  It is a formidable challenge to simultaneously achieve wide gamut, high
resolution, high-speed while low-cost manufacturability, long-term stability,
and viewing-angle independence in structural colors for practical applications.
The conventional nanofabrication techniques fail to match the requirement in
low-cost, large-scale and flexible manufacturing. Processing by ultrashort
lasers can achieve extremely high throughput while suffering from a narrow
gamut of 15% sRGB or angle-dependent colors. Here, we demonstrate an all-in-one
solution for ultrafast laser-produced structural colors on ultrathin hybrid
films that comprise an absorbent TiAlN layer coating on a metallic TiN layer.
Under pulsed laser irradiation, the absorption behaviors of the TiAlN-TiN
hybrid films are tailored by photothermal-induced oxidation on the topmost
TiAlN. The oxidized films exhibit double-resonance absorption, which is
attributed to the non-trivial phase shifts both at the oxide-TiAlN interface,
and at the TiAlN-TiN interface. By varying the accumulated laser fluence to
modulate the oxidation depth, an unprecedented large gamut of 90% sRGB is
obtained. Our highly reproducible printing technique manifests
angle-insensitive colors the variation of Hue is <0.14pi when viewing angles
changing from 6 to 60. The full-color printing speed reaches to 1.4 cm2/s and
the highest printing resolution exceeds 25000 dpi. The durability of the
laser-printed colors is confirmed by fastness examination, including salt fog,
double-85, light bleaching, and adhesion tests. These features render our
technique to be competitive for high-throughput industrial applications.
