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:
Oct. 27, 2015
Filed:
Mar. 03, 2011
Rifat Ata Mustafa Hikmet, Eindhoven, NL;
Jan Cornelis Kriege, Mierlo, NL;
Johannes Franciscus Maria Cillessen, Deurne, NL;
René Theodorus Wegh, Veldhoven, NL;
Rifat Ata Mustafa Hikmet, Eindhoven, NL;
Jan Cornelis Kriege, Mierlo, NL;
Johannes Franciscus Maria Cillessen, Deurne, NL;
René Theodorus Wegh, Veldhoven, NL;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
The invention relates to a lighting apparatus comprising a conversion material () for converting primary light () into secondary light (), wherein the conversion material () comprises converting photolummescent material (), which degrades to non-converting photolummescent material over time when the conversion material () is illuminated by the primary light (). The conversion material () is adapted such that, when the conversion material () is illuminated by the primary light (), the relative decrease in concentration of the converting photolummescent material () within the conversion material () is larger than the relative decrease in intensity of the secondary light (). This allows the lighting apparatus to provide an only slightly reduced absorbance of the primary light, even if a large part of the photolummescent material has been bleached, and thus a longer lifetime, with the same or a slightly reduced intensity of the secondary light.