Decoration member
The present disclosure relates to a decoration member comprising: a color expression layer comprising a light reflection layer and a light absorption layer provided on the light reflection layer; and a substrate provided on one surface of the color expression layer, in which the light absorption layer comprises a copper nickel oxide (Cu a Ni b O x ).
1. A decoration member comprising:
a color expression layer comprising a light reflection layer and a light absorption layer provided on the light reflection layer; and
a substrate provided on one surface of the color expression layer,
wherein the light absorption layer comprises a copper nickel oxide (Cu a Ni b O x ), and
ω represented by Equation 1 is in a range of 0.71 to 3, when a component analysis is performed with respect to any one point of the light absorption layer:
ω
=
(
T
x
)
×
(
σ
x
)
[
Equation
1
]
f
(
T
1
)
=
T
1
T
0
(
0
<
T
1
≤
T
0
)
[
Equation
2
]
f
(
T
1
)
=
f
(
T
1
+
n
×
T
0
)
σ
x
=
a
+
b
x
×
1.2
[
Equation
3
]
wherein in Equation 1, T x represents a function value depending on T 1 of a function represented by the f(T 1 ), n represents a positive integer of 1 or more, and σ x is represented by Equation 3,
wherein in Equation 2, T 1 represents a thickness of the light absorption layer comprising any one point of the light absorption layer in which the component analysis is performed and T 0 is 60 nm, and
wherein in Equation 3, the a means an element content ratio of copper (Cu), b means an element content ratio of nickel (Ni), and x means an element content ratio of oxygen (O).
2. The decoration member of claim 1 , wherein T x is in a range of 0.51 to 1.
3. The decoration member of claim 1 , wherein σ x is in a range of 0.1 to 5.
4. The decoration member of claim 1 , wherein a Hue-angle h* in CIE LCh color space of the light absorption layer is in a range of 105 to 315°.
5. The decoration member of claim 1 , wherein the light reflection layer is constituted by a single layer or multiple layers comprising one or more types of materials selected from the group consisting of indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nb), iron (Fe), chromium (Cr), cobalt (Co), gold (Au), and silver (Ag); an oxide, nitride, or an oxynitride thereof; carbon and a carbon composite.
6. The decoration member of claim 1 , wherein the light absorption layer has a refractive index of 0 to 8 at a wavelength of 400 nm.
7. The decoration member of claim 1 , wherein the light absorption layer has an extinction coefficient of greater than 0 and less than or equal to 4 at a wavelength of 400 nm.
8. The decoration member of claim 1 , wherein the light absorption layer comprises two or more points having different thicknesses.
9. The decoration member of claim 1 , wherein the color expression layer further comprises a color film.
10. The decoration member of claim 1 , wherein the color expression layer or the substrate comprises a pattern layer.
11. The decoration member of claim 10 , wherein the pattern layer comprises a convex or concave shape having a cross section having an asymmetric structure.
12. The decoration member of claim 1 , wherein the decoration member has dichroism of ΔE*ab>1.
13. The decoration member of claim 1 , wherein the substrate comprises a plastic injection molding or a glass substrate for a cosmetic case.
14. The decoration member of claim 13 , wherein the plastic injection molding comprises at least one of polypropylene (PP), polystyrene (PS), polyvinylacetate (PVAc), polyacrylate, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), ethylene-vinyl acetate copolymer (EVA), polycarbonate (PC), polyamide, and styrene-acrylonitrile copolymer (SAN).