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Quantum dots, semiconductor nanocrystals and semiconductor particles used as fluorescent coding elements

  • US 6,633,370 B2
  • Filed: 03/07/2001
  • Issued: 10/14/2003
  • Est. Priority Date: 03/07/2000
  • Status: Expired due to Fees
First Claim
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1. A method for obtaining information about an object, comprising steps of:

  • placing a plurality of regions onto the object, each region emitting a predetermined wavelength of light;

    detecting the light; and

    decoding information from the detected light, wherein at least one region is comprised of 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, where the semiconductor material is comprised of one of a Group II-VI alloy, or a Group III-V alloy, or a compound comprised of an indirect bandgap material, and wherein the concentrations of the alloy or compound constituent elements are preselected to provide the predetermined emission wavelength.

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