Organic Electric Element Emission-Auxiliary Layer for Charge Balance
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Solution Overview
Problem
Existing organic electroluminescent elements face challenges in achieving high efficiency and long lifespan due to charge imbalance at the interface of the hole transport layer, leading to reduced color purity and shortened lifetime.
Innovation Solution
Incorporation of a compound with a high T1 value and optimized HOMO level as an emission-auxiliary layer between the hole transport layer and the light emitting layer to balance charges and improve the organic electric element's efficiency and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the hole transport layer material with low HOMO value is used, then the charge injection efficiency is improved, but the exciton transfer to hole transport layer occurs causing charge unbalance and reduced element lifetime
Solution Approach 1:
The patent introduces an emission-auxiliary layer as an intermediary component between the hole transport layer and light emitting layer. This intermediate layer has specifically optimized energy levels (HOMO value and T1 value) that act as a buffer to prevent direct exciton transfer from the light emitting layer to the hole transport layer, thereby maintaining charge balance while preserving efficient charge injection.
Solution Approach 2:
The patent optimizes specific parameters of the emission-auxiliary layer material, particularly the HOMO value and T1 value, to achieve the desired balance. By carefully selecting materials with specific energy level parameters, the invention prevents exciton transfer while maintaining charge injection efficiency, thus resolving the contradiction between productivity and reliability.
2Productivity
If efficiency is increased by optimizing organic material layer, then driving voltage is lowered and life span increases, but charge unbalance at interface reduces luminous efficiency
Solution Approach 1:
The emission-auxiliary layer serves as a mediator that prevents harmful exciton transfer to the hole transport layer while maintaining efficient charge recombination in the light emitting layer. This intermediary structure preserves high luminous efficiency by keeping excitons confined to the light emitting layer, thereby preventing charge unbalance that would otherwise reduce element lifetime.
Solution Approach 2:
The patent applies local quality optimization by designing the emission-auxiliary layer with specific local properties (HOMO and T1 values) that differ from both the hole transport layer and light emitting layer. This localized optimization at the interface region prevents exciton transfer without affecting the overall efficiency of the light emitting layer.
3Reliability
If emission-auxiliary layer is added between hole transport layer and light emitting layer, then charge balance is improved, but device structure becomes more complex
Solution Approach 1:
The emission-auxiliary layer performs multiple functions simultaneously: it prevents exciton transfer to the hole transport layer, maintains charge balance, and preserves efficient charge injection. By consolidating these multiple functions into a single layer with optimized properties, the invention achieves improved charge balance without proportionally increasing device complexity.
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 compound lowers the driving voltage and significantly enhances the luminous efficiency and lifetime of the organic electric element by optimizing energy levels and material properties across the organic material layers.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Implementation Method 2
long life span and high efficiency can be simultaneously achieved when energy levels and T1 values among the respective layers included in the organic material layer, inherent material properties (mobility, interfacial properties, etc.) and the like are optimal combination
Data Source
AI summary
Provided are a compound represented by Formula 1, an organic electric element comprising a first electrode, a second electrode, and an organic material layer formed between the first electrode and the second electrode, and an electronic device thereof, wherein by comprising compound represented by Formula 1 in the organic material layer, the driving voltage of the organic electric element can be lowered, and the luminous efficiency and life time, in particular, life time can be improved.