LUMINESCENT COMPOSITIONS, METHODS FOR MAKING LUMINESCENT COMPOSITIONS AND INKS INCORPORATING THE SAME
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Abstract
A particulate luminescent composition is disclosed that, when excited by electromagnetic radiation at a first frequency, emits electromagnetic radiation at a second frequency equal to or within 1500 cm−1 of the first frequency. The luminescent composition comprises substantially spherical particles having a weight average particle size of less than about 10 μm and a particle size distribution such that at least about 90 weight percent of the particles are not larger than twice the average particle size.
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Citations
94 Claims
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1-60. -60. (canceled)
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61. A secure document, comprising:
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a document; and a security taggant comprising a powder batch comprising a luminescent composition that, when excited by electromagnetic radiation at a first frequency, emits electromagnetic radiation at a second frequency equal to or within 1500 cm−
1 of the first frequency. - View Dependent Claims (62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77)
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78. A luminescent ink, comprising:
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(a) a liquid vehicle phase; and (b) a functional phase dispersed throughout the liquid phase, the functional phase comprising a powder batch comprising a luminescent composition that, when excited by electromagnetic radiation at a first frequency, emits electromagnetic radiation at a second frequency equal to or within 1500 cm−
1 of the first frequency. - View Dependent Claims (79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94)
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Specification