Charge-Transport Polymer for Wet-Process Organic EL
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Solution Overview
Problem
Conventional polymer materials used in organic electroluminescent (EL) elements produced by wet processes face challenges in solubility in solvents and curability, limiting their effectiveness in large-screen organic EL displays.
Innovation Solution
A charge transport polymer is developed, featuring terminal groups with a polymerizable functional group and an aromatic hydrocarbon group substituted with an electron-withdrawing substituent, enhancing solubility and curability in wet processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polymer materials are used in wet processes, then film formation is simplified and cost is reduced, but solubility in solvents and curability are insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of the polymer by introducing specific terminal groups (formula P1 with polymerizable functional groups) and controlling the proportion of structural units (3-60 mol %), thereby changing the solubility and curability parameters while maintaining wet process compatibility
Solution Approach 2:
The patent creates a composite polymer structure combining specific terminal groups (P1 with polymerizable groups) with the main polymer chain, forming a hybrid material that integrates both the simplicity of conventional polymers and the enhanced properties of specially designed molecular structures
2Ease of manufacture
If polymer materials with improved solubility are used, then wet process characteristics are enhanced, but curability may be compromised
Solution Approach 1:
The patent precisely controls the proportion of structural units containing terminal groups P1 (3-60 mol %) to optimize the balance between solubility and curability, using parameter optimization to achieve both improved wet process characteristics and adequate curability
Solution Approach 2:
The patent introduces polymerizable functional groups specifically at the terminal positions of the polymer chains (terminal groups P1), concentrating the curability-enhancing functionality at specific locations while maintaining overall solubility through the designed molecular architecture
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 charge transport polymer improves the solvent resistance and curability of organic layers, enabling the formation of high-quality organic electronic elements, organic EL elements, and display devices suitable for large-screen applications.
Implementation Method 1
the terminal groups include a terminal group P containing a polymerizable functional group
Data Source
AI summary
One embodiment relates to a charge transport polymer containing a molecular chain and terminal groups bonded to the molecular chain, wherein the terminal groups include a terminal group P containing a polymerizable functional group and a terminal group EW containing an aromatic hydrocarbon group substituted with an electron-withdrawing substituent, the terminal group P includes a terminal group represented by formula (P1) shown below, and among the carbon atoms contained in the ring of the aromatic hydrocarbon group, if the carbon atom that is bonded to the molecular chain is numbered 1, and numbers are assigned in order to the adjoining carbon atoms, then the electron-withdrawing substituent is bonded to a carbon atom numbered 1+2n (wherein n is an integer of 1 or greater).