Color stable red-emitting phosphors

US11098246B2 · kind B2 · utility

Assignee

• CURRENT LIGHTING SOLUTIONS, LLC · US

Inventors

• James Edward Murphy · Niskayuna, US
• Anant Achyut Setlur · Niskayuna, US
• Florencio Garcia · Schenectady, US
• Robert Joseph Lyons · Niskayuna, US
• Ashfaqul Islam Chowdhury · Broadview Heights, US
• Nagaveni Karkada · Bengaluru, IN
• Prasanth Kumar Nammalwar · Savanuru, IN
• William Winder Beers · Chesterland, US

Key dates

• Filing date: Mar 6, 2019
• Grant date: Aug 24, 2021
• Expiry date: Mar 6, 2039

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/181
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A lighting apparatus includes a semiconductor light source in direct contact with a polymer composite comprising a color stable Mn4+ doped phosphor, wherein the lighting apparatus has a color shift of ≤1.5 MacAdam ellipses after operating for at least 2,000 hour at a LED current density greater than 2 A/cm2, a LED wall-plug efficiency greater than 40%, and a board temperature greater than 25° C.