Gradient-Doped Electron Transmission Region for OLED Panels
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Solution Overview
Problem
The electron transmission layer in existing organic light-emitting display devices cannot be simultaneously matched with both the cathode and the organic light-emitting layer, resulting in a poor luminescent effect.
Innovation Solution
An organic light-emitting display panel with a gradient-doped electron transmission region, comprising a first and second electron transmission layer doped with alkaline earth or rare earth metal elements, where the doping concentration of the first dopant in the first electron transmission layer is higher than in the second electron transmission layer, allowing for improved electron injection and luminescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electron transmission layer is doped with a certain doping concentration to improve electron transmission capacity, then the electron transmission capacity is improved, but the luminescent effect becomes poor due to mismatch with both the cathode and the organic light-emitting layer
Solution Approach 1:
The electron transmission layer is divided into multiple sub-layers with different doping concentrations. The first electron transmission layer has a higher doping concentration to match the cathode, while the second electron transmission layer has a lower doping concentration to match the organic light-emitting layer. This local variation in doping concentration allows each sub-layer to be optimally matched with its adjacent layers, resolving the contradiction between electron transmission capacity and luminescent effect.
2Reliability
If a single doping concentration is used in the electron transmission layer to enhance electron transmission, then electron transmission is improved, but the device complexity increases due to the need to balance matching with both cathode and organic light-emitting layer
Solution Approach 1:
The electron transmission layer is segmented into multiple sub-layers, each with a specific doping concentration optimized for its position. The first electron transmission layer is doped with a higher concentration to facilitate electron injection from the cathode, while the second electron transmission layer is doped with a lower concentration to ensure good interface with the organic light-emitting layer. This segmentation eliminates the need to find a single compromise doping concentration, thereby reducing the complexity of matching while maintaining high electron transmission capacity.
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 gradient-doping of the electron transmission region enhances the luminescent effect and display performance by optimizing electron injection and reducing the working voltage and improving the service life of the organic light-emitting component.
Implementation Method 1
the electrons move towards the organic light-emitting layer through the electron transmission layer
Implementation Method 2
the electron transmission region is doped with a first dopant, and the first dopant comprises alkaline earth metal elements or rare earth metal elements
Implementation Method 3
when the holes and the electrons meet each other in the organic light-emitting layer, they are recombined to release energy to let the organic light-emitting component emit light
Data Source
AI summary
Provided is an organic light-emitting display panel, including an array substrate and an organic light-emitting component. The array substrate includes a plurality of driving elements, and the organic light-emitting component is arranged to be associated with the driving element. The organic light-emitting component includes an anode and a cathode, and an organic functional layer therebetween. The organic functional layer includes an organic light-emitting layer, and an electron transmission region between the cathode and the organic light-emitting layer. The electron transmission region is doped with a first dopant comprising alkaline earth metal or rare earth metal elements. The electron transmission region includes first and second electron transmission layers. The doping concentrations C1, C2 of the first dopant in the first and second electron transmission layers satisfy: 0≤C2<C1. The electron transmission region can be at the same time matched with the cathode and the organic light-emitting layer.