Partially Fluorinated Polymer Side Chains for OLED Electron Injection
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Solution Overview
Problem
There is a need for novel materials with low LUMO levels for improved electron injection and reduced operating voltage in organic electronic devices, as well as materials with enhanced solubility and wetting properties to facilitate multilayered structures, particularly in blue-emitting systems for high-quality applications.
Innovation Solution
Polymers comprising structural units with partially fluorinated side chains, which lower the LUMO orbital and modify solubility properties, enabling easier electron injection and the construction of multilayered systems in organic electroluminescent devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional polymeric materials are used in organic electroluminescent devices, then the device structure is simple, but the LUMO level is high resulting in poor electron injection and high operating voltage
Solution Approach 1:
The patent applies local quality by introducing partially fluorinated side chains at specific positions on the polymer structure. This localized modification of the side chains (rather than the entire polymer backbone) selectively lowers the LUMO level to improve electron injection, while maintaining the overall polymer architecture and processing advantages. The fluorinated groups are strategically placed to optimize electronic properties without compromising structural simplicity.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition of side chains through partial fluorination. This changes the electronic parameters (LUMO level) of the polymer material, enabling better electron injection and reduced operating voltage. The degree of fluorination can be tuned to achieve optimal balance between electronic performance and material stability.
2Adaptability or versatility
If conventional polymeric materials are used, then processing is straightforward, but solubility and wetting properties are insufficient for constructing multilayered systems
Solution Approach 1:
The patent applies local quality by modifying only the side chain regions of the polymer with partially fluorinated groups, while keeping the main polymer backbone unchanged. This localized modification selectively improves solubility and wetting properties without affecting the core polymer structure, enabling multilayered device construction while maintaining ease of processing through standard solution techniques.
Solution Approach 2:
The patent employs composite material principles by combining fluorinated side chains with conventional polymer backbones. This creates a hybrid material structure that integrates the beneficial properties of both components: the fluorinated groups provide enhanced solubility and wetting for multilayer construction, while the conventional backbone maintains processability and structural integrity.
3Reliability
If conventional materials are used in blue-emitting systems, then the device structure is simple, but lifetime and efficiency are limited
Solution Approach 1:
The patent applies local quality by introducing partially fluorinated side chains specifically designed to enhance device lifetime and efficiency in blue-emitting systems. This localized functional modification improves material stability and electron injection without requiring complete redesign of the polymer architecture, thus achieving enhanced reliability with minimal structural complexity.
Solution Approach 2:
The patent employs parameter changes by adjusting the fluorination degree and pattern in side chains to optimize the electronic and photophysical properties of the polymer. This tuning of molecular parameters improves charge injection efficiency and device stability, extending lifetime and enhancing efficiency in blue-emitting OLEDs without fundamentally changing the polymer structure.
Data Source
AI summary
The present invention relates to polymers comprising structural units having partially fluorinated substituents, to mixtures and formulations comprising the polymers according to the invention, to a process for the preparation of the polymers according to the invention, and to the use of the polymers according to the invention as functional materials in electronic devices.