Aromatic Amine Capping Layer for OLED Light Extraction
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Solution Overview
Problem
Current OLED display technologies face challenges in achieving high light-extraction efficiency and low power consumption while maintaining long device life and stability, particularly in the optimization of the capping layer materials which affect light-coupling efficiency and thermal stability.
Innovation Solution
A light-emitting device is developed with a capping layer composed of aromatic amines compounds, specifically designed to enhance light-extraction efficiency by optimizing the refractive index and glass transition temperature, thereby improving the overall performance and stability of the OLED display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional capping layer materials are used in OLED, then the device structure is simple and easy to manufacture, but the light-extraction efficiency is insufficient and power consumption is high
Solution Approach 1:
The patent changes the refractive index parameter of the capping layer material by selecting aromatic amine compounds with specific molecular structures (containing electron-donating groups like dialkylamino or diarylamino groups). This parameter change enables more effective light extraction and reduces power consumption while maintaining ease of manufacture through conventional OLED fabrication processes
Solution Approach 2:
The patent employs composite material design by combining aromatic amine compounds with specific functional groups (electron-donating groups) to create a capping layer that achieves both high light-extraction efficiency and low power consumption. The composite molecular structure integrates multiple functional moieties that work synergistically to optimize optical and electrical properties
2Ease of manufacture
If conventional capping layer materials are used in OLED, then the manufacturing process is simple, but the device life and stability are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameter of the capping layer by introducing aromatic amine compounds with electron-donating groups, which enhance the material's thermal stability and chemical inertness. This parameter change improves device reliability and longevity while maintaining compatibility with standard manufacturing processes
Solution Approach 2:
The patent uses organic compound materials that can be deposited through conventional vapor deposition techniques, replacing more complex inorganic or multi-layer capping structures. These organic materials provide sufficient stability for the device lifetime while being easier and cheaper to manufacture
3Loss of energy
If the capping layer refractive index is increased to improve light extraction, then light-extraction efficiency improves, but the material selection and manufacturing complexity increase
Solution Approach 1:
The patent systematically varies the refractive index parameter by selecting from a family of aromatic amine compounds with different substituent groups (dialkylamino, diarylamino groups with varying alkyl or aryl chains). This controlled parameter change within a single chemical family achieves optimal light extraction without requiring complex multi-material systems
Solution Approach 2:
The aromatic amine compound structure serves multiple functions simultaneously: it provides the required high refractive index for light extraction, ensures thermal and chemical stability, and maintains compatibility with standard OLED fabrication processes. This multi-functionality reduces overall device complexity despite the enhanced optical performance
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 use of aromatic amines in the capping layer significantly enhances light-extraction efficiency, prolongs device life, and maintains stable voltage performance, addressing the limitations of existing OLED technologies.
Implementation Method 1
optimizing the refractive index and glass transition temperature, thereby improving the overall performance and stability of the OLED display
Implementation Method 2
optimizing the refractive index and glass transition temperature, thereby improving the overall performance and stability of the OLED display
Data Source
AI summary
The present application provides a light-emitting device and a display device, which relates to the field of display technology, including: a substrate; a first electrode and a second electrode located on the substrate: a light-emitting layer located between the first electrode and the second electrode; and a capping layer located on a side of the second electrode away from the light-emitting layer, wherein the capping layer includes a compound of aromatic amines, and a structure of the compound of aromatic amines includes one of following two structures 1:and the capping layer made of the compound of aromatic amines has a high refractive index and high stability, such that when the light-emitting device is used, the light-outlet efficiency of the device may be improved, and the service life of the device may be prolonged.