Core-shell particles and methods of making and using thereof
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsFrank Gu, Paul Chen, Harish Krishnakumar
Life of this patent
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Abstract
Described are core-shell particles which exhibit tunable photophysical properties, allowing them to absorb, scatter, and/or extinguish specific wavelengths of light (e.g., specific wavelengths of blue light). The core-shell particles can be incorporated as tunable optical filters in optically transparent substrates to produce devices, including ophthalmic devices such as contact lenses.
Claims70
A population of core-shell particles, each of the core-shell particles comprising:
- a plasmonic nanoparticle core comprising a noble metal;
- and
- a shell comprising a dielectric material surrounding the plasmonic nanoparticle core;
- wherein the population of core-shell particles exhibits a maximum absorption value in a range of from 400 nm to 500 nm;
- and
- wherein the population of core-shell particles exhibits an absorption spectrum having a full-width at half maximum of from 20 nm to 75 nm.
A population of core-shell particles, each of the core-shell particles comprising:
- a plasmonic nanoparticle core comprising silver;
- and
- a shell comprising silicon dioxide surrounding the plasmonic nanoparticle core;
- wherein the plasmonic nanoparticle cores have an average particle size and the shells have an average thickness;
- and
- wherein the ratio of the average particle size to the average thickness is from 1:5 to 20:1, as measured by transmission electron microscopy (TEM).
An optically transparent material comprising:
- a substrate;
- and
- a population a population of core-shell particles disposed within the substrate, each of the core-shell particles comprising:
- (i) a silver core;
- and
- (ii) a non-metallic shell comprising a dielectric material surrounding the silver core.
An optically transparent material comprising:
- a substrate;
- and
- a population a population of core-shell particles disposed within the substrate, each of the core-shell particles comprising:
- (i) a plasmonic nanoparticle core comprising a noble metal;
- and
- (ii) a non-metallic shell comprising a dielectric material surrounding the plasmonic nanoparticle core
- wherein the population of core-shell particles exhibits a maximum absorption value in a range of from 400 nm to 500 nm.
The lens of claim 67, wherein the lens comprises an eyeglass lens.
Dependencies are inferred from the claim text.