White OLED Device with Quantum Dot and Organic Emissive Layers
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Solution Overview
Problem
Current white OLED devices face challenges in achieving high light emission efficiency and cost-effective manufacturing while maintaining excellent display performance for flat panel displays and televisions.
Innovation Solution
A white OLED device structure comprising multiple emissive layers, where at least one layer is made of quantum dots and another of organic light emission material, with a charge generation layer formed by mixing p-type and n-type organic semiconductors to combine light emissions and enhance brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a white OLED device uses a single emissive layer with quantum dots, then the device structure is simple, but the light emission efficiency and brightness are insufficient
Solution Approach 1:
The emissive layer is divided into multiple sub-layers (first emissive layer with quantum dots, second emissive layer with organic materials) to achieve different light emission functions. This segmentation allows each layer to be optimized independently, improving overall light emission efficiency while maintaining manageable structural complexity
Solution Approach 2:
The patent combines quantum dot materials with organic light emission materials in a multi-layer emissive structure. This composite approach leverages the high quantum efficiency of quantum dots and the favorable electroluminescence properties of organic materials, achieving superior light emission efficiency and brightness
2Productivity
If a white OLED device uses multiple emissive layers with quantum dots and organic materials, then the light emission efficiency and brightness improve, but the device structure becomes more complex
Solution Approach 1:
The emissive layer is divided into multiple sub-layers (first emissive layer with quantum dots, second emissive layer with organic materials) to achieve different light emission functions. This segmentation allows each layer to be optimized independently, improving overall light emission efficiency while maintaining manageable structural complexity
Solution Approach 2:
The charge generation layer serves multiple functions: generating charges for both emissive layers, transporting holes to the first emissive layer and electrons to the second emissive layer, and facilitating efficient charge injection. This multi-functionality reduces the need for additional separate components, managing overall device complexity
3Productivity
If quantum dots are used as light emission material, then the quantum efficiency is high, but the manufacturing cost increases
Solution Approach 1:
The patent merges quantum dot light emission with organic material electroluminescence in a single device structure. This combination allows the use of commercially available organic transporting layers with the quantum dot light emission layer, reducing the need for entirely new manufacturing processes and materials, thereby controlling manufacturing costs while achieving high quantum efficiency
Solution Approach 2:
The patent optimizes the composition and structure of the charge generation layer (using specific ratios of p-type and n-type organic semiconductors) to enhance charge generation and transport efficiency. This parameter optimization improves the overall device performance and quantum efficiency without requiring expensive material changes
4Ease of manufacture
If organic light emission materials are used, then the device structure is simple and manufacturing is easier, but the light emission efficiency and stability are insufficient
Solution Approach 1:
The patent combines quantum dot light emission with organic material electroluminescence in a multi-layer emissive structure. This composite approach leverages the high quantum efficiency of quantum dots and the favorable electroluminescence properties of organic materials, achieving superior light emission efficiency and brightness while maintaining ease of manufacture through the use of commercially available organic transporting layers
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 configuration results in high light emission efficiency, low manufacturing costs, and improved display performance for flat panel displays and televisions by combining the advantages of quantum dots and organic light emission materials.
Implementation Method 1
at least one light emissive layer is made of a quantum dot... the quantum LED has quantum efficiency as high as 90%
Implementation Method 2
at least one light emissive layer is made of an organic light emission material... shows excellent displaying performance
Implementation Method 3
a charge generation layer formed by mixing p-type and n-type organic semiconductors to combine light emissions
Data Source
AI summary
The present invention provides a structure of a white OLED device that includes a plurality of emissive layers, of which at least one emissive layer is made of a quantum dot and at least one emissive layer is made of an organic light emission material so as to combine the advantages of the quantum dot and the organic light emission material, where the manufacturing cost is low, the utilization of material is high, and the light emission efficiency is high thereby increasing the brightness of a display device and providing excellent performance for use in flat panel display devices, televisions, and other fields of display.