Dichroic Substance HOMO Level for Light Fastness
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Solution Overview
Problem
Existing light absorption anisotropic films using dichroic substances with azo groups often exhibit insufficient light fastness due to oxidative decomposition, and existing technologies fail to provide a solution for improving this property effectively.
Innovation Solution
A composition containing a dichroic substance with an azo group, exhibiting a highest occupied molecular orbital energy level of −5.60 eV or less and a CLogP value of 7.0 or greater, is used to form a light absorption anisotropic film, which enhances light fastness by employing specific molecular structures and additives like liquid crystalline compounds and photopolymerization initiators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a dichroic substance with an azo group is used in a light absorption anisotropic film, then the film can be formed with good alignment degree, but the light fastness is insufficient due to oxidative decomposition
Solution Approach 1:
The patent changes the energy level parameter of the dichroic substance by selecting compounds with HOMO energy levels of −5.60 eV or less. This parameter change fundamentally alters the oxidative stability of the azo group, enabling the substance to resist oxidation during light exposure while maintaining its alignment properties in the light absorption anisotropic film.
2Ease of manufacture
If conventional dichroic substances are used, then the manufacturing process is simple, but the decomposition rate under light exposure is high
Solution Approach 1:
The patent applies parameter changes by selecting dichroic substances with specific HOMO energy levels (−5.60 eV or less), which inherently possess high resistance to oxidative decomposition. This allows the manufacturing process to remain simple while dramatically reducing the decomposition rate under light exposure, as the selected substances naturally resist oxidation without requiring complex additional processing steps.
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 resulting light absorption anisotropic film demonstrates improved light fastness, with a significant reduction in decomposition rates when exposed to light, as shown by the use of dichroic substances with HOMO energy levels of −5.60 eV or less, leading to enhanced durability and performance.
Implementation Method 1
a dichroic substance having an azo group, in which the dichroic substance exhibits a highest occupied molecular orbital energy level of −5.60 eV or less
Data Source
AI summary
An object of the invention is to provide a dichroic substance capable of forming a light absorption anisotropic film having excellent light fastness, a composition, a light absorption anisotropic film formed of the composition, a laminate, and an image display device. A composition according to the embodiment of the invention is a composition containing a dichroic substance having an azo group, and the dichroic substance exhibits a highest occupied molecular orbital energy level of −5.60 eV or less and a CLogP value of 7.0 or greater.