Submicronic barium and magnesium aluminate phosphors

US8580150B2 · kind B2 · utility

Assignee

• RHODIA OPERATIONS · FR

Inventors

• Valérie Buissette · Paris, FR
• Thierry Le-Mercier · Rosny-sous-Bois, FR
• Laurent Thiers · Savigny-sur-Orge, FR
• Yvan Montardi · Cormeilles-en-Parisis, FR
• Olivier Le-Roux · Rosny-sous-Bois, FR

Key dates

• Filing date: Mar 10, 2009
• Grant date: Nov 12, 2013
• Expiry date: Feb 28, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/64
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Submicronic barium and magnesium aluminates, useful as phosphors, are in the form of a liquid-phase suspension of substantially monocrystalline particles having an average particle size ranging from 80 to 400 nm; such aluminates are prepared by a process that includes: providing a liquid mixture containing compounds of aluminum and of other elements that are part of the aluminate composition; drying the mixture by atomization; calcining the dried product in a reducing atmosphere and wet-grinding this product.