采用高温固相法在N2-H2还原气氛下合成了一系列Sr3(PO4)2∶Eu2+蓝色荧光粉, 通过X射线衍射仪(XRD)、 荧光光谱仪(PL)对荧光粉的晶体结构、 激发和发射光谱进行了表征。 结果表明: 微量的Eu2+掺杂不会改变其晶体结构;Sr3(PO4)2∶Eu2+荧光粉在310～390 nm范围内可以有效的被激发, 激发峰位于359 nm;发射光谱为主峰位于438 nm宽带发射（带宽约为150 nm）, 对应于Eu2+的4f65d1→4f7跃迁. 通过高斯拟合发现, Eu2+至少占据了Sr3(PO4)2两种不同的Sr2+格位, 形成两个发光中心（430和459 nm）. 当Eu2+的掺杂浓度为7%时, 其具有最大的发光强度, 继续增大Eu2+的掺杂浓度, Sr3(PO4)2∶Eu2+的发射光谱会出现浓度猝灭现象, 且其发射峰会随着铕离子浓度增加而发生红移。 Sr3(PO4)2∶Eu2+荧光粉在近紫外区有着强而宽的吸收带, 与近紫外LED芯片发射相匹配, 相对发光强度是蓝色荧光粉BaMgAl10O17∶Eu2+(BAM) 的1.3倍, 是一种很有前途的白光LED用蓝色荧光粉材料。

A series of Sr3(PO4)2∶Eu2+ blue phosphors were synthesized by high temperature solid state method under N2-H2 reducing atmosphere. The crystal structures, excitation and emission spectra were characterized by X-ray diffraction (XRD) and Photoluminescence (PL), respectively. The results show that the Sr3(PO4)2∶Eu2+ phosphor can be efficiently excited by the wavelengths ranging from 310 to 390 nm, and the excitation peak wavelength locates at 359 nm. A wide emission spectrum (～150 nm, originating from the 4f65d1→4f7 of the Eu2+) with a peaking wavelength of 438 nm was obtained. Through the Gaussian fitting, we found that the emission band formed by two luminescence centers（430 and 459 nm）, which indicated that the Eu2+ occupied two different Sr2+ sites in the substrate of Sr3(PO4)2. As the Eu2+ doping concentration is 7%, the maximum luminous intensity was obtained. With the increasing of the doping concentration of the Eu2+, the concentration quenching effect occurred, and the emission peak wavelength has a red shift. The PL intensity of the Sr3(PO4)2∶Eu2+ phosphor is about 1.3 times than that of the blue emitting phosphor BaMgAl10O17∶Eu2+(BAM) which means that it is a promising candidate for the blue phosphor material for white LED.