Blue Emission Electron Transport Layer for OLED Efficiency
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Solution Overview
Problem
Organic electroluminescent devices face a trade-off between increased efficiency and driving voltage as the thickness of the emission layer increases, affecting color coordinate and lifespan.
Innovation Solution
Incorporating an electron transport layer with a blue emission material, which enhances blue and green light efficiency, reduces driving voltage, and improves color coordinates, while maintaining a balanced composition of 30 wt % to 70 wt % blue emission material within the electron transport layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thickness of the emission layer is increased, then the efficiency of the organic electroluminescent device is improved, but the driving voltage increases
Solution Approach 1:
The patent merges the electron transport function and blue emission function into a single integrated layer (electron transport layer containing blue emission material). This combines what were previously separate functions into one layer, allowing the device to achieve high efficiency without requiring increased layer thickness, thus avoiding the voltage increase penalty
Solution Approach 2:
The electron transport layer is designed to perform multiple functions simultaneously: electron transport and blue light emission. This multi-functionality allows the layer to contribute to both device efficiency and color quality without requiring additional layers that would increase overall thickness and driving voltage
2Productivity
If the thickness of the emission layer is increased, then the efficiency is improved, but the color coordinate deteriorates
Solution Approach 1:
By merging electron transport and blue emission functions into one layer, the patent achieves efficient blue light generation without the need for thicker emission layers. This prevents the color coordinate deterioration that would result from excessive emission layer thickness while maintaining high luminous efficiency
3Productivity
If the thickness of the emission layer is increased, then the efficiency is improved, but the lifespan decreases
Solution Approach 1:
The integrated electron transport layer with blue emission material achieves high efficiency without requiring increased thickness. This prevents the degradation and reduced lifespan that would result from thicker emission layers, thereby extending device operational life while maintaining high efficiency
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 solution achieves high efficiency, low driving voltage, excellent color coordinates, and extended lifespan for organic electroluminescent devices by optimizing the electron transport layer with a blue emission material, balancing efficiency and voltage requirements.
Implementation Method 1
Organic electroluminescent devices are self-emissive devices that emit light when a current is applied to a fluorescent or phosphorescent organic layer and electrons and holes combine in the organic layer
Data Source
AI summary
An organic electroluminescent device comprising an organic layer is provided. The organic layer is an electron transport layer comprising an electron transport material and a blue emission material. This electron transport layer causes an increase in the blue emission efficiency and lifespan of the organic electroluminescent device while improving efficiency in red and green ranges, a driving voltage, a color coordinate, and the lifespan of the organic electroluminescent device are not changed.