ELECTROLUMINESCENCE STUDY OF ZnS: Sm, Li PHOSPHOR USING SOLID STATE REACTION METHOD

In the present work we have attempted to study the electroluminescent (EL) properties of ZnS: Sm, Li luminophor.The phosphor is synthesized using solid state reaction method. A comparative study has been made for electroluminescent emission characteristics of five samples viz ZnS:Cu,Li, ZnS:Sm, ZnS:Sm,Cl; ZnS:Sm,Li; ZnS:Cu,Sm,Li. It is observed that the intensity of brightness varies with the applied voltage and excitation frequency according to the universal laws and color of emission is found to be greenish. Li is found to enhance the EL intensity of ZnS: Sm phosphor. Structural studies using XRD have also been performed. The average grain size of ZnS: Sm, Li is estimated to be 38.9µ