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:
May. 01, 2012
Filed:
Jun. 02, 2009
Thomas Vogt, Chapin, SC (US);
Sangmoon Park, Busan, KR;
Thomas Vogt, Chapin, SC (US);
Sangmoon Park, Busan, KR;
University of South Carolina, Columbia, SC (US);
Abstract
A light emitting device comprising a light producing element configured to generate ultraviolet light having a wavelength of from about 250 nm to about 400 nm and a self-activating phosphor comprising an ordered oxyfluoride compound is provided. The nitrogen-free or nitrogen-containing ordered oxyfluoride compound has a formula:ARMOF—Nwhere A is Sr alone or Sr mixed with Ba and/or Ca such that A comprises at least about ⅔ mole % of Sr and up to about ⅓ mole percent of Ba and/or Ca; R is a rare earth element or a mixture of rare earth elements; M is Al, Ga, In, W, Mo, Bi, or mixtures thereof; 0<a≦0.3; δ1 and δ2 are both from about 0.01 to about 0.1; and 0≦w≦0.05 such that 0≦w'≦0.1 and 0≦w″≦0.15. The ultraviolet light excites the self-activating phosphor such that the self-activating phosphor emits visible light having a wavelength of from about 380 to about 750 nm.