新型橙红色荧光粉Sr_2MgAl_(22)O_(36):Sm^(3+),M^+ (M=Li,Na)的制备及发光性能

Preparation and luminescent properties of a novel orange red phosphor Sr_2MgAl_(22)O_(36):Sm^(3+), M^+ (M=Li, Na)

采用高温固相法在1400℃合成了新型橙红色Sr_2MgAl_(22)O_(36):Sm^(3+),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MgAl_(22)O_(36)纯相。激发光谱显示,样品在330~480nm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Sm^(3+)掺杂浓度及电荷补偿剂对荧光粉发光性能的影响。Sr_(2-2x)Sm_xM_x(M=Li,Na)Mg Al22O36的发光强度随着Sm^(3+)浓度的增大,先增大后减小,最佳Sm^(3+)的掺杂量为x=0.05。Sr_(2-2x)Sm_xNa_xMgAl_(22)O_(36)的发光强度高于Sr_(2-2x)Sm_xLi_xMgAl_(22)O_(36)。

A novel orange red Sr（2-2x）SmxMx（M=Li, Na）MgAl（22）O（36） 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 Sr2MgAl（22）O（36） 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（2-2x）SmxMx（M=Li, Na）MgAl（22）O（36） 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 Sm^（3＋） 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 Sm^（3＋）and the optimized concentration of Sm^（3＋） was 5 mol%. Sr（2-2x）SmxNaxMgAl（22）O（36） showed higher luminescence intensity than Sr（2-2x）SmxLixMgAl（22）O（36）.