Omnidirectional high chroma red structural color with combination semiconductor absorber and dielectric absorber layers
First Claim
1. An omnidirectional high chroma red structural color comprising:
- a multilayer stack having;
a reflective core layer;
a semiconductor absorber layer extending across said reflective core layer;
a dielectric absorber layer extending across said semiconductor absorber layer; and
a high index of refraction dielectric layer extending across said dielectric absorber layer, said high index of refraction dielectric layer having a thickness D that obeys the relation 0.1 QW<
D≦
4 QW where QW is a quarter wave thickness for a target wavelength, said target wavelength having a predefined hue between 0-40°
on an a*b* Lab color map;
said multilayer stack reflecting a single band of visible light with said predefined hue between 0-40°
on said a*b* Lab color map, said single band of visible light having a hue shift within said predefined hue between 0-40°
on said a*b* Lab color map when viewed from all angles between 0-45°
normal to an outer surface of said multilayer stack.
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Abstract
A high-chroma omnidirectional red structural color pigment. The omnidirectional structural color pigment is in the form of a multilayer stack that has a reflective core layer, a semiconductor absorber layer extending across the reflective core layer, a dielectric absorber layer extending across the semiconductor absorber layer and a high index of refraction dielectric layer extending across the dielectric absorber layer. The multilayer stack reflects a single band of visible light with a hue between 0-40°, and preferably between 10-30°, on an a*b* Lab color map. The single band of visible light has a hue shift of less than 30° on the a*b* Lab color map when viewed from all angles between 0-45° normal to an outer surface of the multilayer stack.
195 Citations
19 Claims
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1. An omnidirectional high chroma red structural color comprising:
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a multilayer stack having; a reflective core layer; a semiconductor absorber layer extending across said reflective core layer; a dielectric absorber layer extending across said semiconductor absorber layer; and a high index of refraction dielectric layer extending across said dielectric absorber layer, said high index of refraction dielectric layer having a thickness D that obeys the relation 0.1 QW<
D≦
4 QW where QW is a quarter wave thickness for a target wavelength, said target wavelength having a predefined hue between 0-40°
on an a*b* Lab color map;said multilayer stack reflecting a single band of visible light with said predefined hue between 0-40°
on said a*b* Lab color map, said single band of visible light having a hue shift within said predefined hue between 0-40°
on said a*b* Lab color map when viewed from all angles between 0-45°
normal to an outer surface of said multilayer stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A process for making an omnidirectional high chroma red structural color, the process comprising:
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manufacturing a multilayer stack by; dry depositing a reflective core layer; dry depositing a semiconductor absorber layer that extends across the reflective core layer; dry or wet depositing a dielectric absorber layer that extends across the semiconductor absorber layer; and dry or wet depositing a high index of refraction dielectric layer that extends across the dielectric absorber layer, the high index of refraction dielectric layer having a thickness D that obeys the relation 0.1 QW<
D≦
4 QW where QW is a quarter wave thickness for a target wavelength having a predefined hue between 0-40°
on an a*b* Lab color map;the multilayer stack reflecting visible light with the predefined hue between 0-40°
on the a*b* Lab color map and having a hue shift within the predefined hue between 0-40°
on the a*b* Lab color map when viewed from all angles between 0-45°
normal to an outer surface of the multilayer stack. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification