Organic Light Emitting Element Hole Injection Layer Design
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Solution Overview
Problem
Organic light emitting elements face challenges with low luminous efficiency and high driving voltage due to the low miscibility of organic electron acceptor compounds with hole transporting compounds, leading to inefficient charge injection and transfer characteristics.
Innovation Solution
Incorporating specific organic electron acceptor compounds with strong electron withdrawing groups into the hole injection layer to facilitate efficient hole generation, injection, and transfer, while using specific compounds in the organic material layer to enhance charge injection and movement characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic electron acceptor compounds with strong electron withdrawing groups are used to improve hole generation and injection efficiency, then luminous efficiency is improved, but miscibility with hole transporting compounds deteriorates, leading to high driving voltage and low efficiency
Solution Approach 1:
The patent introduces a specific molecular structure with both electron-withdrawing groups (for hole generation) and electron-donating groups (for miscibility) localized within the same molecule. The hole transport layer comprises compounds having a specific molecular structure that includes both electron-withdrawing groups (such as cyano groups) and electron-donating groups (such as amino groups), allowing the material to simultaneously achieve efficient hole generation and good miscibility with hole transporting compounds, thereby resolving the contradiction between luminous efficiency and charge transfer characteristics
Solution Approach 2:
The patent creates a composite molecular structure that combines functionalities from different material classes. The hole transport layer uses compounds that integrate the electron-accepting properties of organic electron acceptor compounds with the electron-donating and miscibility properties of hole transporting compounds, forming a hybrid material system that achieves both efficient hole generation and good compatibility, thus resolving the miscibility issue while maintaining high luminous efficiency
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 proposed solution results in organic light emitting elements with improved efficiency, extended lifespan, and reduced driving voltage, addressing the inefficiencies and limitations of existing technologies.
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
An organic light emitting element and a display device, specifically, an organic light emitting element including a first compound represented by chemical formula 1 and a second compound represented by chemical formula 2 provides excellent efficiency, long lifespan or low driving voltage and a display device including the organic light emitting element.