Organic Optoelectronic Component Intermediate Layer Particle Protection
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Solution Overview
Problem
Organic optoelectronic components, particularly surface light sources and detectors, are susceptible to three-dimensional disturbances such as particles, which can lead to spontaneous failures due to alignment inaccuracies and pressure during the manufacturing process, compromising their robustness and shelf life.
Innovation Solution
Incorporating intermediate layers with varying hardness and coefficients of thermal expansion between the organic functional layer stack and the thin-film encapsulation to prevent particles from being pressed into or through the electrodes, thereby enhancing the component's robustness without compromising other performance parameters like lifetime and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thin-film encapsulation is applied directly on the second electrode, then the component structure is simple and manufacturing is easy, but particles can be pressed into or through the electrode during the process, causing spontaneous failures
Solution Approach 1:
A first intermediate layer is introduced between the second electrode and the thin-film encapsulation. This intermediate layer acts as a mediator that prevents particles from being pressed into or through the second electrode during the encapsulation process, thereby reducing spontaneous failures while maintaining manufacturing simplicity
Solution Approach 2:
The patent uses a composite structure consisting of the second electrode, the first intermediate layer with different hardness and thermal expansion properties, and the thin-film encapsulation. This composite material approach allows the intermediate layer to absorb mechanical stress and prevent particle penetration, improving reliability without significantly complicating the manufacturing process
2Reliability
If intermediate layers with different hardness are introduced between the electrode and encapsulation, then robustness against particles is improved, but the device structure becomes more complex
Solution Approach 1:
The first intermediate layer serves as a protective intermediary between the second electrode and the thin-film encapsulation. By selecting materials with appropriate hardness differences and thermal expansion coefficients, this single intermediate layer provides robust protection against particle-induced failures while adding minimal structural complexity
Solution Approach 2:
The patent changes the physical parameters (hardness and thermal expansion coefficient) of the intermediate layer relative to the adjacent layers. This parameter optimization allows the intermediate layer to prevent particle penetration and reduce spontaneous failures without requiring multiple complex layers, thus limiting the increase in device complexity
Data Source
AI summary
The invention relates to an organic optoelectronic component comprising a substrate (101) on which a first electrode (102), then an organic functional layer stack (103) having at least one organic optoelectronic layer, and then a second electrode (104) are successively arranged. A thin film encapsulation (107) is arranged over the second electrode (104) and in addition to the second electrode (104), at least one first intermediate layer (121) having a hardness which is different from the layer which is directly adjacent thereto is arranged between the organic functional layer stack (103) and the thin-film encapsulation (107).