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《Chinese Journal of Luminescence》 2005-01
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Synthesis and Characterization of Surface-modified BaAl_(12)O_(19)∶Mn~(2+)

WANG Xiao-jun~1, DUAN Gui-hua~2, ZHAO Xiao-xia~1, ZHAO Xue-ping~3, CUI Yu-ming~2, SHEN Lian-chun~2, XIE Yi-hua~1, YANG Hua~2(1. Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China;2. College of Chemistry, Jilin University, Changchun 130023, China;3. College of Physics, Jilin University, Changchun, 130023, China)  
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.
【Fund】: 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
【CateGory Index】: O482.31
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