Light Scattering Electrode for OLED Luminance
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Solution Overview
Problem
The luminance of organic light emitting diodes (OLEDs) is limited by the maximum current density, and existing production methods for optoelectronic components are complex and costly, requiring separate layers for current distribution and light coupling-out, which increases production costs and complexity.
Innovation Solution
A light scattering electrode is developed, comprising an optically transparent or translucent matrix with embedded particles of higher refractive index, which serves both as an electrical conductor and a light coupling-out layer, combining these functions in a single layer to enhance luminance and simplify production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate layers are used for current distribution and light coupling-out, then the functionality is more specialized, but the production process becomes more complex and costly
Solution Approach 1:
The patent combines the current distribution layer and light coupling-out layer into a single integrated electrode structure. This electrode contains both conductive materials for electrical function and scattering particles for optical function, eliminating the need for separate layers and simplifying the production process while maintaining both specialized functions within one component
Solution Approach 2:
The electrode is designed to perform multiple functions simultaneously: it serves as both the current distribution layer and the light coupling-out layer. By incorporating both conductive and scattering properties into a single layer, the electrode becomes a multi-functional component that reduces overall device complexity and production costs
2Reliability
If multiple layers are used for current distribution and light coupling-out, then the optical and electrical functions are optimized separately, but the production costs increase
Solution Approach 1:
The patent merges the optimization of optical and electrical functions into a single electrode layer. By incorporating both conductive materials and scattering particles simultaneously, the design achieves functional optimization without requiring multiple separate layers, thereby reducing material costs, deposition steps, and overall production expenses
3Illumination intensity
If the maximum current density is increased to enhance luminance, then the brightness improves, but the heat generation and efficiency limitations worsen
Solution Approach 1:
The patent changes the optical parameters of the electrode by incorporating scattering particles with specific refractive indices. This modifies the light extraction efficiency, allowing more light to be coupled out at lower current densities, thereby reducing heat generation while maintaining or enhancing luminance output
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 light scattering electrode increases luminance by optimizing light scattering and conductivity, reducing production costs and complexity by integrating light coupling-out and electrical conductivity into a single layer, thereby enhancing the efficiency and brightness of OLEDs.
Implementation Method 1
Particles are embedded in the matrix, said particles having a refractive index that is greater than the refractive index of the at least one matrix material. A difference in refractive index between the at least one matrix material and the particles embedded into the matrix is at least 0.05.
Implementation Method 2
The electrically conductive layer composed of matrix and embedded particles that is formed in the manner described above has the functionality of an electrode for forwarding electrical energy
Data Source
AI summary
Various embodiments may relate to an optoelectronic component, including an organic functional layer structure, and an electrode on or above the organic functional layer structure. The electrode is electrically conductively coupled to the organic functional layer structure. The electrode includes an optically transparent or translucent matrix including at least one matrix material, and particles embedded into the matrix. The particles have a refractive index that is greater than the refractive index of the at least one matrix material. A difference in refractive index between the at least one matrix material and the particles embedded into the matrix is at least 0.05.