Omnidirectional high chromatic red structural colorant with a combination of a semiconductor absorber layer and a dielectric absorber layer

Abstract

The present invention relates to omnidirectional high chromatic red structural colorants having a combination of a semiconductor absorber layer and a dielectric absorber layer. An omnidirectional high chromatic red structural color pigment. Omnidirectional structural color pigments are in the form of a multilayer stack having 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 refractive index dielectric layer extending across the dielectric absorber layer. The multilayer stack reflects single-band visible light having a hue between 0-40°, and preferably between 10-30° on the a*b*Lab color map. The single-band visible light has a hue shift of less than 30° on the a*b*Lab colormap when viewed from all angles between 0-45° normal to the outer surface of the multilayer stack.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part (CIP) of U.S. Patent Application Serial No. 14 / 607,933, filed January 28, 2015, which in turn is Serial No. 14 / 607,933, filed August 28, 2014 CIP to U.S. Patent Application Serial No. 14 / 471,834, U.S. Patent Application Serial No. 14 / 471,834 and CIP to U.S. Patent Application Serial No. 14 / 460,511 filed August 15, 2014, Serial No. 14 / 460,511 U.S. Patent Application Serial No. 14 / 242,429 filed April 1, 2014, and U.S. Patent Application Serial No. 14 / 242,429 filed December 23, 2013 with Serial No. CIP of U.S. Patent Application Serial No. 14 / 138,499, which is in turn CIP of U.S. Patent Application Serial No. 13 / 913,402 filed June 8, 2013, Serial No. 13 / 913,402 U.S. Patent Application Serial No. 13 / 760,699, filed February 6, 2013, and U.S. Patent Application Serial No. 13 / 760,699, filed August 10, 2012, Serial No. 13 CIP of US Patent Application / 572,071, all of which are incorpora...

AI Technical Summary

Problems solved by technology

[0007] In addition to the above, it should also be understood that the design of pigments having a red color faces additional difficulties relative to pigments of other colors (such as blue, green, etc.)

In particular, the control of the angular independence of the red color is difficult because thicker dielectric layers are required, which in turn leads to high harmonic designs, i.e. the presence of second and possibly third harmonics is unavoidable

Also, the dark red color has a very narrow tonal space

Images