Orthogonal Solvent OLED Coating for Layer Dissolution
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Solution Overview
Problem
Existing methods for producing multilayer organic light-emitting diodes (OLEDs) using solution-processing face challenges such as layer dissolution and mixing in edge regions due to solvent compatibility issues, limiting the number of stackable layers and increasing production costs.
Innovation Solution
A method is developed to form multiple layers without initial dissolution by using orthogonal solvents, where the second layer is formed at a distance from the edge of the first layer, ensuring the second layer does not pass underneath, allowing for more than ten layers to be stacked and reducing the need for expensive vacuum processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple layers are processed from solution using orthogonal solvents, then the number of stackable layers is limited to four, but the manufacturing complexity and cost increase due to requiring multiple solvent types and vacuum processing
Solution Approach 1:
The patent divides the coating process into distinct zones: a first coating zone where the first layer is deposited, and a second coating zone positioned downstream where the second layer is deposited. This spatial segmentation allows each layer to be processed independently in its own zone, preventing solvent interaction between layers while enabling unlimited layer stacking through continuous processing
Solution Approach 2:
The patent transitions from a temporal layering approach (applying layers sequentially at the same location) to a spatial approach (applying layers at different positions along the coating direction). By arranging coating zones in sequence along the substrate travel path, the patent enables multiple layers to be stacked without requiring multiple solvent types or vacuum processing
2Stability of the object's composition
If successive layers are applied from polar and apolar solvents alternating, then layer dissolution is prevented, but the production efficiency decreases due to limited layer stacking capability
Solution Approach 1:
The patent applies a release layer between the first layer (processed from polar solvent) and the second layer (processed from apolar solvent). This release layer is applied in advance to prevent direct contact between incompatible solvents, thereby preventing layer dissolution while enabling continuous production with unlimited layer stacking
Solution Approach 2:
The release layer acts as an intermediary barrier between layers processed from orthogonal solvents. It prevents the polar solvent from dissolving the apolar layer and vice versa, while still allowing both layers to be deposited from solution. This mediator enables unlimited layer stacking without requiring alternating solvent types
3Strength
If crosslinking is used to improve layer connection, then layer adhesion is enhanced, but the OLED lifetime is reduced due to additional materials and crosslinking residues
Solution Approach 1:
The patent removes the need for crosslinking agents and their associated residues by using a release layer approach. The release layer provides sufficient adhesion between layers processed from orthogonal solvents without requiring chemical crosslinking, thereby eliminating the lifetime-reducing factors while maintaining layer connection
Solution Approach 2:
The release layer serves as a temporary, disposable barrier that fulfills its adhesion function and then can be removed or remains as a thin inert layer. It provides the necessary layer connection without the permanent degradation effects of crosslinking residues, offering a cleaner long-term solution for OLED lifetime
Data Source
AI summary
According to the present disclosure, a method for producing an optoelectronic component is provided. The method includes forming an organic first layer above a substrate, and forming an organic second layer above the first surface region. The first layer includes a surface. The surface is opposite the substrate and includes a first surface region and a second surface region. The second surface region surrounds the first surface region. The second surface region remains free of the second layer. The first layer and the second layer differ in their chemical composition.