Multi-grain luminescent ceramics for light emitting devices

US7902564B2 · kind B2 · utility

Assignees

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL
• Philips Lumileds Lighting Company LLC · US

Inventors

• Regina B. Mueller-Mach · San Jose, US
• Gerd O. Mueller · San Jose, US
• Michael R. Krames · Los Altos, US
• Peter Josef Schmidt · Aachen, DE
• Hans-Helmut Bechtel · Roetgen, DE

Key dates

• Filing date: Dec 22, 2006
• Grant date: Mar 8, 2011
• Expiry date: Aug 26, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S250/909
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A ceramic body is disposed in a path of light emitted by a light source. The light source may include a semiconductor structure comprising a light emitting region disposed between an n-type region and a p-type region. The ceramic body includes a plurality of first grains configured to absorb light emitted by the light source and emit light of a different wavelength, and a plurality of second grains. For example, the first grains may be grains of luminescent material and the second grains may be grains of a luminescent material host matrix without activating dopant.