Organic Light Emitting Element Hole Injection Layer Design
Find Innovative SolutionsGenerate Solutions
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 enhance hole generation, injection, and transfer, and using specific compounds in the organic material layer to improve charge injection and transfer 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, then luminous efficiency is improved, but miscibility with hole transporting compounds deteriorates leading to high driving voltage
Solution Approach 1:
The patent introduces a specific structural motif (indacene core with electron withdrawing groups at positions 2 and 6) to create local electronic properties that favor hole generation while maintaining overall molecular compatibility. This localized functional group arrangement allows the compound to exhibit strong electron withdrawing character for efficient hole injection without compromising miscibility with hole transporting materials.
Solution Approach 2:
The patent designs composite molecular structures combining indacene cores with specific electron withdrawing groups (cyano, carbonyl, or ester groups) at particular positions. This composite approach creates molecules that integrate the beneficial electronic properties of electron withdrawing groups with the structural compatibility of indacene framework, achieving both high luminous efficiency and acceptable driving voltage.
2Productivity
If organic electron acceptor compounds are doped into hole injection layer to enhance charge injection, then hole generation efficiency is improved, but charge transfer characteristics deteriorate due to low miscibility
Solution Approach 1:
The patent systematically varies molecular parameters including the position of electron withdrawing groups on the indacene ring system, the type of substituent (cyano, carbonyl, ester), and their concentration in the hole injection layer. By optimizing these parameters, the patent achieves efficient hole generation while maintaining good charge transfer characteristics through improved miscibility with hole transporting compounds.
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 organic light emitting elements with high emission efficiency, long lifespan, and low driving voltage by optimizing hole injection and electron injection 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 present disclosure relate to an organic light emitting element and a display device. Specifically, there may be provided an organic light emitting element including a first compound represented by chemical formula 1 and a second compound represented by chemical formula 2 to provide excellent efficiency, long lifespan or low driving voltage and a display device including the organic light emitting element.