UV-IR Absorbing Filter Composition for Imaging Sensors
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Solution Overview
Problem
Existing near-infrared cut filters for solid-state imaging sensors require complex production processes involving dielectric multilayer films and lack adequate moisture resistance, leading to suboptimal spectral sensitivity and optical properties that deviate from human visual sensitivity.
Innovation Solution
A UV- and IR-absorbing composition comprising a phosphonic acid, copper ion, phosphoric acid ester, and alkoxysilane monomer, applied as a film on a transparent dielectric substrate, forming an absorbing layer with improved moisture resistance and spectral sensitivity alignment with human visual sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric multilayer film is used to achieve near-infrared reflection, then the optical filter can block near-infrared light, but the production process becomes complicated and requires vacuum deposition apparatus
Solution Approach 1:
The patent extracts the near-infrared blocking function from the complex dielectric multilayer film structure and implements it through a simple organic compound layer containing copper coordination compounds. This eliminates the need for vacuum deposition apparatus and complex multi-layer structures while maintaining the near-infrared blocking performance.
Solution Approach 2:
The patent replaces expensive and complex dielectric multilayer films with a simple, inexpensive organic compound layer that can be applied through conventional coating methods. This approach uses readily available materials and simple processing steps, making the production process accessible without specialized equipment.
2Device complexity
If a simple organic compound layer is used without dielectric multilayer film, then production becomes simpler, but the transmission region becomes too wide allowing unwanted near-infrared and ultraviolet light transmission
Solution Approach 1:
The patent applies local quality by designing the organic compound layer with copper coordination compounds that specifically target and absorb near-infrared wavelengths. The molecular structure of these compounds is tailored to have electronic transitions that correspond to near-infrared energy levels, providing selective blocking at this specific wavelength range while maintaining simplicity in the overall structure.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the molecular structure of the organic compounds to control the absorption characteristics. By modifying the ligand types and copper coordination geometries, the absorption spectrum can be fine-tuned to block near-infrared light effectively while maintaining a simple single-layer structure without dielectric multilayers.
3Reliability
If conventional near-infrared cut filters are used, then near-infrared blocking is achieved, but moisture resistance is insufficient leading to optical property degradation
Solution Approach 1:
The patent creates a composite material system by combining organic compounds with copper ions to form coordination compounds. This composite structure provides both the near-infrared blocking function through the copper coordination complex and improved moisture resistance through the stable coordination bonds between copper and the organic ligands, creating a more robust filter layer.
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 provides a simple, effective method to produce UV- and IR-absorbing filters with enhanced moisture resistance and spectral sensitivity matching human visual sensitivity, reducing production complexity and optical deviations.
Implementation Method 1
an absorber formed by a phosphonic acid represented by formula (a) and copper ion... wherein the absorber absorbs ultraviolet light and infrared light
Implementation Method 2
an alkoxysilane monomer... having a siloxane bond formed by a hydrolysis reaction and a condensation reaction
Implementation Method 3
a siloxane bond formed by a hydrolysis reaction and a condensation reaction
Data Source
AI summary
A UV-IR-absorbing composition according to the present invention includes: an absorber formed by a phosphonic acid represented by the following formula (a) and copper ion, the absorber being dispersed in the UV-IR-absorbing composition; a phosphoric acid ester allowing the absorber to be dispersed; a matrix resin; and an alkoxysilane monomer.