OLED Insulating Layer Detaches Electrode Around Hole Defects
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Solution Overview
Problem
Organic electroluminescent arrangements face high failure rates due to leakage currents and short-circuits caused by hole defects, particularly in large-area OLEDs, which are not effectively addressed by existing moisture and oxygen protection methods.
Innovation Solution
An electroluminescent arrangement with an electrically insulating layer that chemically reacts with the organic electroluminescent layer to detach the second electrode from the organic layer around hole defects, reducing the risk of short-circuits by increasing the distance between electrodes and using materials with high electrical resistance and dielectric strength, such as polymers like epoxy resins, to prevent leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical encapsulation is used to protect against moisture infiltration, then the degradation from dark region growth is reduced, but the overall depth of organic LEDs increases and mechanical flexibility is lost
Solution Approach 1:
The patent extracts the encapsulation function from a separate mechanical encapsulation layer and integrates it into the organic LED structure itself by forming an encapsulating layer directly within the device architecture, thereby providing moisture protection without increasing overall depth
Solution Approach 2:
The patent combines the encapsulation function with the existing organic LED layers by forming an encapsulating layer that is integrated into the device structure, merging the protection function with the active layers rather than adding a separate external encapsulation component
2Reliability
If mechanical encapsulation is used to protect against moisture infiltration, then the degradation from dark region growth is reduced, but mechanical flexibility of organic layers is stopped
Solution Approach 1:
The patent removes the need for rigid mechanical encapsulation by extracting the encapsulation function and implementing it through a thin encapsulating layer formed within the organic LED structure, thereby maintaining mechanical flexibility while providing moisture protection
Solution Approach 2:
The patent employs a thin encapsulating layer formed directly within the organic LED structure that provides moisture protection while maintaining the mechanical flexibility of the organic layers, replacing rigid mechanical encapsulation with a flexible thin-film solution
3Reliability
If protective layers are applied in vacuum to prevent moisture diffusion, then brightness decline is reduced, but production costs increase due to additional vacuum processing
Solution Approach 1:
The patent combines the encapsulation function with the existing vacuum deposition process used for forming organic layers, so that the encapsulating layer is formed during the same vacuum processing step rather than requiring a separate vacuum processing operation, thereby avoiding additional production costs
Solution Approach 2:
The patent makes the vacuum processing serve multiple functions by using it both to deposit the organic luminescent layers and to form the encapsulating layer, thereby providing moisture protection without requiring additional vacuum processing steps or increasing production costs
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
Significantly reduces the failure rate of organic electroluminescent arrangements by minimizing the risk of short-circuits and leakage currents, allowing for the production of large-area OLEDs with improved reliability and reduced production costs.
Implementation Method 1
an electrically insulating layer of a material that is chemically reactive with the organic electroluminescent layer, suitable for detaching the second electrode from the organic electroluminescent layer in a confined region around a hole defect
Implementation Method 2
using materials with high electrical resistance and dielectric strength, such as polymers like epoxy resins, to prevent leakage currents
Data Source
AI summary
An electroluminescent arrangement comprising a substrate (1), at least one layered structure applied to the substrate that comprises at least one organic electroluminescent layer (2) for emitting light (10) that is arranged between a first electrode (3) arranged on the side on which the substrate is situated and a second electrode (4) arranged on the side of the electroluminescent layer (2) remote from the substrate, and an electrically insulating layer (5) of a material that is chemically reactive with the organic electroluminescent layer (2), suitable for detaching the second electrode (4) from the organic electroluminescent layer (2) in a confined region around a hole defect.