Block Copolymer Hole Transport for Light Emitting Devices
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Solution Overview
Problem
Existing polymer compounds used in light emitting devices do not exhibit sufficient hole transportability, which is essential for efficient device performance.
Innovation Solution
A block copolymer is developed with specific constitutional units and crosslinkable groups, including end groups and blocks that bind or do not bind to the end groups, to enhance hole transportability. The block copolymer is designed with non-crosslinkable and crosslinkable units in specific ratios and structures to improve charge transportability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer compounds containing fluorene and anthracene skeletons are used in light emitting devices, then the devices can form light emitting layers or charge transporting layers, but the hole transportability is insufficient
Solution Approach 1:
The polymer is divided into distinct blocks: a first block containing crosslinkable groups and hole transporting units, and a second block containing non-crosslinkable constitutional units. This segmentation allows the first block to provide hole transportability through crosslinking while the second block maintains processability, resolving the contradiction between improving hole transportability and managing structural complexity
Solution Approach 2:
Different blocks of the polymer are赋予 different functions: the first block is designed with crosslinkable groups and hole transporting units to provide excellent hole transportability, while the second block uses non-crosslinkable units to ensure processability. This local differentiation of properties allows each block to optimize its specific function without compromising the overall device performance
2Reliability
If crosslinkable groups are incorporated into polymer compounds to improve hole transportability, then charge transport properties are enhanced, but the polymer structure becomes more complex
Solution Approach 1:
The polymer is divided into distinct blocks: a first block containing crosslinkable groups and hole transporting units, and a second block containing non-crosslinkable constitutional units. This segmentation allows the first block to provide hole transportability through crosslinking while the second block maintains processability, resolving the contradiction between improving hole transportability and managing structural complexity
Solution Approach 2:
Different blocks of the polymer are赋予 different functions: the first block is designed with crosslinkable groups and hole transporting units to provide excellent hole transportability, while the second block uses non-crosslinkable units to ensure processability. This local differentiation of properties allows each block to optimize its specific function without compromising the overall device performance
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 block copolymer demonstrates improved hole transportability, leading to enhanced performance in light emitting devices by optimizing charge transport mechanisms.
Implementation Method 1
at least one selected from the group consisting of the above-described end group and the above-described block that binds to the end group contains a crosslinkable group
Data Source
AI summary
A block copolymer includes an end group, a block that binds to the end group, and a block that does not bind to the end group. The block that does not bind to the end group contains at least one non-crosslinkable constitutional unit represented by the formula (X) and/or at least one non-crosslinkable constitutional unit represented by the formula (Z). At least one of formulas (i) XI>XII, (ii) ZI>ZII and (iii) XI+ZI>XII+ZII is satisfied when the total number of non-crosslinkable constitutional units represented by formulas (X) and (Z) in the block that does not bind to the end group are represented by XI and ZI, respectively, and the total number of non-crosslinkable constitutional units represented by formulas (X) and (Z) in the block that binds to the end group are represented by XII and ZII, respectively.