摘要
为改进稀土三基色荧光粉尤其是BAM荧光粉的光衰问题,采用铝溶胶对BAM荧光粉粉体进行表面处理,获得了包覆氧化铝膜层的BAM粉。以SEM,XPS等方法对其表面形貌和组分进行测试。包覆率达到90%左右,且包覆膜层稳定。以未经包膜处理的BAM荧光粉作对照进行发光性能测试,测得包膜BAM粉的热稳定性得以改善,制成单色灯燃点试验后的光衰小于对照样品。对荧光粉表面吸附沉积的汞量变化进行检测,包膜BAM粉的含汞量小于未经包膜处理的对照样品。结果表明:对荧光粉进行表面包膜处理以保护粉体、提高热稳定性、降低光衰的研究工作是具有实际意义的。
For solving the problem on the degradation of light efficient of BAM phosphor,BAM phosphor was coated with alumina sol(the diameter of the particle is about 10nm) making an alumina protective film around the individual powder particle of BAM.The surface state and surface component of the coated powder were investigated with SEM and Xps.The alumina film coating rate on the power surface reached to be about 90% and the film layer was found quite stable as it could stand various processes, e.g., washing with water, coating in lamp tube and baking at high temperature. The BAM phosphor's luminescence performance was tested and compared to uncoated phosphor. An evident improvement has been found in the thermal stability. The thermal deterioration of the phosphor was alleviated obviously after annealing at 500,550, 600 and 650℃for 30min. By the way, the fluorescent lamps of single colour were prepared using the coated phosphor for the time lighting test. The degradation of light efficient was less than uncoated one evidently. For example, the degradation of the lamps after lighting for 1 000h, for the coated BAM phosphor was 6.1%, but 18.5% for uncoated one. The mercury amount adsorbed on the phosphor was determined by cold vapour atomic absorption spectrometry(CVAAS), and the result proved that the adsorbed amount on coated BAM phosphor was evidently less than that for uncoated one. Based on a series of results in the test, it was proved that the coating treatment of BAM phosphor can protect the phosphor powder and can improve the thermal stability and alleviate the decrease in luminance of the BAM phosphor. Therefore, the study by coating treatment for BAM phosphor with alumina sol is of significance in practice.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2003年第5期523-526,共4页
Chinese Journal of Luminescence
