Organic Light-Emitting Device Intermediate Layer for Lithography Stability
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Solution Overview
Problem
High-resolution light-emitting devices face challenges in achieving favorable characteristics and high reliability due to the influence of oxygen and water during lithography processing, which can increase driving voltage and reduce current efficiency.
Innovation Solution
A light-emitting device structure incorporating a metal, a first organic compound with a phenanthroline ring, and a second organic compound with a π-electron deficient heteroaromatic ring, forming an intermediate layer that interacts to create a donor level, reducing the impact of oxygen and water and enhancing electron injection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lithography method is used to process the organic semiconductor film, then finer patterns and higher resolution can be achieved, but the influence of oxygen or water during processing causes significantly increased driving voltage and greatly reduced current efficiency
Solution Approach 1:
An intermediate layer is introduced between the first light-emitting layer and the second light-emitting layer. This intermediate layer includes a metal, a first organic compound, and a second organic compound, where the first organic compound and the metal form a donor level by interacting with each other and function as an electron donor with respect to the second organic compound. This intermediary structure protects the organic semiconductor film from oxygen and water during lithography processing while maintaining electrical performance.
Solution Approach 2:
The intermediate layer is constructed as a composite material system comprising a metal, a first organic compound with a phenanthroline ring having an electron-donating group, and a second organic compound with a π-electron deficient heteroaromatic ring. This composite structure provides both protection against environmental factors and efficient electron transport properties.
2Manufacturing precision
If a lithography method is used to process the organic semiconductor film, then finer patterns can be formed, but the driving voltage is significantly increased due to exposure to oxygen or water
Solution Approach 1:
The intermediate layer serves as a protective intermediary that shields the organic semiconductor film from oxygen and water during lithography processing. This prevents oxidation and degradation that would otherwise increase driving voltage, allowing fine pattern formation without energy efficiency penalties.
Solution Approach 2:
The intermediate layer creates a protected, inert environment for the organic semiconductor film during lithography processing. By preventing direct exposure to oxygen and water, the layer maintains the electrical properties of the organic material, thereby keeping driving voltage at acceptable levels despite the use of lithography methods.
3Reliability
If the intermediate layer includes a metal and organic compounds forming a donor level, then electron injection efficiency is enhanced, but the device structure becomes more complex
Solution Approach 1:
Multiple functions are merged into the intermediate layer: it provides protection from environmental factors, establishes a donor level for efficient electron injection, and maintains structural integrity. By combining the metal, first organic compound, and second organic compound in a single intermediate layer, the design achieves high electron injection efficiency without proportionally increasing device complexity.
Solution Approach 2:
The intermediate layer performs multiple functions simultaneously: it acts as a protective barrier against oxygen and water, provides a donor level for electron injection, and serves as an interface between the light-emitting layers. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device 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
The proposed structure reduces driving voltage and improves emission efficiency while maintaining high reliability by stabilizing the intermediate layer against moisture and oxygen, facilitating efficient electron injection and transport.
Implementation Method 1
the first organic compound and the metal form a donor level by interacting with each other and function as an electron donor with respect to the second organic compound
Implementation Method 2
the influence of oxygen or water in the air and a chemical solution or water used during the process has sometimes caused a light-emitting device to have a significantly increased driving voltage or greatly reduced current efficiency
Data Source
AI summary
To provide a light-emitting device with favorable characteristics. A plurality of light-emitting devices are over one insulating surface. Each of the plurality of light-emitting devices includes a first electrode, a second electrode, and an organic compound layer between the first electrode and the second electrode. The first electrodes of the plurality of light-emitting devices are separate from each other. The second electrode is shared by the plurality of light-emitting devices. The organic compound layer includes a first light-emitting layer, a second light-emitting layer, and an intermediate layer between the first light-emitting layer and the second light-emitting layer. Contours of the first light-emitting layer, the intermediate layer, and the second light-emitting layer are aligned or substantially aligned with each other in each of the plurality of light-emitting devices. The intermediate layer includes a first layer. The first layer is a mixed layer including a metal, a first organic compound, and a second organic compound. The first organic compound includes a phenanthroline ring having an electron-donating group. The second organic compound includes a π-electron deficient heteroaromatic ring.