Organic Compound for OLED Hole Transport and Electron Blocking
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Solution Overview
Problem
Existing organic electric elements face challenges in achieving high efficiency, long lifespan, and optimal energy levels due to limitations in the materials used for the organic material layer, particularly in the hole transport layer and emission-auxiliary layers.
Innovation Solution
A compound with dibenzofuran fused with an aromatic ring and bonded to tertiary amine is developed, which enhances electron blocking and hole transport abilities, improves luminous efficiency, lowers driving voltage, and increases thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hole transport layer with low HOMO value is used, then hole transport ability is improved, but exciton transfer to the hole transport layer occurs causing charge unbalance and light emission at the interface
Solution Approach 1:
An emission-auxiliary layer is introduced as an intermediary between the hole transport layer and the light emitting layer. This auxiliary layer has a HOMO energy level positioned between the hole transport layer and light emitting layer, acting as an energy bridge that prevents direct exciton transfer to the hole transport layer while maintaining efficient charge transport. The auxiliary layer mediates the energy level mismatch and eliminates the harmful interface emission.
Solution Approach 2:
The HOMO energy level parameter of the emission-auxiliary layer is specifically optimized to be higher than the hole transport layer but lower than the light emitting layer. By adjusting this energy level parameter, the system achieves both efficient hole transport from the hole transport layer and prevents exciton migration to it, simultaneously improving productivity and reliability.
2Productivity
If efficiency is increased by improving the organic material layer, then driving voltage is lowered and life span increases, but optimal combination of energy levels and material properties among respective layers is difficult to achieve
Solution Approach 1:
The emission-auxiliary layer is designed to perform multiple functions simultaneously: it acts as an energy barrier to prevent exciton transfer to the hole transport layer, serves as a charge transport pathway, and functions as an emission layer itself. This multi-functionality simplifies the overall device structure and optimization process while maintaining high efficiency and long lifespan.
Solution Approach 2:
The emission-auxiliary layer utilizes composite material design combining specific organic compounds with optimized molecular structures. The material incorporates rigid aromatic hydrocarbon frameworks with appropriate substituents to achieve the desired energy levels, mobility, and interfacial properties, creating a composite solution that balances multiple requirements.
3Device complexity
If conventional hole transport layer materials are used, then device structure is simple, but metal oxide penetration from anode into organic layer occurs causing shortened life span
Solution Approach 1:
The emission-auxiliary layer serves as a protective intermediary between the anode and the hole transport layer. It creates an energy barrier that prevents metal oxide ions from penetrating into the organic layers, thereby protecting the device structure while maintaining simplicity. This auxiliary layer acts as a shield against degradation.
4Ease of manufacture
If hole transport layer material with low glass transition temperature is used, then ease of deposition is improved, but uniformity of thin film surface collapses during operation reducing life span
Solution Approach 1:
The glass transition temperature parameter of the emission-auxiliary layer material is optimized to be sufficiently high to maintain thin film uniformity during operation, while the material is still compatible with conventional deposition processes. This parameter adjustment ensures both manufacturability and long-term stability without film collapse.
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 in organic electric elements results in improved luminous efficiency, extended lifespan, reduced driving voltage, and enhanced color purity, thereby addressing the limitations of existing materials.
Implementation Method 1
the compound according to claim 1 has efficient electron blocking ability and hole transport ability
Implementation Method 2
the compound according to claim 1 has efficient electron blocking ability and hole transport ability
Implementation Method 3
Joule heating generated during operation is reduced as driving voltage is lowered
Implementation Method 4
the crystallization of an organic material due to Joule heating generated during operation is reduced as driving voltage is lowered
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
Data Source
Figure 1
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.