采用高温固相法在还原气氛下合成了Sr5-x(PO4)2SiO4∶xEu2+磷灰石型荧光粉。通过XRD、PL、SEM对样品的晶体结构、激发和发射光谱以及形貌进行了表征。在Eu2+浓度较低时, Eu2+占据不同的晶体格位而形成两个发光中心, 发射光谱具有双发射峰; 随着掺杂浓度的增加, Eu2+之间的能量传递使黄光区域的发射峰强度逐步增强, 并在x＝0.075时达到最大值。发射光谱红移可能是Eu2+受晶场强度和能量传递共同作用的结果。考察了该材料在白光LED中的封装应用性能, 其双发射峰有助于提升白光LED光源的显色性。

The apatite phosphors of Sr5-x(PO4)2SiO4∶xEu2+ were prepared by a high temperature solid-state reaction method in a reducing atmosphere. The crystal structure, excitation and emission spectra and morphology of the samples were characterized by XRD, PL and SEM methods, respectively. The effect of Eu2+ doping concentration on the luminescence properties of Sr5-x(PO4)2SiO4∶xEu2+ was also investigated. Two different luminescence centers were formed because Eu2+occupied two different crystallographic site in the crystal structure. Two emission bands located in blue and yellow light region were observed in a low concentration of Eu2+. Along with the increase of Eu2+ doping concentration, the PL intensity of emission peak in yellow light region gradually increased because of the energy transfer between Eu2+ ions, and reached the maximum value when x= 0.075. Red shift of the emission peak may be due to the joint action of crystal field strength and the mechanism of energy transfer. The application of these phosphors to the white LED was also explored. It is found that the phosphors with double emission peaks are beneficial to the improvement of color rendering properties to the LED light sources.