BaMgAl10O17:Eu2+的MgF2表面包覆

采用溶胶-凝胶法对蓝色荧光粉BaMgAl10O17:Eu2 (BAM)进行表面包膜处理,获得了表面均匀包覆MgF2膜层的BAM荧光粉.并用SEM、XRD和IR手段对其表面形貌、晶格结构性能进行了表征;用EDS对BAM粉体的表面元素进行了定性分析;用荧光光谱测试对荧光粉的发光性能进行了研究.结果表明,在BAM粉体表面均匀包覆MgF2层后,BAM的晶格结构,发光性能没有改变,初始亮度较未包覆的荧光粉有所降低,经过相同条件的热处理后,包覆MgF2荧光粉的亮度热衰减程度明显低于未包覆的荧光粉,且色坐标偏移现象不明显.

Surface Coating of BAM Phosphors with MgF2

In this work, BAM phosphors were coated with MgF2 by sol-gel process. The surface morphology and the crystal structure were characterized by SEM, IR and XRD, respectively. The results indicated that the surface of BAM phosphors were evenly coated by MgF2 and the crystal structure of the coated BAM phosphors remained the same as the uncoated samples, I.e. After surface treatment, the luminescence centre of Eu2+ didn't shift, which still remain the emission with wavelength about 450 nm. The surface component of BAM phosphors coated with MgF2 was analyzed qualitatively by EDS. The emitting spectra of BAM phosphor particles coated without and with MgF2 were investigated under 254.7 nm excitation. The results demonstrated that the initial luminance of coated BAM phosphors was lower than the uncoated samples. But after roasting at 550,650 ℃ for 30 min respectively, the luminescence degradation of the coated BAM phosphors was improved greatly.