Light-Absorbing Films with Copper-Ion Phosphonic Acid for UV-IR Cutoffs
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Solution Overview
Problem
Existing optical filters using phenyl-based or alkyl-based phosphonic acids for UV-IR absorption have limitations in achieving desired optical properties, particularly in UV cut-off wavelength and IR cut-off wavelength, and do not effectively approximate human visual sensitivity.
Innovation Solution
A light-absorbing composition comprising a phosphonic acid represented by formula (A) and copper ion, combined with a curable resin, to form a light-absorbing film that achieves desired optical properties without relying on phenyl-based or alkyl-based phosphonic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phenyl-based phosphonic acid and alkyl-based phosphonic acid are used for UV-IR absorption, then optical filter can block UV and IR light, but the UV cut-off wavelength is less than 400 nm and IR cut-off wavelength is not sufficiently extended, failing to approximate human visual sensitivity
Solution Approach 1:
The patent changes the chemical structure parameters of the phosphonic acid by introducing a specific aromatic ring structure with electron-withdrawing groups (nitro or cyano groups) at specific positions. This structural parameter change enables the light absorber to achieve UV cut-off wavelength of 400 nm or more and IR cut-off wavelength of 700 nm or more, thereby approximating human visual sensitivity while maintaining reliable optical filtering performance
Solution Approach 2:
The patent creates a composite light-absorbing material by combining the specifically structured phosphonic acid with copper ion. This composite material achieves superior UV-IR absorption characteristics that neither component alone could provide, resolving the contradiction between reliable optical properties and precise cut-off wavelength control
2Ease of operation
If light-absorbing film is used instead of dielectric multilayer film, then transmittance properties become less dependent on incident angle and ghosting/flare are reduced, but achieving desired UV-IR cut-off wavelengths becomes more difficult
Solution Approach 1:
The patent modifies the molecular structure parameters of the phosphonic acid by introducing electron-withdrawing groups (nitro or cyano groups) at specific positions on the aromatic ring. This parameter change enables the light-absorbing film to achieve both angle-independent transmittance properties and precise UV-IR cut-off wavelengths, resolving the contradiction between ease of operation and manufacturing precision
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 composition provides a light-absorbing film with improved UV and IR cut-off wavelengths, enhancing spectral transmittance in the visible range and effectively blocking ultraviolet and infrared light, aligning with human visual sensitivity.
Implementation Method 1
a light absorber made of a phosphonic acid represented by formula (A) and copper ion
Data Source
AI summary
The light-absorbing composition according to the present invention includes: a light absorber made of a phosphonic acid represented by the following formula (A) and copper ion; and a curable resin. A light-absorbing film having desired properties can be provided by curing a coating film of the light-absorbing composition. In the formula (A), R1 to R5 are each independently a hydrogen atom, a halogen atom, a hydroxy group, or a nitro group, and n represents an integer of 1 to 3.