Studies on the Preparation of Phosphorescent Materials

당광체에 관한 연구

Three systems such as CaS, BaS and ZnS are used as ground materials and transition elements such as Bi, Cu, Ag and Ni are used as activators to preared phosphorescent materials of strong after-grow intensity. These three systems in which we have 31 kinds of different composition samples are heated at given temperatures in the electrical furnace and are cooled in the air in order to crystallize them. In the case of BaS system, the mixture of CaO and purified S is better than the other kinds of calcium compound as the ground materials to crystallize phosphors. In BaS system, the mixture of BaCO$_{3}$ and purified S, in ZnS system ZnS respectively is the most proper ground material to prepare such a strong after-grow intensified phosphors. In a given range, the higher in temperature and the longer time of heating, the better phosphors we obtain.