Squarylium Metallocene Resin Optical Filter Fluorescence Suppression
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Solution Overview
Problem
Existing optical filters for liquid crystal display devices using squarylium colorants suffer from fluorescence depolarization and decreased light absorption capacity over time, particularly when exposed to light, which affects image quality and contrast.
Innovation Solution
A resin composition incorporating a squarylium colorant linked with a metallocene compound and featuring an intramolecular hydrogen-bonding group is used to form an optical filter, which effectively suppresses fluorescence emission and oxidative decomposition, enhancing light resistance and absorption capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If squarylium colorant is used in optical filter, then light absorption at specific wavelength is improved, but fluorescence emission causes depolarization and reduces polarization performance
Solution Approach 1:
The patent converts the harmful fluorescence emission into a beneficial effect by using the excited squarylium colorant to generate singlet oxygen, which then selectively oxidizes and removes unsaturated impurities from the liquid crystal composition. The fluorescence energy that would normally depolarize light is instead channeled into a useful photochemical reaction that improves liquid crystal purity and performance
Solution Approach 2:
The patent introduces singlet oxygen as an intermediary substance between the squarylium colorant and the liquid crystal impurities. The squarylium colorant generates singlet oxygen through photoexcitation, and the singlet oxygen acts as the active species that oxidizes and removes unsaturated impurities from the liquid crystal composition
2Illumination intensity
If squarylium colorant is used in optical filter, then light absorption at specific wavelength is improved, but light absorption capacity decreases over time due to oxidative decomposition
Solution Approach 1:
The patent converts the potentially harmful oxidative decomposition into a beneficial process by directing the generated singlet oxygen to oxidize and remove unsaturated impurities from the liquid crystal composition. This selective oxidation protects the squarylium colorant from degradation while improving the overall stability of the liquid crystal system
Solution Approach 2:
The patent applies preliminary anti-action by using the squarylium colorant to generate singlet oxygen that proactively oxidizes and removes unsaturated impurities before these impurities can cause degradation or instability in the liquid crystal composition, thereby preventing future problems
Data Source
AI summary
Provided are a resin composition including a compound represented by Formula (1) and a resin, an optical filter including the resin composition, a liquid crystal display device and a solid-state imaging element including the optical filter, and a compound suitable as a light absorbing component of the resin composition.In Formula (1), Dye represents a colorant structural part obtained by removing n1 hydrogen atoms from a squarylium compound having a specific structure, Q1 is a structural part including a metallocene structure, and n1 represents an integer of 1 to 6.