彩色PDP荧光粉的劣化研究

Study on Deterioration of Phosphors for Color PDP

彩色等离子体平板显示器件已经成为信息显示领域重要发展方向之一 ,荧光粉对PDP器件的性能起着决定性的作用。PDP中的荧光粉是通过丝网印刷的方法涂敷的。荧光粉在制成丝网印刷用荧光粉浆料过程中 ,以及制成PDP器件的过程中 ,都可能使荧光粉的性能降低 ,这就是工序劣化。在制成PDP器件后 ,荧光粉的性能还会随着使用时间的延长进一步降低 ,这就是历时劣化。本文分析了荧光粉的工序劣化和历时劣化产生的原因 ,设计制作了单色PDP试验屏 ,采用CRTColorAnalyzer(CA 1 0 0 )测量了荧光粉在PDP器件中的色坐标 ,并与荧光粉生产厂家提供的色坐标进行比较 ,从而获得了荧光粉的工序劣化和历时劣化值。试验结果表明 ,绿粉 (Zn2 SiO4 ∶Mn2 + )和蓝粉 (BaMgAl10 O17∶Eu2 + )的工序劣化较严重 ,蓝粉的历时劣化最严重 ,其y坐标增大 1 0 % ,x坐标增大 5 %。我们认为改进荧光粉浆料成份和配比 ,从而降低荧光粉的烧结温度以及采用比表面积大的荧光粉颗粒 ,有助于改善工序劣化 ;改进MgO的性能 ,提高其溅射能力以及采用新的驱动方法以避免荧光粉遭受离子轰击 。

Color Plasma Display Panels (PDPs) has become one of the important developing trends in the information display field, phosphor is of critical role to the performance of PDPs. The phosphor in PDPs is coated by screen printing method. In the process of making into phosphor paste for screen printing and in the process of fabricating the PDPs, the performance of phosphor might be decreased. This is processing deterioration. After PDPs being finished the performance of phosphor could be decreased further with the continuous operation of PDPs. This is timing deterioration. The causes of occurring processing deterioration and timing deterioration are analyzed. The monocolor experimental PDP is manufactured. Chromaticity coordinates of phosphor in the PDP are measured by the CRT Color Analyzer (CA-100) which are compared with the chromaticity coordinates supplied by the phosphor manufacturer. Much data of processing deterioration and timing deterioration of phosphor is obtained. The experiment results show that (1) the processing deterioration of green phosphor (Zn 2SiO 4∶Mn 2+) and blue phosphor(BaMgAl 10O 17∶Eu 2+) is serious; (2) the timing deterioration of blue phosphor is most serious, y and x coordinate increasing by 10% and 5% respectively. We think (1) amending the phosphor paste ingredients and composition which results in the decrease of sintering temperature of phosphor, and using phosphor with larger specific surface area will be helpful to prevent the phosphors from processing deterioration; (2) amending the performance of MgO to enhance its anti-sputter ability, and using new driving method to prevent the phosphors from ion bombardment is helpful to improve the timing deterioration.