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Color Electroluminescent Devices Prepared by Metal Organic Chemical Vapor Deposition

This paper discusses the preparation of AC thin film ZnS:Tb (green), Sm (red) and Tm (blue) color electroluminescent devices by metal organic chemical vapor deposition, using dimethylzinc and H2S as source gases. A new doping method for luminescent centers was used. This was accomplished by evaporating TbF3, SmF3 SmCl3 and TmF3 after they had been heated to their melting points during the growth of ZnS in a MOCVD reactor. The maximum brightnesses of ZnS:TbF3, ZnS:SmCl3 and ZnS:TmF3 are 5000, 1000 and 10 cd/m2. The ZnS:SmCl3 EL devices showed a deeper red chromaticity than the ZnS:SmF3 EL ones.