,其作为发光中心产生620 nm的红色发光,Eu^(3+)离子发光强度在范围0.015 mol%和0.020mol%时具有较高的发光强度。

KSrPO_4:Eu^(3+)luminescent powders were prepared by high temperature solid state method.K_2CO_3, SrCO_3,(NH4)_2HPO_4 and Eu_2O_3 were used as the raw materials. The samples were characterized by TG-DTA, XRD, SEM and spectrometer, respectively. The results indicated that KSrPO_4:Eu^(3+)luminescent powders with excellent luminescent properties can be prepared at 950 oC for 3 hours in air. The powders have irregular shape and the particle size ranges from 700 nm to 4 μm. The excitation and emission spectra show the characteristics of Eu^(3+)ions. The main emission peak locates at 620 nm. The higher luminescent properties can be achieved by doping Eu^(3+)ions from 0.015 to 0.02 mol%.