Patent · US Expired

Illumination system comprising a radiation source and a fluorescent material

US7573189B2 · kind B2 · utility

6Cited by

2References

11Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Thomas Juestel · Aachen, DE
Wolfgang Busselt · Roetgen, DE
Peter Josef Schmidt · Aachen, DE
Walter Mayr · Alsdorf, DE

Key dates

Filing date	Mar 5, 2004
Grant date	Aug 11, 2009
Priority date	—
Expiry date	Aug 19, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH10H20/8512
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention relates to an illumination system comprising a radiation source and a fluorescent material comprising at least one phosphor capable of absorbing a portion of the light emitted by the radiation source and emitting light of a wavelength different from that of the absorbed light; wherein said at least one phosphor is a green-emitting cerium-activated lutetium-aluminum-garnet of general 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. The invention also relates to with a green-emitting cerium-activated lutetium-aluminum-garnet of general 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.