Organic Electroluminescence Device Emission Layer Composite Host Dopant
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Solution Overview
Problem
Current organic electroluminescence devices face challenges in reducing driving voltage and enhancing light-emitting efficiency and lifespan, as existing materials do not stably achieve these features.
Innovation Solution
The development of an organic electroluminescence device incorporating a specific emission layer composition, including a first host represented by Formula 1 and a second host represented by one of Formulas 2-1 to 2-5, along with a dopant, which improves charge balance and emission efficiency, and extends device life by forming an exciplex with new energy levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional emission layer materials are used, then device structure is simple, but driving voltage is high and emission efficiency is low
Solution Approach 1:
The emission layer uses a composite material system consisting of a host compound (Formula 1) and a dopant compound (Formula 2-1 to 2-5) in specific weight ratios (95:5 to 5:95). This composite approach enables simultaneous achievement of low driving voltage (2.5-4.5V) and high emission efficiency by combining the electronic properties of different materials, resolving the contradiction between simple structure and improved performance.
Solution Approach 2:
The patent optimizes specific parameters including the weight ratio of host to dopant (95:5 to 5:95), the molecular structure parameters of the compounds (substituents Ra to Rd, ring structures), and the energy level parameters of the emission layer. These parameter changes enable tuning of the emission characteristics to achieve low driving voltage and high efficiency while maintaining material composition simplicity.
2Reliability
If conventional emission materials are used, then material selection is easy, but light-emitting efficiency and device lifespan are insufficient
Solution Approach 1:
The emission layer employs a composite material system with host compound (Formula 1) and dopant compound (Formula 2-1 to 2-5) in controlled weight ratios. This composite structure enhances device lifespan and emission efficiency through synergistic material properties while maintaining relatively simple composition, addressing the contradiction between reliability improvement and compositional complexity.
Solution Approach 2:
The patent optimizes critical parameters including the weight ratio of host to dopant (95:5 to 5:95), molecular structure parameters (substituents Ra to Rd, ring structures), and energy level parameters. These parameter optimizations enable the emission layer to achieve high reliability and extended device lifespan while keeping the material system manageable in complexity.
3Productivity
If single host material is used, then emission layer is simple, but charge balance and emission efficiency are poor
Solution Approach 1:
The emission layer uses a composite material system consisting of a host compound (Formula 1) and a dopant compound (Formula 2-1 to 2-5) in specific weight ratios (95:5 to 5:95). This composite approach enables simultaneous achievement of low driving voltage (2.5-4.5V) and high emission efficiency by combining the electronic properties of different materials, resolving the contradiction between simple structure and improved performance.
Solution Approach 2:
The patent optimizes specific parameters including the weight ratio of host to dopant (95:5 to 5:95), the molecular structure parameters of the compounds (substituents Ra to Rd, ring structures), and the energy level parameters of the emission layer. These parameter changes enable tuning of the emission characteristics to achieve low driving voltage and high efficiency while maintaining material composition simplicity.
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 a device with lower driving voltage, higher emission efficiency, and extended lifespan by facilitating favorable hole and electron injection and charge recombination in the emission layer.
Implementation Method 1
a specific emission layer composition, including a first host represented by Formula 1 and a second host represented by one of Formulas 2-1 to 2-5, along with a dopant, which improves charge balance and emission efficiency, and extends device life by forming an exciplex with new energy levels
Implementation Method 2
an organic electroluminescence device including a first electrode; a second electrode on the first electrode; and an emission layer between the first electrode and the second electrode
Data Source
AI summary
An organic electroluminescence device and a method of manufacturing an organic electroluminescence device, the device including a first electrode; a second electrode on the first electrode; and an emission layer between the first electrode and the second electrode, wherein the emission layer includes a first host represented by the following Formula 1, and a second host represented by one of the following Formula 2-1 to Formula 2-5: