Zinc sulfide electroluminophores and method for production thereof
AssigneesBundesdruckeri GmbH, Leuchtstoffwerk Breitungen GmbH
InventorsFrank Kappe, Benedikt Ahlers, Arnim Franz-Burgholz, Hans-Jürgen Limburg, Detlef Starick, Monika Voh
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Abstract
Zinc sulfide electroluminophores are prepared from solutions of zinc salts with hydrogen sulfide. The zinc sulfide compounds are mixed with activator and coactivator compounds to produce luminophores, and the mixtures are fired in the presence of fixing agents. These fired materials are then treated in an acid bath, washed, neutralized, and optionally filtered and dried.
Claims3
Zinc sulfide electroluminophores which have a cubic crystal structure and average grain sizes of from 2 to 5 microns;
- Wherein the particles comprise zinc sulfide, activator compounds, and coactivator compounds, wherein the particles are coated with a protective layer consisting of an inner metal oxide film and an outer silicon nitrate film.
Zinc sulfide electroluminophores comprising zinc sulfide and activator compounds and coactivator compounds, wherein said electroluminophores have an average grain size of from 5 to 7 microns and a cubic crystal structure, and wherein particles of said zinc sulfide electroluminophores are coated with a protective layer consisting of an inner metal oxide film and an outer silicon nitrate film.
Zinc sulfide electroluminophores comprising zinc sulfide, wherein said electroluminophores have an average grain size of from 5 to 7 microns, and wherein particles of said zinc sulfide electroluminophores are coated with a protective layer consisting of an inner metal oxide film and an outer silicon nitrate film.
Dependencies are inferred from the claim text.