Organic Luminous Layer Stack for Large-Area Transmissive Lighting
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Solution Overview
Problem
Semiconductor-based light-emitting diodes are expensive, particularly for large-area applications, and are not flexible or transmissive to visible light, limiting their use in cost-effective and versatile lighting solutions.
Innovation Solution
An organic luminous means comprising a substrate with electrodes and an organic layer stack that emits light, where the electrodes and substrate are designed to be transmissive to visible light, allowing for flexible and cost-effective production, enabling applications such as illumination, information representation, and decorative uses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If semiconductor-based light-emitting diodes are used for large-area illumination, then illumination area is increased, but cost increases significantly
Solution Approach 1:
The patent replaces expensive semiconductor-based LEDs with organic light-emitting components that can be manufactured more cost-effectively using solution-based processes. The organic layers are deposited on flexible substrates using techniques like spin-coating or printing, enabling large-area production at lower costs compared to semiconductor fabrication processes.
Solution Approach 2:
The invention changes the material parameters from inorganic semiconductor materials to organic materials, which allows for different fabrication methods (solution processing vs. vacuum deposition). This parameter change enables cost-effective large-area manufacturing while maintaining light-emitting functionality.
2Illumination intensity
If semiconductor-based light-emitting diodes are used, then light emission is achieved, but flexibility and transmissivity to visible light are lost
Solution Approach 1:
The patent employs flexible substrates (such as plastic films or thin glass) instead of rigid semiconductor wafers. The organic light-emitting layers are deposited as thin films on these flexible substrates, enabling the device to be bent or conform to curved surfaces while maintaining light emission capabilities.
Solution Approach 2:
The invention uses composite structures combining organic light-emitting materials with transparent or translucent substrates and electrode materials. This composite approach allows the device to simultaneously achieve light emission, flexibility, and visible light transmissivity, which semiconductor-based LEDs cannot provide.
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 organic luminous means provides a cost-effective, flexible, and transmissive lighting solution suitable for various applications, including public spaces, furniture, and vehicles, offering variable color impressions and efficient illumination.
Implementation Method 1
an organic layer stack within an active region of the substrate between the first and the second electrode, wherein the organic layer stack comprises at least one organic layer which is suitable for generating light
Data Source
AI summary
An organic luminous means and an illumination device comprising such a luminous means are described. An optical display apparatus, emergency lighting, motor vehicle interior lighting, an item of furniture, a construction material, a glazing and a display comprising such a luminous means and, respectively, comprising an illumination device having such a luminous means are also described.