OLED Auxiliary Layer Compound for Charge Balance and Longer Lifespan
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Solution Overview
Problem
Existing organic electroluminescent devices face challenges with efficiency, lifespan, and driving voltage, particularly due to charge imbalance and material instability in the hole transport layer, which affects color purity and lifespan.
Innovation Solution
A novel compound represented by Formula (1-10) is introduced, which can be used in the emitting-auxiliary layer to improve luminous efficiency, stability, and lifespan by optimizing energy levels and T1 values, and is suitable for use in hole injection, transport, and transport auxiliary layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the efficiency is increased, then the driving voltage is relatively decreased, but the lifespan tends to increase only if crystallization due to Joule heating is reduced
Solution Approach 1:
The patent changes the energy level parameters of the organic materials in each layer, specifically optimizing the HOMO and LUMO levels to achieve better energy alignment. This parameter optimization allows for improved efficiency while controlling the driving voltage and reducing Joule heating effects that would otherwise shorten lifespan.
Solution Approach 2:
The patent employs a multi-layered composite structure with different organic materials, each carefully selected for its specific energy level characteristics. The composite structure includes hole injection layer, hole transport layer, emitting layer, electron transport layer, and electron injection layer, where each layer's material properties are optimized to work together, achieving both high efficiency and long lifespan.
2Reliability
If the HOMO value of hole transport layer material is lowered, then charge transport is improved, but the T1 value decreases causing exciton transfer to hole transport layer and charge unbalance
Solution Approach 1:
The patent simultaneously optimizes both HOMO and T1 energy parameters of the hole transport layer material. By carefully selecting materials with specific HOMO values that are low enough for good charge transport but paired with sufficiently high T1 values to prevent exciton transfer, the patent resolves the contradiction between charge transport and efficiency.
Solution Approach 2:
The patent applies different energy level characteristics to different layers. The hole transport layer is specifically designed with localized energy level properties (HOMO and T1 values) that are optimized for its function, while other layers have different optimized parameters, creating a system where each local region contributes its specific quality to the overall performance.
3Stability of the object's composition
If the glass transition temperature of hole injection layer material is increased, then stability against Joule heating is improved, but penetration of metal oxide from anode electrode is delayed only if heat resistance is sufficient
Solution Approach 1:
The patent changes the glass transition temperature parameter of the hole injection layer material to a higher value, which provides better thermal stability against Joule heating during device operation. This parameter change ensures the material maintains its structural integrity and prevents metal oxide penetration from the anode electrode, thereby extending device lifespan.
Solution Approach 2:
The patent prepares the hole injection layer with high glass transition temperature material in advance to cushion against the thermal stress that will occur during device operation. This preemptive measure prevents degradation and metal oxide penetration before they can occur, protecting the device structure and extending its operational life.
Data Source
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AI summary
Provided are a compound of Formula (1-10) capable of improving the light-emitting efficiency, stability, and lifespan of an organic electronic element, a composition comprising the same, an organic electronic element using the same, and an electronic device thereof.