Organic Electronic Device Mixed-Host Emission Layer for Lower Voltage
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Solution Overview
Problem
Existing organic electronic devices face issues with increased power consumption, reduced efficiency, and shortened lifespan due to the limitations of single light-emitting materials, necessitating the development of stable and efficient materials for the emission layer to improve luminous efficiency and extend device lifetime.
Innovation Solution
Incorporating compounds represented by Formulas 1, 2, and 3 into the emission layer to optimize energy levels, T1 values, and intrinsic material properties, thereby reducing driving voltage and enhancing charge balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light-emitting material is used in the emission layer, then the device structure is simple, but the luminous efficiency decreases and the maximum emission wavelength shifts toward longer wavelengths due to intermolecular interactions
Solution Approach 1:
The patent employs a host/dopant composite material system where a host material and dopant material are combined in the emission layer. The dopant material has a smaller energy band gap than the host, enabling efficient energy transfer from host to dopant. This composite approach achieves high luminous efficiency while maintaining desired emission wavelengths, resolving the contradiction between structural simplicity and performance.
Solution Approach 2:
The patent optimizes the energy band gap parameters of the dopant material relative to the host material. By selecting dopant materials with specific energy band gaps smaller than the host, the system achieves efficient exciton transfer and high luminous efficiency. This parameter optimization resolves the wavelength shift issue while maintaining efficiency.
2Productivity
If the luminous efficiency is increased, then the power consumption decreases, but the device lifespan is reduced due to Joule heating causing crystallization of organic materials
Solution Approach 1:
The patent carefully selects and optimizes the energy band gap parameter of the dopant material to be smaller than the host material's energy band gap. This parameter optimization enables efficient energy transfer that achieves high luminous efficiency while controlling the energy distribution to minimize harmful Joule heating effects, thereby extending device lifespan.
3Productivity
If a dopant material with smaller energy band gap than host is used, then the color purity and luminous efficiency are improved, but the emission wavelength shifts to the dopant's wavelength region
Solution Approach 1:
The patent systematically selects dopant materials with specific energy band gap parameters that are smaller than the host material but carefully controlled to achieve the desired emission wavelength. By adjusting the dopant's energy band gap parameter, the system achieves both high luminous efficiency and the target emission wavelength, resolving the contradiction between efficiency improvement and wavelength stability.
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 compounds improve emission efficiency and extend the device's lifetime by optimizing the organic layer's properties, leading to reduced power consumption and increased stability.
Implementation Method 1
when a small amount of a dopant having a smaller energy band gap than that of a host forming the emission layer is mixed into the emission layer, excitons generated in the emission layer are transferred to the dopant, thereby enabling light emission with high efficiency
Data Source
Figure 1~2
Figure 3
AI summary
The present invention provides an organic electronic device comprising a first electrode, a second electrode, and an organic layer between the first and second electrodes, and an electronic apparatus comprising the same. By using a mixture of the compounds of Formula 1 to Formula 3 of the present invention as a mixed-host in the organic layer, the driving voltage of the organic electronic device can be reduced, and the luminous efficiency and lifespan of the organic electronic device can be improved.