Controlling the detectability of an article and method for authenticating the article
First Claim
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1. A cascading phosphor comprising:
- a) a host material; and
b) at least three rare earth active ions substituted into the host material to form the cascading phosphor;
wherein, when the cascading phosphor is irradiated with incident radiation, said first active ion transfers energy to said second active ion and said second active ion transfers energy to said third active ion, and at least one of the active ions produces a luminescent emission having a wavelength of at least about 1700 nm.
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Abstract
Cascading phosphors are described herein that produce emissions when they are excited by incident radiation. The cascading phosphors can be applied to articles, and can be useful in authenticating the article. The cascading phosphors include a host and at least three active ions.
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Citations
16 Claims
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1. A cascading phosphor comprising:
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a) a host material; and b) at least three rare earth active ions substituted into the host material to form the cascading phosphor; wherein, when the cascading phosphor is irradiated with incident radiation, said first active ion transfers energy to said second active ion and said second active ion transfers energy to said third active ion, and at least one of the active ions produces a luminescent emission having a wavelength of at least about 1700 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification