Omnidirectional high chroma red structural color with semiconductor absorber layer
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorDebasish Banerjee
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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, and a high index of refraction dielectric layer extending across the semiconductor 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.
Claims20
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;
- and
- a high index of refraction dielectric layer extending across said semiconductor absorber layer;
- said multilayer stack reflecting a single band of visible light with a hue between 0-40° on an a*b* Lab color map, said single band of visible light having a hue shift within said 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.
A process for making an omnidirectional high chroma red structural color, the process comprising:
- manufacturing a multilayer stack by:
- dry depositing a reflective core layer;
- dry depositing a semiconductor absorber layer that extends across the reflective core layer;
- and
- wet depositing a high index of refraction dielectric layer that extends across the semiconductor absorber layer;
- the multilayer stack reflecting visible light with a hue between 15-40° on an a*b* Lab color map and having a hue shift within the 15-40° on the a*b* Lab color map when viewed from all angles between 0-45° normal to an outer surface of the multilayer stack.
Dependencies are inferred from the claim text.