Organic Electronic Device Salt Interlayer Electron Injection
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Solution Overview
Problem
Organic electronic devices face challenges with embedded electrical components reducing light-emitting or light-receiving areas and the need for cathode layer materials that provide good electron-injection properties but are reactive, complicating the fabrication process.
Innovation Solution
A layered structure is formed with a cathode, a first organic layer containing a salt, and a second organic layer with an active material, where the anode is adapted to transmit radiation, and the salt layer improves electron-injection properties without requiring reactive materials, simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent cathode layer is used to allow light emission, then light transmission is improved, but electron-injection properties deteriorate
Solution Approach 1:
The patent introduces an intermediary layer between the transparent cathode and the active organic layer. This intermediary layer has intermediate optical and electrical properties that bridge the gap between the transparent cathode and the active layer, enabling both light transmission and adequate electron injection without requiring highly reactive materials
Solution Approach 2:
The patent employs composite material structures combining transparent cathode materials with organic interfacial layers. The composite structure integrates the optical transparency of the cathode with the electron-injection capabilities of the organic layer, achieving both functions simultaneously
2Reliability
If reactive cathode materials are used to provide good electron-injection properties, then electron injection is improved, but fabrication complexity increases due to encapsulation requirements
Solution Approach 1:
The patent replaces expensive, highly reactive cathode materials that require complex encapsulation with more stable, less reactive materials combined with organic interfacial layers. This substitution eliminates the need for complex encapsulation structures while maintaining electron-injection performance
Solution Approach 2:
The patent modifies the chemical and physical parameters of the cathode interface by introducing organic layers with tailored properties. This parameter change allows the use of stable, less reactive cathode materials while achieving the required electron-injection performance through the organic interfacial layer
3Adaptability or versatility
If electrical components are embedded in the substrate, then device functionality is improved, but light-emitting area is reduced
Solution Approach 1:
The patent transitions from bottom emission (through substrate) to top emission (through transparent cathode), utilizing a different spatial dimension for light output. This dimensional change allows electrical components to remain in the substrate without blocking the light-emitting area, as light now exits through the transparent cathode at the top
Data Source
AI summary
An organic electronic device to emit or receive radiation includes a cathode, a first layer including a salt, a second layer including an active organic material, and an anode. A method to manufacture an organic electronic device to emit or receive radiation includes depositing a cathode, depositing a first layer including a salt adjacent the cathode, depositing a second layer including an active organic material adjacent the first layer, and depositing an anode adjacent the second layer. An organic electronic device for emitting or receiving radiation includes a cathode, a first layer including a salt, a second layer including an active organic material, and an anode, the anode being adapted to transmit a significant portion of the radiation to or from the second layer.