Phosphor system for improved efficacy lighting sources

US8866372B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• William Winder Beers · Chesterland, US
• Jon Bennett Jansma · Pepper Pike, US
• Fangming Du · Northfield, US
• William Erwin Cohen · Solon, US
• Alok Mani Srivastava · San Francisco, US
• Samuel Joseph Camardello · Niskayuna, US
• Holly Ann Comanzo · Niskayuna, US

Key dates

• Filing date: Dec 5, 2011
• Grant date: Oct 21, 2014
• Expiry date: Dec 5, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J61/72
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

Mercury vapor discharge fluorescent lamps are provided. The lamp can include a lamp envelope enclosing a discharge space and having an inner surface. First and second electrodes can be positioned on the lamp, such as on opposite ends of the lamp envelope. An ionizable medium that includes mercury and an inert gas can be within said lamp envelope. A phosphor layer can be on the inner surface of the lamp envelope. The phosphor layer generally includes a phosphor blend of a calcium halophosphor, a blue phosphor having an emission peak at about 440 nm to about 490 nm, a blue-green phosphor having an emission peak at about 475 nm to about 530 nm, and a red phosphor having an emission peak at about 600 nm to about 650 nm.