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 intermolecular interactions and inefficient charge balance in the emission layer, necessitating the development of materials that enhance thermal stability and charge balance.
Innovation Solution
Incorporation of compounds represented by Formulas 1, 2, and 3 in the emission layer to optimize energy levels, T1 values, and intrinsic material properties, thereby improving efficiency and reducing driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single material is used as an emission material, then the device structure is simple, but the maximum emission wavelength shifts toward longer wavelength, color purity deteriorates, and luminous efficiency reduces
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 color purity and luminous efficiency while maintaining reasonable device structure complexity.
2Loss of energy
If efficiency is increased, then driving voltage decreases, but Joule heating increases causing organic material crystallization
Solution Approach 1:
The patent optimizes multiple parameters including energy levels, T1 values, charge mobility, and interfacial characteristics of the organic layer materials. By carefully selecting and adjusting these parameters, the device achieves high efficiency while controlling Joule heating effects and preventing organic material crystallization, thus maintaining compositional stability.
3Manufacturing precision
If a host/dopant system is used to improve color purity and luminous efficiency, then energy transfer to dopant is enhanced, but the emission wavelength shifts to the dopant region
Solution Approach 1:
The patent carefully selects dopant materials with appropriate energy band gaps smaller than the host material, enabling controlled energy transfer. By adjusting the dopant concentration and selecting dopants with specific energy levels, the emission wavelength can be precisely controlled in the desired region while maintaining high color purity through the host/dopant energy transfer mechanism.
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 in the emission layer reduce driving voltage and enhance both efficiency and lifespan of the organic electronic device.
Implementation Method 1
organic electroluminescence refers to a phenomenon in which electrical energy is converted into light energy by an organic material
Implementation Method 2
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 an 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.