X-ray studies and luminescence of ZnS-phosphor doped with silver and cobalt

Abstract

Measurements were carried out on a series of (ZnS :Ag : Co) with different concentrations of cobalt. The emission spectra were studied at liquid nitrogen and room temperatures. Introducing cobalt dopant into the lattice decreased the efficiency of emission for the first band but produced no shift in the maximum intensity. This phenomenon has been noted by other workers. The approximate average internuclear spacing between activator atoms in hexagonal (ZnS : Ag : Co) was calculated. It is apparent that the average distance between the cobalt atoms for lower concentrations is too large compared with the average distance between the silver atoms. A Siemens D-500 X-ray diffractometer was used to clarify the characteristic features of the phases and the crystallite size estimation.