Red Structural Color via Semiconductor Absorption
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Solution Overview
Problem
High-chroma omnidirectional structural colors using multilayer stacks require a large number of thin film layers, leading to prohibitively high production costs.
Innovation Solution
A multilayer stack providing red omnidirectional structural color with a semiconductor and dielectric layer configuration that absorbs and reflects specific wavelengths, reducing the number of layers needed while maintaining color properties, comprising a core layer, semiconductor layer, and dielectric layer that form an omnidirectional reflector with a narrow band reflection peak and minimal color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large number of thin film layers are used to achieve high-chroma omnidirectional structural color, then the color properties are improved, but the production cost increases prohibitively
Solution Approach 1:
The patent changes the material parameters by introducing a semiconductor layer with specific optical absorption properties (absorbing wavelengths less than 550 nm) combined with a dielectric layer. This material parameter change allows achieving the same color effect with fewer layers, directly resolving the contradiction between color quality and layer complexity
Solution Approach 2:
The patent uses a composite structure combining semiconductor and dielectric materials with different optical properties. The semiconductor layer absorbs specific wavelengths while the dielectric layer reflects others, creating a synergistic effect that achieves high-chroma color with reduced layer count, thus resolving the technical contradiction
2Manufacturing precision
If a large number of thin film layers are used to achieve high-chroma omnidirectional structural color, then the color properties are improved, but the production cost becomes prohibitive
Solution Approach 1:
By changing the material parameters to include a semiconductor layer with specific bandgap properties that absorb wavelengths less than 550 nm, the patent reduces the total number of layers required. This parameter change directly lowers production complexity and cost while maintaining color quality
Solution Approach 2:
The patent applies local quality by assigning specific functional properties to different layers: the semiconductor layer handles absorption of shorter wavelengths while the dielectric layer handles reflection of longer wavelengths. This functional differentiation allows each layer to work optimally, reducing the total number of layers needed and thereby reducing production cost
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a high-chroma red color with a reduced number of layers, resulting in lower production costs and maintaining angular independence and color consistency across viewing angles.
Implementation Method 1
The semiconductor layer absorbs more than 70% of incident white light that has a wavelength less than 550 nanometers (nm)
Implementation Method 2
the dielectric layer in combination with the core layer reflects more than 70% of incident white light with a wavelength generally greater than 550 nm
Data Source
AI summary
A multilayer stack displaying a red omnidirectional structural color. The multilayer stack includes a core layer, a semiconductor layer extending across the core layer, and a dielectric layer extending across the semiconductor layer. The semiconductor layer absorbs more than 70% of incident white light that has a wavelength less than 550 nanometers (nm). In addition, the dielectric layer in combination with the core layer reflects more than 70% of the incident white light with a wavelength greater than 550 nm. In combination, the core layer, semiconductor layer and dielectric layer form an omnidirectional reflector that reflects a narrow band of electromagnetic radiation with a center wavelength between 550-700 nm, has a width of less than 200 nm wide and a color shift of less than 100 nm when the reflector is viewed from angles between 0 and 45 degrees.