OLED Substrate Electrode with Conductive Scattering Particle Layer
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Solution Overview
Problem
Conventional organic light-emitting diodes (OLEDs) face challenges in achieving efficient and homogeneous light emission over large surfaces due to the high cost and limited electrical conductivity of particle layers used for light outcoupling, which restricts the maximum size of the OLEDs.
Innovation Solution
An electrically conductive particle layer, combined with a grid structure, is applied directly on the substrate, eliminating the need for a separate anode and allowing for efficient light outcoupling, where the particle layer forms a substrate electrode with scattering and conductive particles, enhancing conductivity and light scattering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional particle layer is used for light outcoupling, then light scattering capability is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent applies composite materials by combining scattering particles (for light outcoupling) with conductive particles (for electrical conductivity) in the particle layer. This composite structure allows the layer to simultaneously achieve both light scattering capability and electrical conductivity, resolving the contradiction between these two properties.
2Area of stationary object
If the OLED surface area is increased, then light emission coverage is improved, but current distribution uniformity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the electrode structure into a grid pattern with multiple conductive lines. This segmented grid structure enables better current distribution across large surface areas by providing multiple current paths, thus maintaining current distribution uniformity even as the OLED surface area increases.
3Adaptability or versatility
If a separate anode and particle layer are used, then functional separation is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the anode and particle layer into a single combined structure. The particle layer serves dual functions as both the anode (electrode) and the light scattering layer, eliminating the need for a separate anode structure. This reduces device complexity while maintaining the necessary functional separation through the multi-functional design.
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
This solution simplifies production, enables the creation of efficiently and homogeneously emitting OLEDs with larger surface areas by improving electrical conductivity and light outcoupling efficiency, while reducing production costs.
Implementation Method 1
The scattering particles are equipped for light scattering. In particular, scattering of the light generated in the organic layer sequence when the organic light-emitting diode is used as intended takes place via the scattering particles.
Implementation Method 2
The conductive particles are electrically conductive. The electrical conductivity of the particle layer is determined and adjusted substantially via the conductive particles.
Data Source
AI summary
In one embodiment the organic light-emitting diode includes a substrate having a substrate upper side, an electrically conductive grid structure for a current distribution and an electrically conductive particle layer, which are located at the substrate upper side. The grid structure may be embedded in the particle layer. An organic layer sequence for generating the radiation is located directly on the particle layer. A covering electrode is attached to the organic layer sequence. The particle layer comprises scattering particles having a first average diameter and electrically conductive particles having a smaller second average diameter. The scattering particles are densely packed together with the conductive particles. The particle layer forms, together with the grid structure, a substrate electrode for the organic layer sequence.