Organic Electric Element Compound for Charge Balance and Efficiency
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Solution Overview
Problem
Current organic electric elements face challenges with efficiency, lifespan, and color purity due to charge imbalance and material limitations, particularly in the hole transport layer, and require materials resistant to Joule heating and deposition methods.
Innovation Solution
A compound with a five-membered hetero ring is developed to improve luminous efficiency, reduce driving voltage, and enhance color purity and lifespan by optimizing energy levels and material properties in the organic material layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hole transport layer material with low HOMO value is used, then charge transport is improved, but T1 value becomes low causing exciton transfer to hole transport layer, resulting in charge unbalance and reduced lifespan
Solution Approach 1:
An emission-auxiliary layer is introduced as an intermediary between the hole transport layer and light emitting layer. This layer has a HOMO energy level positioned between the HOMO levels of the hole transport layer and light emitting layer, acting as a mediator to prevent direct exciton transfer from the light emitting layer to the hole transport layer, thereby maintaining charge balance while allowing efficient charge transport.
Solution Approach 2:
The invention changes the energy level parameters by selecting materials with specific HOMO values for the emission-auxiliary layer. The HOMO energy level of the emission-auxiliary layer is controlled to be higher than that of the hole transport layer but lower than that of the light emitting layer, creating an energy barrier that prevents exciton transfer while maintaining charge transport efficiency.
2Productivity
If efficiency is increased, then driving voltage is lowered, but Joule heating increases causing crystallization of organic material and reduced lifespan
Solution Approach 1:
The emission-auxiliary layer serves as a thermal buffer between the light emitting layer and hole transport layer, preventing direct heat transfer that would cause crystallization. This intermediary layer allows the system to operate at higher efficiencies with lower driving voltages while protecting the organic materials from thermal damage.
Solution Approach 2:
The invention optimizes the energy level parameters of the emission-auxiliary layer to achieve a balance between efficiency and thermal management. By carefully selecting materials with appropriate HOMO values, the system achieves high luminous efficiency while the emission-auxiliary layer prevents excessive Joule heating from causing material crystallization.
3Reliability
If emission-auxiliary layer is added to solve charge imbalance, then charge transport is improved, but device structure becomes more complex
Solution Approach 1:
The emission-auxiliary layer is designed to perform multiple functions simultaneously: it prevents exciton transfer from the light emitting layer to the hole transport layer, maintains charge balance, and provides thermal management. This multi-functionality justifies the additional layer by delivering multiple benefits from a single structural addition.
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 significantly improves the organic electric element's efficiency, lifespan, and color purity while reducing driving voltage, addressing material limitations and Joule heating issues.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by means of an organic material
Implementation Method 2
A material used as an organic material layer in an organic electric element may be classified into a light emitting material and a charge transport material
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
Provided are a compound of Formula 1 and an organic electric element including a first electrode, a second electrode, and an organic material layer between the first and the second electrodes, where the organic material layer contains the compound of Formula 1 and improves luminous efficiency, stability, and life span of the element.