Strontium phosphor blends having high CRI

US9018830B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Fangming Du · Northfield, US
• William Winder Beers · Chesterland, US
• Jon Bennett Jansma · Pepper Pike, US
• William Erwin Cohen · Solon, US

Key dates

• Filing date: Sep 28, 2011
• Grant date: Apr 28, 2015
• Expiry date: Jan 19, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J61/35
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A fluorescent lamp is provided including a phosphor blend comprising less than about 10% by weight rare earth phosphor, based on the total weight of the phosphor composition. This phosphor blend, when coated on a lamp, provides a lamp that exhibits high color rendering index (CRI), of at least 87, while simultaneously achieving low CCT, of less than about 4500K, i.e. of between about 3000K and 4500K. The phosphor system provided includes a non-rare earth strontium red broad band phosphor, a non-rare earth blue broad band halophosphor, and a rare earth-doped green-blue emitting phosphor, more specifically, a combination of SAR and blue-halo non-rare earth phosphors, and less than 20 wt % BAMn phosphor, based on the total weight of the phosphor system.