Squarylium Infrared Cut Filters Using Dye-Based NIR Absorption
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Solution Overview
Problem
Existing infrared/near infrared cut filters often contain foreign particles, such as glass pieces, which can lead to suboptimal performance in terms of near infrared ray absorption, necessitating the development of absorption dyes with improved near infrared ray absorption performance.
Innovation Solution
A squarylium compound with specific chemical formulations is introduced, offering high transmittance in the visible wavelength spectrum and selective absorption in the infrared/near infrared wavelength spectrum, integrated into infrared cut films and filters, and used in electronic devices for enhanced spectral sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal such as silver is deposited on a glass substrate to reflect near infrared rays, then near infrared ray reflection performance is improved, but foreign particles such as glass pieces may be mixed in, deteriorating manufacturing precision and reliability
Solution Approach 1:
The patent extracts the infrared cut function from the glass substrate itself and transfers it to a separate organic dye component. The squarylium compound dye is incorporated into a resin layer that is then applied to the glass substrate, separating the optical function from the structural substrate and eliminating foreign particle contamination during metal deposition processes
Solution Approach 2:
The patent changes the approach from physical metal deposition to chemical absorption by using squarylium compound dyes with specific molecular structures. The chemical formula parameters (R1-R6 substituents) are optimized to achieve maximum near infrared absorption while maintaining visible light transmission, transitioning from physical reflection to chemical absorption mechanisms
2Reliability
If a near infrared ray absorption dye is added to a transparent resin, then near infrared ray absorption performance is improved, but the complexity of achieving high selectivity between visible and infrared wavelengths increases
Solution Approach 1:
The patent applies local quality by designing the squarylium compound with specific functional groups at particular positions in the molecular structure. The R1-R6 substituents are strategically placed to create localized electron distribution patterns that resonate with near infrared wavelengths while leaving visible wavelength transmission unaffected, achieving spectral selectivity through molecular architecture
Solution Approach 2:
The patent creates a composite material system combining the squarylium compound dye with a transparent resin matrix. This composite achieves both the optical clarity of the resin and the near infrared absorption of the dye, with the resin providing mechanical support and the dye providing spectral selectivity, simplifying the overall filter design
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 squarylium compound achieves improved selective absorbance in the infrared/near infrared spectrum while maintaining high transmittance in the visible spectrum, enhancing the performance of infrared cut filters and electronic devices, particularly in low illumination environments.
Implementation Method 1
a squarylium compound having high transmittance in a visible wavelength spectrum of light and capable of selectively absorbing light in an infrared/near infrared wavelength spectrum of light
Data Source
AI summary
A squarylium compound has high transmittance in a visible wavelength spectrum of light and is configured to selectively absorb light in an infrared/near infrared wavelength spectrum of light.