Core-Shell Dye for CMOS Near-Infrared Films
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Solution Overview
Problem
Existing near-infrared absorbing films for CMOS image sensors face challenges with high viscosity and inferior durability due to the use of inorganic dyes, which require excessive amounts and have limitations in chemical and light resistance.
Innovation Solution
A core-shell dye with a specific chemical structure, comprising a core represented by Chemical Formula 1 and a shell represented by Chemical Formula 2, is developed, offering high near-infrared absorption intensity and improved durability through a macrocyclic shell structure that enhances chemical and light resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic dyes are used to form the near-infrared absorbing film, then near-infrared absorption intensity is improved, but viscosity increases and processability deteriorates
Solution Approach 1:
The inorganic dye particles are segmented into fine particles with specific size ranges (0.1-10 μm), which reduces viscosity and improves processability while maintaining absorption intensity. The segmentation allows the dye to be more effectively dispersed in the coating composition.
Solution Approach 2:
The patent changes physical parameters of the inorganic dye, specifically controlling particle size and surface properties, to achieve optimal balance between absorption intensity and processability. The particle size parameter is optimized to prevent excessive viscosity while maintaining effective near-infrared absorption.
2Reliability
If inorganic dyes are used to form the near-infrared absorbing film, then near-infrared absorption intensity is improved, but film thickness increases
Solution Approach 1:
The patent uses organic dyes as a substitute (copy) for inorganic dyes, achieving similar near-infrared absorption functionality with better processability and thinner film formation. The organic dye molecules replicate the absorption function without the drawbacks of inorganic particle-based systems.
Solution Approach 2:
The patent optimizes the concentration parameter of the dye in the coating composition and controls drying parameters to achieve the desired absorption intensity with minimal film thickness. By precisely controlling these parameters, the film is as thin as 1 μm or less while maintaining effective near-infrared absorption.
3Ease of manufacture
If organic dyes are used to replace inorganic dyes, then processability is improved, but durability (chemical resistance, light resistance) deteriorates
Solution Approach 1:
The patent creates a composite coating system combining organic dye molecules with a polymer binder matrix. This composite structure provides the processability benefits of organic dyes while the polymer matrix enhances durability, chemical resistance, and light fastness. The binder resin protects the organic dye molecules from degradation.
Solution Approach 2:
The polymer binder acts as an intermediary between the organic dye and the environment, protecting the dye from chemical and light damage while allowing the dye to maintain its absorption function. The binder resin molecules surround and protect the dye molecules, improving overall durability without compromising processability.
4Reliability
If excessive amount of inorganic dyes is used, then near-infrared absorption intensity is improved, but viscosity increases
Solution Approach 1:
The patent uses organic dyes that can be applied at lower concentrations compared to inorganic dyes. The organic dye molecules are more efficient per unit mass, allowing reduced dye content in the coating composition while achieving the same or better absorption intensity. This reduces the quantity of substance needed.
Solution Approach 2:
The patent optimizes the dye concentration parameter in the coating composition, achieving effective near-infrared absorption with minimal dye content. By controlling the concentration parameter precisely and optimizing other formulation parameters, the patent reduces the total quantity of dye required while maintaining absorption intensity.
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 core-shell dye provides excellent matching properties with near-infrared absorption wavelengths, reduces dye content, and improves processability, resulting in a durable and efficient near-infrared absorbing film for CMOS image sensors.
Implementation Method 1
the core-shell dye exhibits high near-infrared absorption intensity and ensuring durability... The core-shell dye may have a maximum absorption peak at a wavelength of 700 nm to 1,000 nm
Data Source
AI summary
This disclosure relates to a core-shell dye, a near-infrared absorbing resin composition including the same, and a near-infrared absorbing film. Specifically, an embodiment provides a core-shell dye consisting of a core represented by Chemical Formula 1; and a shell surrounding the core and represented by Chemical Formula 2:(In Chemical Formulas 1 and 2, each substituent is as defined in the specification.)