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. 14, 2003
Filed:
Mar. 07, 2001
Nabil M. Lawandy, North Kingstown, RI (US);
Spectra Science Corporation, Providence, RI (US);
Abstract
A method is disclosed for obtaining information about an object, as is a system operating in accordance with the method. The method includes steps of (a) placing a plurality of regions onto the object, each region being capable of emitting a predetermined wavelength of light; (b) detecting the light; and (c) decoding information from the detected light. At least one of the regions contains semiconductor particles having a radius larger than a quantum dot radius for a corresponding semiconductor material, and a chemical composition selected to provide the predetermined wavelength of light. The semiconductor material contains at least one of a Group II-IV alloy, or a Group III-V alloy, or a compound comprised of an indirect bandgap material, such as Si or Ge. The concentrations of the alloy or compound constituent elements are preselected to provide the predetermined emission wavelength. The semiconductor material may further include a selected dopant.