Zinc sulfide electroluminophores and method for production thereof

US7252790B2 · kind B2 · utility

Assignees

• LEUCHTSTOFFWERK BREITUNGEN GMBH · DE
• BUNDESDRUCKEREI GMBH · DE

Inventors

• Frank Kappe · Rheda-Wiedenbrück, DE
• Benedikt Ahlers · Berlin, DE
• Arnim Franz-Burgholz · Berlin, DE
• Hans-Jurgen Limburg · Tiefenort, DE
• Detlef Starick · Berlin, DE
• Monika Voh · Heringen/Helme, DE

Key dates

• Filing date: May 10, 2006
• Grant date: Aug 7, 2007
• Expiry date: May 10, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.