Room-Temperature Decolorization in Light Absorption Filters
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Solution Overview
Problem
Existing light absorption filters require heating during ultraviolet irradiation to achieve effective decolorization, which complicates the manufacturing process and reduces productivity.
Innovation Solution
A light absorption filter configuration that includes a resin, a dye with a main absorption wavelength band in the 400 to 700 nm range, and a compound that generates a radical upon ultraviolet irradiation, where the dye comprises an azo-based or indoaniline-based coloring agent. This configuration allows for excellent decolorization at room temperature without secondary absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heating is applied during ultraviolet irradiation to achieve effective decolorization, then the decolorization rate is improved, but the manufacturing process complexity increases and productivity decreases
Solution Approach 1:
The patent changes the chemical parameters of the dye molecule by introducing specific substituents (electron-withdrawing groups like -NO2, -CN, -CF3, and electron-donating groups like -NH2, -OH) at defined positions relative to the azo group. This molecular parameter modification enables the dye to undergo efficient decolorization through radical attack at room temperature, eliminating the need for heating and thus resolving the contradiction between decolorization effectiveness and manufacturing efficiency
2Manufacturing precision
If heating is applied during ultraviolet irradiation to achieve effective decolorization, then the decolorization rate is improved, but the device complexity increases
Solution Approach 1:
The modified dye molecules possess intrinsic properties that enable them to undergo efficient decolorization reactions with radicals generated during ultraviolet irradiation at room temperature. The dye structure itself (with specific substituent patterns) provides the necessary reactivity, making the system self-sufficient without requiring external heating devices or complex temperature control mechanisms, thereby reducing device complexity
3Illumination intensity
If conventional dyes are used in light absorption filters, then the light absorption effect is achieved, but secondary absorption occurs after ultraviolet irradiation
Solution Approach 1:
The patent applies local quality by specifically positioning electron-withdrawing groups at ortho or para positions relative to the azo group, and electron-donating groups at meta positions. This localized substitution pattern creates specific electronic distribution and steric effects that prevent the formation of secondary absorption structures during and after ultraviolet irradiation, while maintaining the dye's light absorption capability in the visible range
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 proposed light absorption filter exhibits an excellent decolorization rate at room temperature, reducing the need for heating and improving manufacturing efficiency while minimizing secondary absorption.
Implementation Method 1
a compound that generates a radical upon ultraviolet irradiation
Data Source
AI summary
A light absorption filter that contains a resin; a dye having a main absorption wavelength band in a wavelength range of 400 to 700 nm, including at least one of a specific azo-based coloring agent represented by any of General Formulae (i) to (iv) or a specific indoaniline-based coloring agent represented by General Formula (v); and a compound that generates a radical upon ultraviolet irradiation. There is also an optical filter that uses the light absorption filter and a manufacturing method for the optical filter, as well as an organic electroluminescent display device, an inorganic electroluminescent display device, or a liquid crystal display device, which includes the optical filter.