Color Electroluminescent Devices Prepared by Metal Organic Chemical Vapor Deposition

Abstract

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.