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US 11,767,471 B2Granted
Adaptive solid-state luminescent phosphors
AssigneeBoard of Supervisors of Louisiana State University and Agricultural and Mechanical College
InventorJames Anthony Dorman
Life of this patent
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Abstract
The absorbance or emission wavelength of composite materials comprising a transition metal doped shell disposed over a rare earth doped core and a functionalizable group on the surface of the transition metal doped shell can change upon subjection to a carboxylic acid. This method of changing the absorbance or emission wavelength of a composite material can be used to identify counterfeit currency using an ink comprising a composite material.
Claims10
A method of changing the absorbance or emission spectrum of a nanoparticle, the method comprising:
- providing a nanoparticle having a rare earth doped core, a transition metal doped shell wherein the transition metal doped shell comprises TiO2, and at least one surface functionalizable group;
- and
- treating the nanoparticle with at least one carboxylic acid;
- wherein the absorbance or emission spectrum of the nanoparticle is changed upon treatment with the carboxylic acid.
1 more element
Dependencies are inferred from the claim text.