Organic Light Emitting Compound for Charge Balance and Efficiency
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Solution Overview
Problem
Existing organic electric elements face challenges in achieving high efficiency, long lifespan, and balanced charge transport while maintaining low driving voltage and high heat resistance, particularly due to issues with the hole transport layer and the accumulation of positive polarons at the interface between the light emitting layer and the hole transport layer.
Innovation Solution
A specific compound with a core structure of dibenzofuran or dibenzothiophene bonded to two amine groups via a linking group is used. This compound has a limited type of amine group and specific bonding positions and numbers, which helps in balancing the charge in the light emitting layer by optimizing the HOMO energy level and T1 value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a material having high hole mobility is used to lower driving voltage, then driving voltage is reduced, but positive polaron accumulates at the interface between light emitting layer and hole transporting layer, causing interface deterioration and reducing lifetime and efficiency
Solution Approach 1:
The patent introduces an emission-auxiliary layer as an intermediary between the hole transport layer and the light emitting layer. This auxiliary layer acts as a mediator that prevents direct harmful interactions at the interface while still allowing charge transport. The auxiliary layer material is specifically designed with HOMO value between the light emitting layer and hole transport layer to prevent positive polaron accumulation, thus resolving the contradiction between low driving voltage and interface stability.
Solution Approach 2:
The patent changes the energy level parameters (HOMO value) of the emission-auxiliary layer material to optimize charge distribution. By selecting materials with specific HOMO values that fall between the light emitting layer and hole transport layer, the patent creates optimal energy alignment that prevents polaron accumulation while maintaining efficient charge transport, thereby resolving the contradiction between power consumption and interface reliability.
2Productivity
If efficiency is increased, then driving voltage is lowered and life span increases, but this requires optimal combination of energy levels and T1 values among respective layers which is difficult to achieve
Solution Approach 1:
The emission-auxiliary layer material is designed to perform multiple functions simultaneously: it acts as a hole transport medium, provides energy level matching between layers, prevents polaron accumulation, and maintains interface stability. By creating a multi-functional layer, the patent simplifies the overall system design while achieving high efficiency and long lifetime without requiring complex optimization of multiple separate materials.
3Reliability
If different emission-auxiliary layers are developed according to respective light emitting layers, then charge balance is improved, but device complexity and development time increase
Solution Approach 1:
The patent achieves charge balance optimization by adjusting the HOMO value parameter of the emission-auxiliary layer material rather than developing entirely different materials for different light emitting layers. This parameter-based optimization approach maintains the same basic material structure while achieving different performance characteristics through molecular design variations, thereby reducing device complexity while improving charge balance.
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 this compound leads to improved luminous efficiency, reduced driving voltage, enhanced heat resistance, increased color purity, and extended lifetime of the organic electric elements.
Implementation Method 1
a hole transport layer, and an emission-auxiliary layer formed between the hole transport layer and the light emitting layer
Implementation Method 2
provide a compound having efficient electron blocking ability and hole transport ability
Implementation Method 3
an organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Implementation Method 4
improved luminous efficiency, reduced driving voltage, enhanced heat resistance
Data Source
AI summary
Provided are a compound represented by Formula 1, and 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, wherein the organic material layer comprised the compound represented by Formula 1, and the driving voltage of an organic electronic device can be lowered, and the luminous efficiency, color purity and life time of an organic electronic device can be improved by comprising the compound represented by Formula 1 in the organic material layer.