By coprecipitation of ZnS and MnS in excess of Na2S, luminescent centres are built differing considerably from those in zinc salt excess. ESR data give evidence of centres of Td symmetry.
ChemInform Abstract A yellow emitting phosphor with band maximum at 590-595 nm is prepared by coprecipitation of ZnS and MnS using an excess of Na2S. The ESR spectrum of this phosphor shows the well known sextett characteristic for Mn2+ ions in tetrahedral environment (i.e. Td-symmetry) as observed for the fired ZnS-Mn phosphor. When an excess of the Zn salt is used in the cold activation process, an orange emitting phosphor is obtained which has a more complicated ESR spectrum.
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