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US 12,736,728 B2Granted
Three-layered structural color multilayer structures
AssigneesToyota Motor Engineering & Manufacturing North America, Inc., Toyota Jidosha Kabushiki Kaisha
InventorsSongtao Wu, Debasish Banerjee, Minjuan Zhang
Life of this patent
Estimating the term…
Abstract
A multilayer structure that reflects color includes a core layer, and a conformal dielectric layer encapsulating the core layer. A conformal absorber layer encapsulates the conformal dielectric layer. The multilayer structure consists of three optical layers.
Claims18
A multilayer structure that reflects color comprising:
- a core layer;
- a conformal dielectric layer encapsulating the core layer, the conformal dielectric layer having a thickness between 5 nm and 500 nm;
- and
- a conformal absorber layer encapsulating the conformal dielectric layer, the conformal absorber layer having a thickness between 2 nm and 50 nm, wherein
- each of the core layer, the conformal dielectric layer, and the conformal absorber layer individually has a surface area less than or equal to 100 m2/g, and wherein
- the multilayer structure consists of three optical layers,
- the multilayer structure reflects a single narrow band of visible light when exposed to broadband electromagnetic radiation, the single narrow band of visible light comprising:
- a color shift of the single narrow band of visible light is less than 30° measured in Lab color space when the multilayer structure is exposed to broadband electromagnetic radiation and viewed from angles between 0° and 45° relative to a direction normal to an outer surface of the multilayer structure.
5 more elements
A method for forming a multilayer structure comprising a core layer, a conformal dielectric layer, and a dielectric layer, the method comprising:
- depositing the conformal dielectric layer onto the core layer by chemical vapor deposition (CVD) or atomic layer deposition (ALD), wherein the conformal dielectric layer has a thickness between 5 nm and 500 nm;
- and
- depositing the conformal absorber layer onto the conformal dielectric layer by ALD, wherein the conformal absorber layer has a thickness between 2 nm and 50 nm, wherein
- the multilayer structure consists of three optical layers,
- the multilayer structure reflects a single narrow band of visible light when exposed to broadband electromagnetic radiation, the single narrow band of visible light comprising:
- a color shift of the single narrow band of visible light is less than 30° measured in Lab color space when the multilayer structure is exposed to broadband electromagnetic radiation and viewed from angles between 0° and 45° relative to a direction normal to an outer surface of the multilayer structure.
3 more elements
A multilayer structure that reflects color comprising:
- a core layer;
- a conformal dielectric layer encapsulating the core layer, the conformal dielectric layer having a thickness between 5 nm and 500 nm;
- and
- a conformal absorber layer encapsulating the conformal dielectric layer, the conformal absorber layer having a thickness between 2 nm and 50 nm, wherein
- each of the core layer, the conformal dielectric layer, and the conformal absorber layer individually has a pore volume that is less than or equal to 0.030 cm3/g, and wherein
- the multilayer structure consists of three optical layers,
- the multilayer structure reflects a single narrow band of visible light when exposed to broadband electromagnetic radiation, the single narrow band of visible light comprising:
- a color shift of the single narrow band of visible light is less than 30° measured in Lab color space when the multilayer structure is exposed to broadband electromagnetic radiation and viewed from angles between 0° and 45° relative to a direction normal to an outer surface of the multilayer structure.
5 more elements
Dependencies are inferred from the claim text.