Phosphor converted light emitting device

US7671529B2 · kind B2 · utility

Assignee

• Philips Lumileds Lighting Company LLC · US

Inventors

• Gerd O. Mueller · San Jose, US
• Regina B. Mueller-Mach · San Jose, US
• Joerg Meyer · Wagenfeld, DE
• Peter Josef Schmidt · Aachen, DE
• Detlef Uwe Wiechert · Alsdorf, DE

Key dates

• Filing date: Dec 10, 2004
• Grant date: Mar 2, 2010
• Expiry date: Jul 21, 2028

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8513
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A semiconductor light emitting device is combined with a wavelength converting material. The semiconductor light emitting device is configured to emit first light of a first peak wavelength. The wavelength converting material is configured to absorb at least a portion of the first light and emit second light of a second peak wavelength. In some embodiments, the first wavelength converting material is (Ba1-xSrx)2-y-0.5zSi5N8-zOz:Euy2+ where 0.2<x<0.3, (Ba1-xCax)2-y-0.5zSi5N8-zOz:Euy2+ where 0.01<x<0.2, or M2Si5-aAaN8-aOa:Eu2+ where M=Sr, Ba, Ca; A=Al, B, Ga, Sc; and 0.01<a<0.2.