Refractive index matched phosphors and substrates for security applications
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United States of America Patent
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May 21, 2013
Grant Date -
Jun 23, 2011
app pub date -
Dec 13, 2010
filing date -
Dec 17, 2009
priority date (Note) -
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Abstract
Phosphor compositions are provided that can be incorporated into or onto plastic substrates as covert security features. The plastic substrates can be transparent and the phosphor compositions have a refractive index that effectively matches the refractive index of the plastic substrate to maintain the transparency. The phosphor compositions have absorption in the infrared, thus enabling excitation and detection of the compositions with an infrared emitting source.
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