采用高温固相法制备了一系列Tb3+、Sm3+和Tb3+/Sm3+掺杂的Ca9Al(PO4)7荧光粉。采用X射线衍射技术、光谱及荧光寿命等手段表征了材料的性能。以Tb3+的380 nm激发峰作为激发源时, 发现Ca9Al-(PO4)7∶Tb3+, Sm3+的发射光谱中既包含Tb3+的5D4-7F6-3跃迁发射, 又含有Sm3+的4G5/2-6H5/2-9/2跃迁发射。当增加Sm3+的掺杂量时, 基于Tb3+-Sm3+间的能量传递, 有效地增加了Ca9Al(PO4)7∶Tb3+,Sm3+的发射强度, 能量传递的机理是电偶极-电偶极相互作用。另外, Ca9Al(PO4)7∶Tb3+,Sm3+的量子效率可以达到50.6%。上述结果表明, Ca9Al(PO4)7∶Tb3+,Sm3+材料在紫外-近紫外白光LEDs领域具有一定的潜在应用价值。

A series of activators Tb3+, Sm3+ and Tb3+/Sm3+ ions doped Ca9Al(PO4)7 phosphors were synthesized by high temperature solid-state method. The characteristics of phosphor were recorded by X-ray diffraction, luminescence and fluorescent decay curves. Under 380 nm excitation,the 5D4-7F6-3 of Tb3+ emission lines and 4G5/2-6H5/2-9/2 of Sm3+ orange emission lines can be observed from Ca9Al(PO4)7∶Tb3+,Sm3+. When increased Sm3+ contents, the orange-red emission intensity of Sm3+ can be enhanced by the efficient energy transfer from Tb3+ to Sm3+ ion, and the electric dipole-dipole interaction is responsible for the energy transfer. The best quantum efficiency of Ca9Al(PO4)7∶Tb3+,Sm3+ is 50.6%. The results indicate that it may be the potential application to ultraviolet-pumped white light emitting diodes.