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:
Jan. 05, 2010
Filed:
Mar. 21, 2007
John Varadarajan, Fremont, CA (US);
Mirna Resan, San Jose, CA (US);
Fanxin Wu, Sunnyvale, CA (US);
William M. Pfenninger, Fremont, CA (US);
Nemanja Vockic, San Jose, CA (US);
John Kenney, Palo Alto, CA (US);
John Varadarajan, Fremont, CA (US);
Mirna Resan, San Jose, CA (US);
Fanxin Wu, Sunnyvale, CA (US);
William M. Pfenninger, Fremont, CA (US);
Nemanja Vockic, San Jose, CA (US);
John Kenney, Palo Alto, CA (US);
Ultradots, Inc., Menlo Park, CA (US);
Abstract
Luminescent materials and the use of such materials in anti-counterfeiting, inventory, photovoltaic, and other applications are described herein. In one embodiment, a luminescent material has the formula: [ABXX'X″][dopants], wherein A is selected from at least one of elements of Group IA; B is selected from at least one of elements of Group VA, elements of Group IB, elements of Group IIB, elements of Group IIIB, elements of Group IVB, and elements of Group VB; X, X′, and X″ are independently selected from at least one of elements of Group VIIB; the dopants include electron acceptors and electron donors; a is in the range of 1 to 9; b is in the range of 1 to 5; and x, x′, and x″ have a sum in the range of 1 to 9. The luminescent material exhibits photoluminescence having: (a) a quantum efficiency of at least 20 percent; (b) a spectral width no greater than 100 nm at Full Width at Half Maximum; and (c) a peak emission wavelength in the near infrared range.