Atropisomeric Compounds for OLED Efficiency and Lifetime
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Solution Overview
Problem
Organic electronic devices, such as OLEDs, face issues with short operating lifetime, unreproducible production due to isomeric mixtures with different physical properties, and solubility challenges in common solvents, limiting their efficiency and longevity.
Innovation Solution
The use of atropisomeric compounds with an excess of at least 10% diastereomers, which are capable of forming diastereomers, to enhance the efficiency and longevity of organic electronic devices by ensuring uniform production and operation, and improving solubility for easier purification and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mixtures of isomeric compounds are used in organic electronic devices, then a variety of physical properties can be achieved, but uniform and reproducible production becomes impossible due to different sublimation temperatures and physical properties of the isomers
Solution Approach 1:
The patent extracts and isolates individual atropisomers from mixtures of isomeric compounds. By separating the isomers and selecting those with specific properties, the invention eliminates the variability caused by isomeric mixtures while maintaining the desired physical properties for organic electronic device performance.
Solution Approach 2:
The patent changes the stereochemical parameter by selecting compounds with specific atropisomeric configurations. This parameter change ensures that only isomers with consistent sublimation temperatures and physical properties are used, thereby achieving reproducible production while maintaining versatility in device performance.
2Reliability
If compounds with hindered rotation are used to achieve atropisomerism, then stereoisomer separation becomes possible, but the compounds become difficult to purify and process due to poor solubility in common solvents
Solution Approach 1:
The patent introduces chiral auxiliaries or resolving agents as intermediaries during the synthesis and purification process. These intermediaries enable the separation of atropisomers by forming diastereomeric complexes that have different solubility properties, thereby facilitating purification while maintaining the stability of the hindered rotation structures.
3Adaptability or versatility
If isomeric mixtures are used in organic electronic devices, then various physical properties can be obtained, but different proportions of isomers are enriched during sublimation leading to unreproducible results
Solution Approach 1:
The patent performs preliminary separation and selection of specific atropisomers before device fabrication. By pre-establishing the correct isomeric composition through selective synthesis or separation techniques, the invention prevents subsequent isomerization and enrichment during sublimation, ensuring stable and reproducible device performance.
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
This approach results in increased efficiency, longer device lifetime, and more reproducible production of organic electronic devices by utilizing compounds with a high atropisomeric excess, leading to more stable and uniform layers with improved solubility and reduced isomerization during sublimation.
Implementation Method 1
Since these isomers in some cases also sublime at different temperatures, uniform, reproducible production of the organic electronic devices, in particular, is thus also impossible since different proportions of the isomers are enriched depending on the progress of the sublimation.
Implementation Method 2
the compounds are always depicted as planar molecules without discussing the spatial structure. The mixtures of the isomers were apparently always used for the production of the electronic devices.
Implementation Method 3
Many of the compounds mentioned in these descriptions exhibit atropisomerism, i.e. stereoisomerism which occurs due to hindered rotation about a single bond
Data Source
AI summary
The present invention relates to the improvement of organic electronic devices, in particular electroluminescent devices, by using compounds which can have a plurality of isomers, where one of these isomers is present in excess.