Organic EL Hole Transporting Layer Compound for Emission Efficiency
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Solution Overview
Problem
Existing organic electroluminescence (EL) devices face challenges in achieving optimal performance, particularly in emission efficiency, due to limitations in the materials used for the hole transporting layer.
Innovation Solution
A compound represented by a specific formula is used as a material in the organic EL device, enhancing the emission efficiency by optimizing the structure and composition of the hole transporting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hole transporting layer materials are used, then the device structure is simple and manufacturing is easier, but the emission efficiency is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of hole transporting layer materials through systematic variation of substituents (R1-R25) and core structures (formulas 1-3). This structural parameter optimization enhances charge transport properties and emission efficiency without fundamentally changing the device architecture, thereby improving productivity while controlling complexity.
Solution Approach 2:
The patent employs composite materials by combining multiple organic compounds in the hole transporting layer, including compounds of formulas 1-3 along with other auxiliary materials. This composite approach synergistically improves emission efficiency by utilizing complementary properties of different materials while maintaining manageable device complexity through established composite material design principles.
2Productivity
If existing emitting materials are used, then the material selection is limited, but the emission efficiency and performance are insufficient
Solution Approach 1:
The patent utilizes parameter changes by systematically varying the chemical structure parameters of emitting materials, including substituent groups and core molecular frameworks. This enables precise tuning of emission characteristics and efficiency while maintaining a versatile material selection base, thereby improving productivity without sacrificing adaptability.
Solution Approach 2:
The patent applies local quality by introducing specific functional groups and substituents at particular positions within the molecular structure (indicated by R1-R25 in formulas 1-3). This localized structural modification optimizes specific properties such as charge transport and emission efficiency while preserving the overall material versatility and adaptability for different device configurations.
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 this compound improves the emission efficiency of organic EL devices, leading to better performance and efficiency in light emission.
Implementation Method 1
When a voltage is applied between the electrodes, electrons are injected from the cathode and holes are injected from the anode into a light emitting region. The injected electrons recombine with the injected holes in the light emitting region to form excited states. When the excited state returns to the ground state, the energy is released as light.
Data Source
AI summary
A compound represented by formula (1):wherein R1 to R8, R12 to R18, R21 to R25, R31 to R48, L1 to L3, and Ar are as defined in the specification,provides a high performance organic electroluminescence device which comprises a cathode, an anode and an organic layer between the cathode and the anode,wherein the organic layer comprises a light emitting layer and at least one layer of the organic layer comprises the compound.