Core shell phosphor and method of making the same

US8865305B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Digamber Gurudas Porob · Savanuru, IN
• Alok Mani Srivastava · San Francisco, US
• Holly Ann Comanzo · Niskayuna, US
• Gopi Chandran Ramachandran · Savanuru, IN
• Prasanth Kumar Nammalwar · Savanuru, IN

Key dates

• Filing date: Jun 16, 2010
• Grant date: Oct 21, 2014
• Expiry date: Oct 20, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2989
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A method of making a core-shell phosphor is provided. The method comprises mixing a lanthanum phosphate (LaPO4) core with a shell precursor mixture comprising at least one compound of La, at least one compound of Ce, and at least one compound of Tb to form a core+shell precursor mixture, heating the core+shell precursor mixture to a temperature in a range from about 900° C. to about 1200° C. with an inorganic flux material in presence of a reductant to provide a heated core+shell precursor mixture, cooling the heated core+shell precursor mixture to ambient temperature to provide a product core-shell phosphor dispersed in the inorganic flux material; and separating the product core-shell phosphor from the inorganic flux material.