OLED Light Emitting Layer Electron Blocking Solution Process
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Solution Overview
Problem
Existing OLED display devices face challenges in manufacturing large-size, high-definition displays with high production costs and high power consumption, particularly due to the limitations of vacuum thermal evaporation methods and the complexity of applying these methods to large and high-resolution displays.
Innovation Solution
The OLED display device incorporates a light emitting material layer with a first, second, and third light emitting material layer sequentially layered, where the first layer includes an electron blocking material, and the layers are formed using a solution process, allowing for a more cost-effective and efficient manufacturing process and reduced power consumption by including a white light emitting material layer with specific thickness ratios and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum thermal evaporation method is used to form light emitting material layers, then manufacturing precision and material deposition quality are improved, but manufacturing cost increases and applicability to large-size displays decreases
Solution Approach 1:
The patent replaces the vacuum thermal evaporation method (mechanical/physical deposition process) with a solution process where light emitting materials are dissolved in solvents and deposited through coating techniques. This substitution eliminates the need for vacuum equipment and complex deposition controls, significantly reducing manufacturing cost while enabling large-area production, though it requires optimizing solution formulation to maintain layer quality
Solution Approach 2:
The patent changes the physical state and chemical form of light emitting materials from pure solids requiring vaporization to dissolved states in solutions. This parameter change allows deposition through simpler liquid-based methods like spin coating or inkjet printing, making the process scalable to large displays while maintaining controllable film formation through solution concentration and drying parameters
2Device complexity
If conventional light emitting material layers are used without electron blocking material, then device structure is simpler, but power consumption increases due to inefficient charge injection
Solution Approach 1:
The patent segments the light emitting material layer into multiple functional sub-layers, including a dedicated electron blocking material layer positioned between the hole transporting layer and the light emitting layer. This segmentation allows each sub-layer to perform its specific function optimally, with the electron blocking layer preventing electron leakage and improving hole injection efficiency, thereby reducing overall power consumption despite increased structural complexity
Solution Approach 2:
The patent introduces an electron blocking material as an intermediary layer between the hole transporting layer and the light emitting layer. This intermediary component facilitates more efficient charge injection by blocking electrons from entering regions where they would cause recombination losses, while still allowing holes to pass through effectively, thus improving energy efficiency without requiring fundamental changes to the overall device architecture
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 approach enables the production of large-size, high-definition OLED displays with reduced manufacturing costs and lower power consumption, while ensuring uniform emission and improved performance through the use of a solution process for layer formation and the inclusion of an electron blocking material in the light emitting material layer.
Implementation Method 1
OLED display devices, which may be referred to as organic electroluminescent display devices, emit light due to the radiative recombination of an exciton after forming the exciton from an electron and a hole by injecting charges into a light emitting layer
Implementation Method 2
The light emitting material layer 4, the hole injecting layer 2, the hole transporting layer 3, the electron transporting layer 5 and the electron injecting layer 6 are formed by a vacuum thermal evaporation method, in which an organic material is selectively deposited
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
An organic light emitting diode includes a first electrode; a hole auxiliary layer on the first electrode; a light emitting material layer on the hole auxiliary layer and emitting white light; an electron auxiliary layer on the light emitting material layer; and a second electrode on the electron auxiliary layer, wherein the light emitting material layer includes a first light emitting material layer, a second light emitting material layer and a third light emitting material layer sequentially layered, and wherein the first light emitting material layer includes an electron blocking material.