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:
Apr. 17, 2007
Filed:
May. 27, 2003
Thomas Jüstel, Aachen, DE;
Walter Mayr, Alsdorf, DE;
Cornelis Reinder Ronda, Aachen, DE;
Volker Dirk Hildenbrand, Eindhoven, NL;
Thomas Jüstel, Aachen, DE;
Walter Mayr, Alsdorf, DE;
Cornelis Reinder Ronda, Aachen, DE;
Volker Dirk Hildenbrand, Eindhoven, NL;
Koninklijke Philips Electronics, N.V., Eindhoven, NL;
Abstract
An ultraviolet reflecting layer and a fluorescent lamp is described, comprising an envelope having an inner surface, means within the lamp envelope for generating ultraviolet radiation, a light emitting layer of a luminescent material for generating visible light when impinged by ultraviolet radiation, and said ultraviolet reflecting layer, located between the light emitting layer and the inner surface of the lamp envelope, wherein the ultraviolet reflecting layer comprises a metal phosphate and/or a metal borate, with the metal being selected from Sc, Y, La, Gd, Lu and Al, or combinations thereof. The phosphates or borates used in the ultraviolet reflecting layer may optionally be doped by a Tb3+ and/or Dy3+ activator, to further improve the quantum yield of the conversion of UV radiation into visible light.