Organic Electronic Device Electrode Defect Compensation
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Solution Overview
Problem
In organic electronic devices, such as OLEDs, low work function electrodes can react with moisture, leading to premature failure due to defects in the second conductive layer that fail to prevent moisture from reaching the first layer, especially when radiation needs to pass through.
Innovation Solution
A third conductive layer made of the same metallic element as the second layer is introduced to fill defects within the second conductive layer, and a plasma treatment process is used to form a compound from the second layer, enhancing the encapsulation and preventing moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second conductive layer is used to prevent moisture from reaching the first layer, then reliability is improved, but manufacturing precision deteriorates due to defects extending through the layer
Solution Approach 1:
The patent applies local quality by creating a multi-layer electrode structure where different layers serve different functions: the first conductive layer provides low work function for charge injection, the second conductive layer provides moisture barrier protection, and the third conductive layer fills defects to restore integrity. Each layer has optimized properties for its specific role, allowing the system to achieve both reliability and manufacturing tolerance.
Solution Approach 2:
The electrode is segmented into multiple conductive layers rather than using a single thick layer. This segmentation allows the second layer to be optimized for moisture barrier function while the third layer addresses manufacturing defects, resolving the contradiction between reliability and manufacturing precision by distributing functions across separate segments.
2Reliability
If the second conductive layer is made thicker to prevent moisture ingress, then reliability is improved, but radiation transmission deteriorates
Solution Approach 1:
The third conductive layer is strategically placed to fill only the defective regions of the second layer, providing localized moisture protection where needed. This allows the second layer to maintain its thin profile for radiation transmission while the third layer compensates for defects only in critical areas, resolving the contradiction between reliability and illumination intensity.
Solution Approach 2:
The third conductive layer is deposited to fill defects in the second layer before final device assembly and encapsulation. This preliminary action ensures that moisture barriers are established in advance, allowing the second layer to remain thin for radiation transmission while defects are pre-corrected.
3Manufacturing precision
If a third conductive layer is added to fill defects, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The third conductive layer is made of the same material as the second layer and is deposited using the same sputtering process, merging the fabrication methods. This approach improves manufacturing precision through defect compensation while minimizing the increase in device complexity by using identical materials and processes rather than introducing entirely new layers or techniques.
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 solution effectively extends the lifespan of organic electronic devices by preventing moisture from reaching the low work function material, even when the second conductive layer is defective, and allows for radiation transmission while maintaining device integrity.
Implementation Method 1
exposing the second layer to a first plasma to form a first compound from the second layer
Data Source
AI summary
An electronic device can include an organic active layer and an electrode. In one aspect, the electrode can further include a first layer that is conductive, and a second layer that is conductive. The second layer can include a defect extending at least partly through a thickness of the second conductive layer. The electrode can also include a third layer lying within and substantially filling the defect, wherein each of the second and third layers includes a same metallic element.In another aspect, a process for forming an electronic device can include forming an organic active layer and forming a first layer that is conductive and is part of an electrode. The process can also include forming a second layer and exposing the second layer to a first plasma to form a first compound from the second layer.