Organic Light Emitting Element Hole Injection Layer Design
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Solution Overview
Problem
Organic light emitting elements face challenges with low efficiency, short lifespan, and high driving voltage due to inefficient charge injection and transfer characteristics, primarily attributed to the low miscibility of organic electron acceptor compounds with hole transporting compounds.
Innovation Solution
Incorporating a compound with strong electron withdrawing groups in the hole injection layer to enhance hole generation, injection, and transfer, and using a specific organic material layer structure that includes a hole injection layer and a charge generation layer to improve the efficiency and stability of the organic light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic electron acceptor compounds are used in the hole injection layer to enhance hole generation and injection, then hole injection efficiency is improved, but miscibility with hole transporting compounds deteriorates, leading to high driving voltage and low luminous efficiency
Solution Approach 1:
The patent introduces a hole transporting compound as an intermediary layer between the electron acceptor compound and the hole injection layer. This intermediary facilitates efficient hole transport while maintaining good miscibility with both the electron acceptor compound and the hole injection layer, thereby resolving the contradiction between hole injection efficiency and miscibility/charge transfer characteristics
Solution Approach 2:
The patent employs a composite material structure consisting of multiple layers with different functional materials: electron acceptor compounds, hole transporting compounds, and hole injection layers. Each layer is specifically designed to work synergistically with adjacent layers, achieving both efficient hole injection and stable charge transfer characteristics through material composition optimization
2Productivity
If the efficiency of the organic light emitting element is increased, then the driving voltage is decreased, but the crystallization of organic material by Joule heating increases, reducing lifespan
Solution Approach 1:
The patent optimizes multiple parameters including the energy levels of HOMO and LUMO, miscibility ratios, and charge injection barriers to achieve efficient emission while controlling Joule heating. By carefully adjusting these parameters, the system achieves high emission efficiency without excessive temperature rise that would cause crystallization and reduce device lifespan
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 solution results in an organic light emitting element with high emission efficiency, long lifespan, and low driving voltage by optimizing hole injection and charge transfer characteristics.
Implementation Method 1
it may withdraw electrons from a high occupied molecular orbital (HOMO) energy level of the adjacent hole transport layer to a low occupied molecular orbital (LUMO) energy level of the organic electron acceptor compound to generate holes and inject the holes into the hole transport layer
Implementation Method 2
In general, organic light emission refers to a phenomenon in which electric energy is converted into light energy by an organic material
Data Source
AI summary
Embodiments of the disclosure relate to an organic light emitting element and a display device. Specifically, there may be provided an organic light emitting element including a compound represented by chemical formula 1 to provide excellent efficiency, long lifespan or low driving voltage and a display device including the organic light emitting element.