Hole Transport Copolymer for Solvent-Resistant Electroluminescent Coatings
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Solution Overview
Problem
Existing hole transport materials used in electroluminescent devices do not have sufficient solvent resistance when formed by coating methods, leading to issues with manufacturing efficiency and device longevity.
Innovation Solution
A copolymer with specific structural units, represented by Chemical Formulas 1 and 2, which provides excellent solvent resistance and can be used to form a hole transport layer, enhancing the luminous efficiency and lifespan of electroluminescent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coating method is used to form the hole transport layer, then manufacturing efficiency and cost are improved, but the existing hole transport material does not have sufficient solvent resistance leading to film integrity issues
Solution Approach 1:
The patent modifies the chemical structure of the hole transport material by introducing specific structural units (Formula 1 and Formula 2) that change the material's solvent resistance parameters. This allows the material to maintain film integrity during coating processes while achieving both manufacturing efficiency and reliability.
Solution Approach 2:
The patent creates a composite polymer structure combining multiple structural units (Formula 1 with aromatic rings and Formula 2 with heteroaromatic rings) to achieve both good solvent resistance and processability. This composite approach resolves the contradiction between coating method benefits and solvent resistance requirements.
2Ease of manufacture
If the lower layer is formed by coating method, then manufacturing cost and efficiency are reduced, but the material must have low solubility in the solvent used for forming the upper layer
Solution Approach 1:
The patent adjusts the solubility parameter of the hole transport material through specific structural modifications. The polymer is designed to have appropriate solubility in the coating solvent for easy manufacturing while maintaining low solubility in the upper layer solvent to prevent mixing, thus resolving the contradiction between ease of manufacture and composition stability.
3Use of energy by moving object
If quantum dots are used for light emission, then color purity and luminous efficiency are improved, but the device requires precise control of emission wavelength and has complex structure requirements
Solution Approach 1:
The patent uses structural modifications in the hole transport material to optimize device performance parameters. By adjusting the polymer structure (Formula 1 and Formula 2 units), the material can support quantum dot-based emission with high luminous efficiency while simplifying the overall device structure through improved material properties.
Data Source
AI summary
A copolymer including a structural unit represented by Chemical Formula 1, and a structural unit represented by Chemical Formula 2:wherein in Chemical Formula 1 and Chemical Formula 2, R1, R2, R3, R4, R5, R6, R7, R8, L1, A1, A4, *, and *2 are the same as defined herein.