The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 2005
Filed:
Jul. 27, 2001
Earl Danielson, Palo Alto, CA (US);
Andries Ellens, Munich, DE;
Frank Jermann, Munich, DE;
Wolfgang Rossner, Holzkirchen, DE;
Martin Devenney, Mountain View, CA (US);
Daniel Giaquinta, Mountain View, CA (US);
Manfred Kobusch, Munich, DE;
Earl Danielson, Palo Alto, CA (US);
Andries Ellens, Munich, DE;
Frank Jermann, Munich, DE;
Wolfgang Rossner, Holzkirchen, DE;
Martin Devenney, Mountain View, CA (US);
Daniel Giaquinta, Mountain View, CA (US);
Manfred Kobusch, Munich, DE;
Osram Opto Semiconductors GmbH, Regensburg, DE;
Symyx Technologies Inc., Santa Clara, CA (US);
Abstract
A device for the generation of specific colored light including white light by luminescent down conversion and additive color mixing based on a light-emitting diode (LED) comprising a semiconductor light-emitting layer emitting near UV light about 370-420 nm or blue light about 420-480 nm and phosphors which absorb completely or partly the light emitted by the light-emitting component and emit light of wavelengths longer than that of the absorbed primary light, wherein the light emitting layer of the light emitting component is preferably a Ga(In)N-based semiconductor; and at least one of the phosphors contains a metal sulfide fluorescent material activated with europium containing at least one element selected from the group consisting of Ba, Sr, Ca, Mg and Zn; and/or at least another phosphor which contains a complex thiometalate fluorescent material activated with either europium, cerium or both europium and cerium containing 1) at least one element selected from the group consisting of Ba, Sr, Ca, Mg and Zn and 2) at least one element selected from the group consisting of Al, Ga, In, Y, La and Gd.