OLED Light Extraction Layer with Protrusions and Auxiliary Interconnections
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Solution Overview
Problem
Organic light-emitting devices (OLEDs) suffer from low luminous power efficiency, with only about 25% of total luminous power being discharged externally, while the remaining 75% is isolated within the device, limiting their performance.
Innovation Solution
A method of fabricating electronic devices that includes a supporting substrate with auxiliary interconnections and a light extraction layer with protrusions, which enhances light extraction efficiency by forming a light extraction layer with a refractive index of 1.7 to 2.1 and auxiliary interconnections with lower resistance, allowing for improved electrical properties and uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional OLED structure is used, then the device is simple to manufacture, but light extraction efficiency is low with only 25% of luminous power discharged externally
Solution Approach 1:
The device is segmented into multiple functional layers including a light extraction layer with protrusions, auxiliary interconnections, substrate, first electrode, intermediate layer, and second electrode. This segmentation allows each layer to perform its specific function optimally, with the light extraction layer specifically designed to improve light extraction efficiency while other layers handle electrical and structural functions.
Solution Approach 2:
The light extraction layer introduces vertical protrusions that create additional light extraction pathways in the vertical dimension. These protrusions with irregular sizes and shapes increase the surface area and provide multiple interfaces for light extraction, transforming the conventional planar structure into a three-dimensional structure that enhances light extraction efficiency.
2Reliability
If auxiliary interconnections with lower resistance are introduced, then electrical properties and uniform light emission are improved, but manufacturing complexity increases
Solution Approach 1:
The auxiliary interconnections are formed on the supporting substrate before the light extraction layer is deposited. This preliminary action ensures that the low-resistance electrical pathways are established early in the fabrication process, allowing subsequent layers to be formed around them without disrupting the electrical connectivity. The auxiliary interconnections extend to the substrate to ensure stable electrical contact.
Solution Approach 2:
The auxiliary interconnections act as intermediary elements between the supporting substrate and the electrode structure. They provide dedicated low-resistance electrical pathways that mediate the connection between the substrate and the light-emitting elements, ensuring uniform current distribution and preventing IR drop phenomena that would otherwise occur in conventional structures.
3Loss of energy
If the light extraction layer with protrusions is formed, then light extraction efficiency is enhanced, but the fabrication process becomes more complex
Solution Approach 1:
The light extraction layer is designed with protrusions having specific parameter ranges: refractive index of 1.7 to 2.1, irregular sizes and shapes, and controlled heights. By optimizing these parameters, the layer achieves maximum light extraction efficiency through increased surface area and multiple light extraction interfaces, while the parameter control ensures the structure can be fabricated using standard manufacturing 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
The method significantly improves light extraction efficiency and achieves uniform brightness by preventing IR drop phenomena, resulting in enhanced electrical properties and improved luminous efficiency compared to devices without these features.
Implementation Method 1
a light extraction layer which is provided on the substrate and fills between the auxiliary interconnections
Implementation Method 2
auxiliary interconnections that are provided on the substrate... auxiliary interconnections with lower resistance
Data Source
AI summary
Provided are an electronic device and a fabrication method thereof. The electronic device according to the concept of the present invention includes auxiliary interconnections disposed on a substrate, a light extraction layer that is provided on the substrate and fills between the auxiliary interconnection, and a first electrode provided on the auxiliary interconnections and the light extraction layer, wherein the light extraction layer may have a first surface facing the substrate and a second surface opposite to the first surface, the first surface may have protrusions, and the auxiliary interconnections may include a material having a lower resistance than the first electrode. Since electrical properties of the electronic device are improved, uniform light emission characteristics may be realized.