Photolytically and environmentally stable multilayer structure for high efficiency electromagnetic energy conversion and sustained secondary emission
First Claim
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1. A multilayer structure for authentication, said multilayer structure comprising:
- an energy conversion layer that converts energy of a primary electromagnetic radiation to a longer output wavelength, said energy conversion layer comprising;
a polymer and a first photoluminescent material with a first radiation absorption spectrum that at least partially overlaps with the primary electromagnetic radiation;
at least one stability enhancement layer that increases the photolytic and thermal stability of said multilayer structure; and
at least one blocking layer that prevents at least a portion of said energy conversion layer from converting energy of the primary electromagnetic radiation to the longer output wavelength.
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Abstract
A multilayer structure for authentication that includes an energy conversion layer, at least one stability enhancement layer and at least one blocking layer is disclosed. Also disclosed are methods of creating and using the inventive multilayer structure for authentication.
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Citations
48 Claims
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1. A multilayer structure for authentication, said multilayer structure comprising:
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an energy conversion layer that converts energy of a primary electromagnetic radiation to a longer output wavelength, said energy conversion layer comprising; a polymer and a first photoluminescent material with a first radiation absorption spectrum that at least partially overlaps with the primary electromagnetic radiation; at least one stability enhancement layer that increases the photolytic and thermal stability of said multilayer structure; and at least one blocking layer that prevents at least a portion of said energy conversion layer from converting energy of the primary electromagnetic radiation to the longer output wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of fabricating a multilayer structure for authentication, said method comprising:
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forming an energy conversion layer comprising a polymer and a first photoluminescent material with a first absorption spectrum that at least partially overlaps with a primary electromagnetic radiation; overlaying at least one stability enhancement layer over at least one side of said energy conversion layer that increases the photolytic and thermal stability of said multilayer structure; and applying at least one blocking layer into or onto at least a portion of said energy conversion layer to prevent at least a portion of said energy conversion layer from converting the primary electromagnetic radiation to a longer output wavelength. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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40. A method of identifying an object for authentication, said method comprising:
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applying a multilayer structure onto or into at least a portion of the object, said multilayer structure comprising; (i) an energy conversion layer that converts the energy of a primary electromagnetic radiation to a longer output wavelength, and (ii) at least one stability enhancement layer that increases the photolytic and thermal stability of said multilayer structure, and (iii) at least one blocking layer that prevents at least a portion of said energy conversion layer from converting energy of the primary electromagnetic radiation to the longer output wavelength, and wherein said multilayer structure is exposed to the primary electromagnetic radiation and the longer output wavelength is detected. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48)
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Specification