Rylene Dichroic Dye Liquid-Crystalline Medium for Red Light Control
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Solution Overview
Problem
Existing liquid-crystalline media in guest-host type devices lack the ability to effectively control radiation energy in the red and near-infrared light regions, leading to inefficient energy regulation and stability issues under sunlight, UV light, and electric fields.
Innovation Solution
A liquid-crystalline medium incorporating a dichroic dye with a rylene structure that absorbs red or longer-wave light, providing enhanced solubility, stability, and control over radiation energy transmission in the 580-2000 nm range, utilizing specific compounds with absorption maxima and degree of anisotropy for efficient alignment and fluorescence properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid-crystalline media use conventional dichroic dyes (anthraquinones, naphthoquinones, azo dyes), then the device can control visible light transmission, but the intensity of fluorescence and solubility in liquid-crystalline media are insufficient
Solution Approach 1:
The patent changes the chemical structure parameter of the dichroic dye from conventional anthraquinone, naphthoquinone, or azo dyes to rylene dyes with specific substitution patterns. The rylene structure with n=1-10 and specific radical substitutions (formula I) provides enhanced solubility in liquid-crystalline media while maintaining the ability to absorb red and near-infrared light, thus resolving the contradiction between solubility and radiation control capability.
Solution Approach 2:
The patent creates a composite system by combining rylene dichroic dyes with specific liquid-crystalline host materials. The rylene dye molecules are dissolved in the liquid-crystalline medium at optimized concentrations (0.01-10 wt%), forming a composite material that achieves both high solubility and effective radiation energy control in the red and NIR regions.
2Reliability
If liquid-crystalline media use conventional dichroic dyes, then the device structure is simpler, but the stability to light, extreme temperatures and electric fields is insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the dichroic dye by using rylene cores with n=1-10 and specific radical substitutions (formula I). This structural parameter change enhances the dye's stability to sunlight, UV light, and electric fields. The rylene structure with appropriate substitution patterns provides better resistance to degradation under extreme conditions compared to conventional dyes, while maintaining manageable device complexity.
3Use of energy by moving object
If liquid-crystalline media use dyes that absorb red light, then the device can regulate more radiation energy, but the fluorescence intensity and solubility are insufficient
Solution Approach 1:
The patent optimizes the absorption spectrum parameter by selecting rylene dyes with absorption maxima in the red and near-infrared regions (wavelengths >600 nm). The specific rylene structure with n=1-10 and formula I substitutions achieves strong absorption in these regions while simultaneously providing enhanced fluorescence intensity and solubility in liquid-crystalline media, resolving the contradiction between energy control range and performance quality.
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 medium achieves stable and efficient control of radiation energy in the red and near-infrared regions, maintaining solubility and stability over time, even at extreme temperatures and under UV light and electric fields, enabling improved performance in energy regulation devices.
Implementation Method 1
a liquid-crystalline medium comprising at least one dichroic dye having a rylene structure which absorbs red or longer-wave light
Implementation Method 2
The liquid-crystalline medium according to the invention comprises one or more compounds of the formula (I)... the dichroic dye is preferably dissolved in the liquid-crystalline medium and is furthermore preferably influenced in its alignment by the alignment of the compounds of the liquid-crystalline medium
Implementation Method 3
utilizing specific compounds with absorption maxima and degree of anisotropy for efficient alignment and fluorescence properties
Data Source
AI summary
The application relates to a liquid-crystalline medium comprising at least one dichroic dye having a rylene structure which absorbs red light. The application furthermore relates to a device, preferably a device for the regulation of the passage of energy through a light-transmitting area, which contains the liquid-crystalline medium.