Organic Emission Auxiliary Layer for Charge Balance and Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electric elements face challenges with high driving voltage, low luminous efficiency, and reduced lifetime due to charge imbalance and thermal instability in the light emitting layer, primarily because of the low T1 value and HOMO value of materials used in the hole transport layer and the imbalance between hole and electron mobility.
Innovation Solution
A compound with a specific molecular structure, represented by the provided formula, is used to form an emission-auxiliary layer that balances charge transport, lowers driving voltage, and enhances luminous efficiency and lifetime by optimizing energy levels and T1 values within the organic material layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hole transport layer materials are used, then device structure is simple, but charge balance is poor and luminous efficiency is low
Solution Approach 1:
The patent divides the hole transport function into two separate layers: a conventional hole transport layer and a newly introduced emission auxiliary layer. This segmentation allows each layer to specialize in specific functions - the hole transport layer handles charge transport while the emission auxiliary layer optimizes exciton management and charge balance, thereby resolving the contradiction between maintaining structural simplicity and improving luminous efficiency.
Solution Approach 2:
The emission auxiliary layer acts as an intermediary between the hole transport layer and the light emitting layer. It mediates the interaction between holes and excitons, preventing harmful interactions while facilitating beneficial ones. This intermediary layer improves charge balance and luminous efficiency without requiring fundamental changes to the overall device structure.
2Reliability
If driving voltage is high, then charge transport is sufficient, but power consumption increases and lifetime decreases
Solution Approach 1:
The patent modifies the energy level parameters of the emission auxiliary layer, specifically setting its HOMO level between -5.0 eV and -6.0 eV and LUMO level between -2.0 eV and -3.0 eV. These parameter changes enable the layer to effectively regulate charge transport and exciton management, allowing the device to achieve better charge balance at lower driving voltages, thus extending lifetime while reducing power consumption.
Solution Approach 2:
The emission auxiliary layer provides a feedback mechanism for charge and exciton management. By carefully designing its energy levels to be intermediate between the hole transport layer and light emitting layer, it creates a self-regulating system where excess charges and excitons are naturally managed, reducing the need for high driving voltages and thereby extending device lifetime.
3Productivity
If T1 value of hole transport layer material is low, then material selection is easy, but charge balance deteriorates and luminous efficiency decreases
Solution Approach 1:
The emission auxiliary layer serves as an intermediary that compensates for the low T1 value of conventional hole transport materials. By positioning this layer between the hole transport layer and light emitting layer with appropriately designed energy levels, it mediates the charge and exciton interactions, preventing the negative effects of low T1 values while maintaining material selection flexibility.
Solution Approach 2:
The patent specifies precise energy level parameters for the emission auxiliary layer (HOMO: -5.0 to -6.0 eV, LUMO: -2.0 to -3.0 eV) that are intermediate between the hole transport layer and light emitting layer. These parameter changes enable effective charge balance and exciton management even when using conventional hole transport materials with low T1 values, thereby improving luminous efficiency without restricting material selection.
4Manufacturing precision
If host/dopant system is used, then color purity and luminous efficiency improve, but wavelength shifts occur due to intermolecular interactions
Solution Approach 1:
The emission auxiliary layer acts as an intermediary buffer between the host/dopant system in the light emitting layer and the hole transport layer. It reduces the impact of intermolecular interactions on the host/dopant system by providing an energy level buffer zone, thereby maintaining color purity while minimizing unwanted wavelength shifts caused by strong intermolecular interactions.
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 improves luminous efficiency, color purity, and lifetime of organic electric elements by reducing driving voltage and achieving better charge balance in the light emitting layer, leading to more stable and efficient organic electric devices.
Implementation Method 1
excitons generated in the light emitting layer are transported to the dopant, thus emitting light with high efficiency
Implementation Method 2
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic 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
The present invention provides the 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 electronic device thereof, and by comprising the compound represented by Formula 1 in the organic material layer, the driving voltage of the organic electronic device can be lowered, and the luminous efficiency and life time of the organic electronic device can be improved.