Decoration member

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 (CuaNibOx), 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, Tx represents a function value depending on T1 of a function represented by the f(T1), n represents a positive integer of 1 or more, and σx is represented by Equation 3,
• wherein in Equation 2, T1 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 T0 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).