What is it about?
We have developed a system for making invisible markings that become visible as full-color images when illuminated with near-infrared light. These images cannot be seen in room light, or when viewed under a UV lamp.
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Why is it important?
This advance has applications in document and product identification. We have demonstrated, for example, that data can be encoded and read in full-color QR codes.
Read the Original
This page is a summary of: Red-green-blue printing using luminescence-upconversion inks, Journal of Materials Chemistry C, January 2014, Royal Society of Chemistry,
DOI: 10.1039/c3tc32233e.
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