Xanthene Compound Light Shielding Long-Wavelength Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional xanthene compounds have insufficient light shielding properties, particularly in the long-wavelength region of visible light due to their maximum absorption wavelength around 550 nm.
Innovation Solution
A xanthene compound represented by Formula (1) with specific structural modifications, including aryl groups with electron donating substituents, is used in a resin composition along with an alkali-soluble resin and a photosensitive compound, which enhances the light shielding properties by extending the maximum absorption wavelength to the long-wavelength region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional xanthene compound is used as a colorant in the resin composition, then the resin composition achieves high heat resistance, but the light shielding property particularly in the long-wavelength region of visible light is insufficient
Solution Approach 1:
The patent modifies the molecular structure of the xanthene compound by introducing specific substituents (electron-donating groups at positions 2 and 7, and electron-withdrawing groups at positions 4 and 5) to change the absorption characteristics. This structural parameter change extends the maximum absorption wavelength from around 550 nm to 600 nm or more, thereby improving light shielding in the long-wavelength region while preserving the heat resistance inherent to the xanthene core structure
Solution Approach 2:
The patent creates a composite colorant system by combining the modified xanthene compound with specific resins (polyimide, polyamide-imide, or polyester). This composite approach allows the xanthene compound's enhanced absorption properties to work synergistically with the resin matrix, achieving both high heat resistance from the resin and improved light shielding from the modified colorant
2Device complexity
If the maximum absorption wavelength of the xanthene compound is around 550 nm, then the compound maintains simplicity in structure, but the light shielding property in the long-wavelength region is insufficient
Solution Approach 1:
The patent systematically modifies the xanthene structure by adding specific substituent groups at defined positions (electron-donating groups at positions 2 and 7, electron-withdrawing groups at positions 4 and 5). These controlled structural parameter changes extend the absorption spectrum to 600 nm or more while maintaining reasonable structural complexity through the use of common aromatic substituents rather than overly complex molecular architectures
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 modified xanthene compound effectively shields light up to the long-wavelength region of visible light, improving the light shielding properties of the resin composition and enhancing the performance of organic electroluminescence (EL) display devices.
Implementation Method 1
A xanthene compound (b) having a maximum absorption wavelength at 600 nm or more and less than 800 nm at 350 to 800 nm
Data Source
AI summary
An object of the present invention is to provide a xanthene compound having high heat resistance and capable of shielding light up to a long-wavelength region of visible light as compared to a conventional xanthene compound. In order to solve the above problem, a xanthene compound (b) of the present invention is a xanthene compound (b) represented by Formula (1).