Quantum dots, semiconductor nanocrystals and semiconductor particles used as fluorescent coding elements
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United States of America Patent
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Oct 14, 2003
Grant Date -
Oct 25, 2001
app pub date -
Mar 7, 2001
filing date -
Mar 7, 2000
priority date (Note) -
Expired
status (Latency Note)
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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.
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