FAAS测定铜对CaS DCEL粉末包铜工艺的指导

FAAS for Improvement in Process of Copper-Coating by Terminating Copper on CaS DCEL Powder

利用火焰原子吸收光谱法（ＦＡＡＳ），建立了以ＣａＳ为基质的粉末发光材料，包钢量的定量分析方法，回收率和相对标准偏差分别为９９．４～１００．６与０．４％。在准确度满足工艺要求的情况下，通过分析得到的测试数据及曲线，给出了在包钢过程中，包铜液的浓度，温度，时间等参数对包钢量的影响，改进了操作模式，使材料的性能得到了提高。

CaS dopped with rare-earth ions as a kink of powder phosphors has higher luminescent intensity and quantum efficiency. It is also considered CaS phosphors to be direct current electroluminescent material. It is known that in order to be excited by direct current, DCEL phosphor must be covered with surface conducting layer. So the copper-coating process (forming the surface p-type CuxS conducting layer) is important to DCEL. In this paper, a FAAS (Fire atom absorption spectrum) method is used to determine the copper content in the surface of CaS DCEIL powder. The rate of recovery and the relative standard deviation of this method are 99. 4 % - 100. 6 %, and 0. 4 %, respectively. The dependence of copper-coating volume on the solution concentration, solution temperature and the processing time was studied experimentally as volume of solution was definite. When temperature of solution and processing time are defined (60), 10min), fig. 1 shows that the greater part of copper ions are changed into CuxS surface-phase when concentration of copper ions is lower, but when its concentration becomes higher, copper-coating volume is saturated. When processing time and concentration of adding copper ions are selected (10min, 10mg' g- 1 ), fig. 2 shows that copper-coating volume increases with temperature. As temperature goes on the copper-coating volume is adjacent to the content of adding copper ions. Fig. 3 shows that the copper-coating volume increases with the increasing of COPper-coating process time and gradually goes to saturate and that speed of this process is gradually slower down (60℃,1. 5ing). By means of this method, the preparation process and electroluminescence (EL) properties of CAS were improved.