【摘要】 采用高温固相法在1400℃合成了新型橙红色Sr₂MgAl₂₂O₃₆:Sm³⁺,M⁺（M=Li,Na）荧光粉。通过X射线衍射仪及扫描电镜对样品进行表征。XRD测量结果表明,所制备的样品为MgAl₂₂O₃₆纯相。激发光谱显示,样品在330⁴80nm范围内能得到有效激发。在405nm激发下,发射光谱由三个锐锋组成,其峰值位于562nm（4G5/2→6H5/2）,595nm（4G5/2→6H7/2）,640nm（4G5/2→6H9/2）,其中595nm处峰值最大。文章研究了Sm³⁺掺杂浓度及电荷补偿剂对荧光粉发光性能的影响。Sr_2-2xSm_xM_x（M=Li,Na）Mg Al22O36的发光强度随着Sm³⁺浓度的增大,先增大后减小,最佳Sm³⁺的掺杂量为x=0.05。Sr_2-2xSm_xNa_xMgAl₂₂O₃₆的发光强度高于Sr_2-2xSm_xLi_xMgAl₂₂O₃₆。更多还原

【Abstract】 A novel orange red Sr_2-2xSm_xM_x（M=Li, Na）MgAl₂₂O₃₆ phosphor was prepared by high temperature solid state reaction method at 1400℃. The phosphor samples were characterized by X-ray diffraction and Scanning Electron Microscopy and their photoluminescence were studied by the emission and excitation spectra. A pure Sr₂MgAl₂₂O₃₆ phase was confirmed. The excitation spectrum showed that the phosphors can be effectively excited by light from 330 to 480 nm, which indicated that Sr_2-2xSm_xM_x（M=Li, Na）MgAl₂₂O₃₆ could be effectively excited by the commercially available blue light of LED chips. Simultaneously, the emission spectrum showed that three sharp and strong emission peaks were located at 562 nm（4 G5/2 →6 H5/2）,595 nm（4 G5/2 →6 H7/2）, and 645（4 G5/2→6 H9/2）nm. The influences of the concentration of Sm³⁺ as well as charge compensation by co-doping with Li +, Na+ ions on the luminescent properties of the phosphor were investigated. The emission intensity of phosphor enhanced with the concentration of Sm³⁺and the optimized concentration of Sm³⁺ was 5 mol%. Sr_2-2xSm_xNa_xMgAl₂₂O₃₆ showed higher luminescence intensity than Sr_2-2xSm_xLi_xMgAl₂₂O₃₆.更多还原