Fluoro Group Polymer Prevents Layer Intermixing in OLED Wet Processing
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Solution Overview
Problem
Existing organic light-emitting devices face challenges in achieving optimal electrical characteristics and manufacturing simplicity due to issues with the intermixing of layers during the wet process, particularly with the formation of intermediate and emission layers.
Innovation Solution
Incorporating a fluoro group-containing polymer in the intermediate layer, which is substantially insoluble in the solvent used for the emission layer, preventing intermixing and maintaining layer thickness, and allowing for a straightforward manufacturing process without the need for cross-linking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional materials are used in the intermediate layer during wet process manufacturing, then the manufacturing process can be simplified, but the layers intermix and layer thickness is compromised
Solution Approach 1:
The patent applies local quality by selecting a specific material for the intermediate layer that has distinct properties (low solubility in polar solvents) compared to other layers. This localized material differentiation prevents intermixing at the interface between intermediate and emission layers while maintaining the overall simplicity of the wet process manufacturing approach.
2Adaptability or versatility
If conventional materials are used in the intermediate layer, then material selection is easier, but electrical characteristics and device performance deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully selecting materials with specific properties for the intermediate layer, particularly focusing on solubility parameters. The intermediate layer material is chosen to have low solubility in polar solvents used for the emission layer, preventing intermixing. Additionally, the material parameters are optimized to ensure good hole transport capability and appropriate energy levels, thereby achieving both material selection flexibility and excellent electrical characteristics.
3Stability of the object's composition
If cross-linking is implemented to prevent intermixing, then layer stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies the taking out principle by removing the cross-linking step from the manufacturing process. Instead of using cross-linking to prevent intermixing, the invention extracts this function and achieves it through careful material selection - specifically, choosing an intermediate layer material that is inherently insoluble or has very low solubility in the polar solvents used for the emission layer. This eliminates the need for additional cross-linking process steps while maintaining layer stability.
Data Source
AI summary
A fluoro group-containing compound, a fluoro group-containing polymer, an organic light emitting device including the polymer, and a method of manufacturing the organic light emitting device are provided.