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:
Sep. 06, 2005
Filed:
Jul. 11, 2003
Alok Mani Srivastava, Niskayuna, NY (US);
Holly Ann Comanzo, Niskayuna, NY (US);
Thomas Francis Mcnulty, Ballston Lake, NY (US);
Alok Mani Srivastava, Niskayuna, NY (US);
Holly Ann Comanzo, Niskayuna, NY (US);
Thomas Francis McNulty, Ballston Lake, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
There is provided white light illumination system including a radiation source, a first luminescent material having a peak emission wavelength of about 575 to about 620 nm, a second luminescent material having a peak emission wavelength of about 495 to about 550 nm, which is different from the first luminescent material and a third luminescent material having a peak emission wavelength of about 420 to about 480 nm, which is different from the first and second luminescent materials. The LED may be a UV LED and the luminescent materials may be a blend of three or four phosphors. The first phosphor may be an orange emitting Eu, Mnactivated strontium pyrophosphate, SrPO:Eu, Mn. The second phosphor may be a blue-green emitting Euactivated barium silicate, (Ba,Sr,Ca)SiO:Eu. The third phosphor may be a blue emitting SECA phosphor, (Sr,Ba,Ca)(PO)Cl:Eu. Optionally, the fourth phosphor may be a red emitting Mnactivated magnesium fluorogermanate, 3.5MgO*0.5MgF*GeO:Mn. A human observer perceives the combination of the orange, blue-green, blue and/or red phosphor emissions as white light.