BaAl_(12)O_(19)∶Mn^(2+)荧光粉的表面包覆与发光性能  

Synthesis and Characterization of Surface-modified BaAl_(12)O_(19)∶Mn^(2+)

作　　者：王晓君[1] 段桂花[2] 赵晓霞[1] 赵学平[3] 崔玉明[2] 申连春[2] 谢宜华[1] 杨华[2] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所激发态物理重点实验室,吉林长春130033 [2]吉林大学化学学院,吉林长春130023 [3]吉林大学物理学院,吉林长春130023

出　　处：《发光学报》2005年第1期56-60,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(50172046);国家"863"计划项目(2002A311160);吉林省科技发展计划(20030303)资助项目

摘　　要：采用传统的高温固相反应法合成出BaAl12O19∶Mn2+荧光粉,利用乳胶法对荧光粉颗粒表面包覆MgF2。对包覆过程中的反应物浓度、反应过程进行研究,得到最佳包覆条件,确定荧光粉表面包覆的制备工艺。通过X射线衍射、透射电镜图、红外光谱等对表面包覆的荧光粉颗粒的结构性能进行分析,并在彩色等离子体平板显示器(PDP)上进行涂屏老化实验。结果表明在BaAl12O19∶Mn2+荧光粉颗粒表面成功地包覆上MgF2 层,包覆后的荧光粉的初始发光亮度下降 1. 6%,而老化 8h后,包覆的荧光粉亮度衰减明显优于不包覆的材料。The plasma display panels (PDPs) are regarded as a medium of large-format panel display. The performance and lifetime of PDPs are strongly related to the nature of phosphors used in it. The working of PDPs is realized by a conversion of vacuum ultraviolet (VUV) light to visible light. VUV light has higher (energy) than that of the ultraviolet (UV) light used as the excitation source of conventional lamp phosphors, therefore, the surface morphology of PDP phosphors suffering from VUV radiation is damaged, and the (luminescent) performance is (decreased) with PDPs working time, thus shortening the life of PDPs. This indicates that PDP phosphors should not only have high luminescent efficiency, but also are highly resistant to VUV radiation. Obviously, it is (essential) to choose an appropriate coating material to resist the VUV radiation. In this work, BaAl_(12)O_(19)∶Mn^(2+) powders were prepared by the conventional solid-reaction method. MgF_2 was coated at the surface of BaAl_(12)O_(19)∶Mn^(2+) powders by the emulsion method. Some factors, such as reagent concentration and reaction procedure, were investigated, the optimal coating conditions and technique were obtained. The structure analysis of surface-modified (BaAl_(12)O_(19)∶)Mn^(2+) powders was performed by XRD,TEM, IR measurements. The phosphor screen was prepared also for the aging measurement. The results indicated that MgF_2 was successfully coated at the surface of BaAl_(12)O_(19)∶Mn^(2+). The luminescent intensity of surface-modified (BaAl_(12)O_(19)∶Mn^(2+)) decreased only 1.6% at the starting. After aging for 8 h, the luminescence decay of surface-modified samples was significantly less than that of non-modified samples.

关 键 词：BaAl12O19:Mn^2+ 荧光粉 表面包覆 MGF2 

分 类 号：O482.31[理学—固体物理]