Phosphor converted light emitting device

US7038370B2 · kind B2 · utility

Assignee

• Lumileds Lighting US, LLC · US

Inventors

• Regina B. Mueller-Mach · San Jose, US
• Gerd O. Mueller · San Jose, US
• Thomas Juestel · Aachen, DE
• Wolfgang Busselt · Roetgen, DE
• Peter Josef Schmidt · Aachen, DE
• Walter Mayr · Alsdorf, DE

Key dates

• Filing date: Feb 23, 2004
• Grant date: May 2, 2006
• Expiry date: Feb 23, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8512
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A system includes a radiation source capable of emitting first light and a fluorescent material capable of absorbing the first light and emitting second light having a different wavelength than the first light. The fluorescent material is a phosphor having the formula (Lu1-x-y-a-bYxGdy)3(Al1-zGaz)5O12:CeaPrb wherein 0<x<1, 0<y<1, 0<z≦0.1, 0<a≦0.2 and 0<b≦0.1. In some embodiments, the (Lu1-x-y-a-bYxGdy)3(Al1-zGaz)5O12:CeaPrb is combined with a second fluorescent material capable of emitting third light. The second fluorescent material may be a red-emitting phosphor, such that the combination of first, second, and third light emitted from the system appears white.