利用高温固相法及微波燃烧法合成了Eu2+、Dy3+共掺杂的碱土金属硅酸盐荧光粉, 通过扫描电子显微镜、X射线衍射仪、荧光分析仪对荧光粉的性能进行了分析测试。结果表明,在1150 ℃下, 当Eu2+/Dy3+的掺杂比(摩尔分数比)为1∶3时, 高温固相法合成的Ba5Si8O21∶Eu2+,Dy3+荧光粉的荧光性能最好。对比高温固相法与微波燃烧法可知, 微波燃烧法可缩减产品的合成时间, 但产品发光强度较低。对比合成的Sr2MgSi2O7∶Eu2+,Dy3+和Ba5Si8O21∶Eu2+,Dy3+的性能可知, 碱土金属离子的种类会对荧光粉的发射波长产生影响。Ba5Si8O21∶Eu2+,Dy3+荧光粉具有良好的耐水性, 水浸24 h后, 其荧光损失率仅为2.3%, 可应用于荧光涂料。

Eu2+ and Dy3+ co-doped alkaline earth silicate fluorescent powders are synthesized by the high temperature solid-phase method and the microwave combustion method. The properties of the fluorescent powders are analyzed and measured by scanning electron microscope, X-ray diffractometer and fluorescence analyser. The results show that the Ba5Si8O21∶Eu2+, Dy3+ fluorescent powders synthesized by the high temperature solid-phase method have the best fluorescence property when they are sintered at 1150 ℃ and the Eu2+/Dy3+ ratio (the ratio of mole fraction) is 1∶3. Comparing the high temperature solid-phase method with the microwave combustion method, it is found that the microwave combustion method can reduce the synthesis time of Ba5Si8O21∶Eu2+, Dy3+ significantly, but the luminescent intensity of products is low. Comparing the properties of the synthesized Sr2MgSi2O7∶Eu2+, Dy3+ with those of Ba5Si8O21∶Eu2+, Dy3+, it is found that the type of alkaline earth metal ions has an effect on the emission wavelength of fluorescent powders. Ba5Si8O21∶Eu2+, Dy3+ fluorescent powders have good water resistance, and their fluorescence loss rate is only 2.3% after 24-h water immersion, which can be applied to fluorescent coatings.