Organic Electronic Element Using Formula 1 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 and emission-auxiliary layers, which affect color purity and overall performance.
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, inherent material properties, and interfacial properties to form improved hole transport and emission-auxiliary layers, enhancing charge balance and reducing exciton transport to the hole transport layer.
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 reduced color purity and efficiency
Solution Approach 1:
An emission auxiliary layer is introduced 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 through the hole transport layer itself.
Solution Approach 2:
The patent optimizes the energy level parameters of the emission auxiliary layer, specifically ensuring high T1 energy value and wide band gap. By changing these material parameters, the layer effectively blocks exciton transport while allowing hole transport, thus resolving the contradiction between hole transport capability and color purity/efficiency.
2Power
If a material with rapid hole mobility is used to reduce driving voltage, then driving voltage is lowered, but charge unbalance occurs in the light emitting layer because hole mobility becomes faster than electron mobility, reducing efficiency and lifespan
Solution Approach 1:
The emission auxiliary layer acts as a mediator that balances charge transport. By positioning this layer with specific energy level characteristics between the hole transport layer and light emitting layer, it modulates the charge flow to achieve better charge balance while maintaining low driving voltage.
Solution Approach 2:
The patent carefully selects materials for the emission auxiliary layer with specific mobility parameters that are lower than or comparable to electron mobility in the light emitting layer. This parameter optimization ensures charge balance is achieved while maintaining efficient operation at low driving voltages.
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 among respective layers, reducing efficiency and lifespan
Solution Approach 1:
The organic material layer is segmented into distinct functional layers: hole injection layer, hole transport layer, emission auxiliary layer, light emitting layer, electron transport layer, and electron injection layer. This segmentation allows each layer to be optimized for its specific function, particularly the emission auxiliary layer which is specifically designed to have high T1 energy value and wide band gap, thereby achieving optimal energy level combination for high efficiency and long lifespan.
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 proposed solution results in organic electric elements with improved luminous efficiency, reduced driving voltage, and extended lifespan, while maintaining color purity and efficiency by optimizing the energy levels and material properties of 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
excitons generated from a light emitting layer are transported to the hole transporting layer, resulting in a charge unbalance in the light emitting layer
Implementation Method 3
the crystallization of an organic material due to Joule heating generated during operation is reduced as driving voltage is lowered
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.