Organic Electronic Element Compound for Charge Balance
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Solution Overview
Problem
Current organic electric elements face challenges in achieving high luminous efficiency, low driving voltage, and extended lifespan due to charge imbalance and material limitations in the hole transport layer and emission-auxiliary layer, which affect color purity and efficiency.
Innovation Solution
The development of organic electric elements using a compound with a specific molecular structure, represented by Formula 1, that optimizes energy levels and T1 values, enhancing mobility and interfacial properties across layers to improve charge balance and reduce driving voltage, thereby improving efficiency and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a material with low HOMO value is used in the hole transport layer, then hole transport capability is improved, but T1 value becomes low causing exciton transport to the hole transport layer, resulting in charge unbalance and reduced color purity
Solution Approach 1:
The patent introduces an emission-auxiliary layer as an intermediary between the hole transport layer and the light emitting layer. This intermediate layer has high T1 energy value and wide band gap, which prevents exciton transport to the hole transport layer while maintaining hole transport capability, thus resolving the charge unbalance issue
Solution Approach 2:
The patent changes the energy level parameters (HOMO, LUMO, T1 value, band gap) of the materials used in different layers. Specifically, the emission-auxiliary layer is designed with high T1 energy value and wide band gap to prevent exciton leakage, while the hole transport layer maintains low HOMO value for efficient hole transport
2Power
If a material with rapid hole mobility is used to reduce driving voltage, then driving voltage is lowered, but efficiency decreases due to charge unbalance in the light emitting layer
Solution Approach 1:
The emission-auxiliary layer acts as a mediator that allows rapid hole transport while preventing exciton loss to the hole transport layer. This enables the use of materials with rapid hole mobility without sacrificing luminous efficiency
Solution Approach 2:
The patent optimizes the energy level parameters of the emission-auxiliary layer (high T1 energy value, wide band gap) to create an energy barrier that prevents exciton transport to the hole transport layer, thereby maintaining charge balance and efficiency while allowing rapid hole transport
3Device complexity
If the organic material layer structure is simplified, then device complexity is reduced, but it becomes difficult to achieve optimal combination of energy levels and T1 values for high efficiency and long lifespan
Solution Approach 1:
The patent segments the organic material layer into multiple functional layers (hole injection layer, hole transport layer, emission-auxiliary layer, light emitting layer, electron transport layer, electron injection layer). Each layer is optimized for its specific function, allowing independent optimization of energy levels and T1 values without increasing overall 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 use of the compound results in organic electric elements with enhanced luminous efficiency, reduced driving voltage, and improved color purity and lifespan, addressing the limitations of existing materials by optimizing energy levels and interfacial properties.
Implementation Method 1
a hole transferred from a hole transport layer to the light emitting layer are recombined to form an exciton
Implementation Method 2
an optimal combination of energy levels and T1 values, inherent material properties (mobility, interfacial properties, etc.)
Implementation Method 3
an electron transferred from an electron transport layer to a light emitting layer and a hole transferred from a hole transport layer to the light emitting layer are recombined to form an exciton
Implementation Method 4
having high T1 energy value and wide band gap
Implementation Method 5
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Implementation Method 6
enhancing mobility and interfacial properties across layers to improve charge balance
Data Source
AI summary
An organic electric element includes a first electrode, a second electrode, and an organic material layer between the first electrode and the second electrode. The organic material layer includes the compound represented by Formula 1. When the organic electric element includes the compound in the organic material layer, luminous efficiency, stability, and life span can be improved.