South Dakota Board of Regents

Aravind Baride

William Cross

Jon Kellar

Jeevan Meruga

P Stanley May

David Langerman

Julian Brackins

John Rapp

An improved system and method for reading an upconversion response from nanoparticle inks is provided. A is adapted to direct a near-infrared excitation wavelength at a readable indicia, resulting in a near-infrared emission wavelength created by the upconverting nanoparticle inks. A short pass filter may filter the near-infrared excitation wavelength. A camera is in operable communication with the short pass filter and receives the near-infrared emission wavelength of the readable indicia. The system may further include an integrated circuit adapted to receive the near-infrared emission wavelength from the camera and generate a corresponding signal. A readable application may be in operable communication with the integrated circuit. The readable application receives the corresponding signal, manipulates the signal, decodes the signal into an output, and displays and/or stores the output.

Reader apparatus for upconverting nanoparticle ink printed images

The present technology relates generally to a stable oil-in-water emulsion containing upconverting nanoparticles. In particular, the present technology relates to an ink formulation comprising a stable oil-in-water emulsion of upconverting nanoparticles useful for security printing. Preferably the upconverting nanoparticles comprise a &#x3b2;-Na(RE)Fnanoparticle, wherein RE is a lanthanide, yttrium, or a combination or mixture thereof.

Stable oil-in-water nanoemulsion containing upconverting nanoparticles

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Rapid City, SD, United States of America

Aravind Baride