OLED Contact Angle Control via Plasma Treatment
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Solution Overview
Problem
The optical efficiency of organic light-emitting display apparatuses is limited, hindering the improvement of image quality due to suboptimal contact angles between the electron injection layer and the first electrode, which can lead to short-circuiting or decreased electrical characteristics.
Innovation Solution
An organic light-emitting apparatus is designed with a substrate, a cathode first electrode, an electron injection layer containing Mg, and an anode second electrode, where the contact angle between the electron injection layer and the first electrode is maintained between 10° to 70°, and plasma or UV treatments are used to control this angle, ensuring proper contact and preventing short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electron injection layer contacts the first electrode at a suboptimal contact angle, then the manufacturing process is simpler, but the optical efficiency and image quality are limited
Solution Approach 1:
The patent applies parameter changes by optimizing the contact angle between the electron injection layer and the first electrode to a specific range (10° to 70°). This parameter optimization resolves the contradiction by achieving both manufacturing feasibility and improved optical efficiency, as the controlled contact angle ensures proper electron injection while maintaining manufacturing simplicity.
Solution Approach 2:
The patent employs preliminary action through plasma treatment or UV treatment of the first electrode surface before forming the electron injection layer. This preliminary surface modification prepares the electrode with optimal surface properties that enable the electron injection layer to form the desired contact angle range, thereby ensuring both manufacturing ease and high optical efficiency without requiring complex subsequent adjustments.
2Device complexity
If the contact angle is not controlled, then the device complexity is reduced, but short-circuiting and decreased electrical characteristics occur
Solution Approach 1:
The patent resolves this contradiction by establishing a specific contact angle parameter range (10° to 70°) between the electron injection layer and the first electrode. This parameter specification ensures reliable electrical characteristics and prevents short-circuiting while avoiding the need for complex active control mechanisms, as the angle control is achieved through process optimization rather than additional device components.
Solution Approach 2:
The patent applies preliminary surface treatment (plasma or UV) to the first electrode before electron injection layer formation. This preliminary action modifies the surface properties to inherently promote the desired contact angle range, thereby ensuring reliable electrical characteristics without requiring complex in-process monitoring or control mechanisms during electron injection layer deposition.
3Reliability
If plasma treatment is applied to control contact angle, then the electron injection characteristic is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs plasma treatment as a preliminary action performed on the first electrode surface before electron injection layer formation. This preliminary treatment enhances electron injection characteristics by modifying surface properties to achieve the optimal contact angle range (10° to 70°), while the treatment being a standard pre-processing step minimizes the increase in overall manufacturing complexity.
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
This configuration enhances the electron injection characteristic and image quality by maintaining optimal contact angles, preventing short-circuiting and ensuring effective electrical application to the organic emission layer.
Implementation Method 1
Plasma treatment can be performed between the forming of the first electrode and the forming of the electron injection layer
Implementation Method 2
Ultra violet (UV) treatment can be performed between the forming of the first electrode and the forming of the electron injection layer
Data Source
AI summary
An organic light-emitting apparatus includes a substrate; a first electrode formed on the substrate, where the first electrode is a cathode, an electron injection layer formed to contact an upper surface of the first electrode and including Mg, an intermediate layer formed on the electron injection layer and including an organic emission layer, and a second electrode which is formed on the intermediate layer and is an anode.