Coated red line emitting phosphors

US11149195B2 · kind B2 · utility

Assignee

• CURRENT LIGHTING SOLUTIONS, LLC · US

Inventors

• Digamber Gurudas Porob · Savanuru, IN
• Prasanth Kumar Nammalwar · Savanuru, IN
• Srinidhi Ramachandra · Bengaluru, IN
• Matthew David Butts · Rexford, US
• James Edward Murphy · Niskayuna, US

Key dates

• Filing date: Nov 15, 2017
• Grant date: Oct 19, 2021
• Expiry date: Jul 13, 2038

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 coating a phosphor of formula I: Ax[MFy]:Mn4+ includes combining the phosphor of formula I in particulate form with a first solution including a compound of formula II: Ax[MFy] to form a suspension and combining a second solution with the suspension, the second solution including a precursor including an element selected from the group consisting of calcium, strontium, magnesium, yittrium, barium, scandium, lanthanum, and combinations thereof. A population of particles having a core including a phosphor of formula I and a manganese-free composite coating disposed on the core, and a lighting apparatus (10) including the population of particles are also presented.