Processes for preparing color stable manganese-doped complex fluoride phosphors

US9388336B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• James Edward Murphy · Niskayuna, US
• William Winder Beers · Chesterland, US
• Robert Joseph Lyons · Niskayuna, US
• Fangming Du · Northfield, US

Key dates

• Filing date: Dec 12, 2014
• Grant date: Jul 12, 2016
• Expiry date: Dec 12, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing a color stable Mn4+ doped complex fluoride phosphor of formula I includesAx(M(1−m), Mnm)Fy  (I)contacting a first aqueous HF solution comprising (1−m) parts of a compound of formula HxMFy, and a second aqueous HF solution comprising m*n parts of a compound of formula Ax[MnFy], with a third aqueous HF solution comprising (1−n) parts of the compound of formula Ax[MnFy] and a compound of formula AaX, to yield a precipitate comprising the color stable Mn4+ doped complex fluoride phosphor;