Branched Organic Electronic Material for Multilayer EL Elements
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Solution Overview
Problem
The challenge in producing organic electroluminescent elements (EL elements) lies in achieving a multilayer structure with high light emission efficiency and extended lifetime, particularly for polymer type organic EL elements, where solvent-based wet processes lead to dissolution issues and high-temperature processing limitations on flexible resin substrates.
Innovation Solution
An organic electronic material with a branched polymer or oligomer structure and polymerizable substituents, along with an ionic compound and charge transporting compound, is used to form a thin film that can be easily processed at low temperatures, enabling a multilayer structure and improved light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a multilayer structure is formed using solvent-based wet processes for polymer type organic EL elements, then film formation can be achieved conveniently, but the lower layer undergoes dissolution when the upper layer is applied
Solution Approach 1:
The patent changes the physical-chemical parameters of the materials by selecting polymers with significantly different solubility characteristics. The lower layer uses a polymer soluble in a specific solvent, while the upper layer uses a polymer insoluble in that same solvent, thereby preventing dissolution while maintaining wet process fabrication advantages
Solution Approach 2:
The patent employs composite material design by combining different polymer types with distinct solubility profiles in the multilayer structure. This allows each layer to be processed with appropriate solvents without affecting the integrity of other layers, resolving the contradiction between ease of manufacture and compositional stability
2Reliability
If high-temperature processing is used to form multilayer structures, then light emission efficiency and lifetime are improved, but flexible resin substrates cannot be used due to temperature limitations
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature to low-temperature regimes by utilizing solvent-based wet processes. This allows flexible resin substrates to be used while still achieving reliable device performance through controlled solvent evaporation and film formation at temperatures compatible with flexible substrates
Solution Approach 2:
The patent substitutes thermal processing mechanisms with solvent-based chemical processes. Instead of relying on high-temperature thermal annealing to achieve proper film formation and interlayer adhesion, the invention uses controlled solvent selection and evaporation to achieve the same objectives at lower temperatures suitable for flexible substrates
3Ease of manufacture
If vapor deposition method is used for low molecular weight type organic EL elements, then multilayer structure can be easily achieved, but the method requires vacuum systems and is not suitable for large-sized elements
Solution Approach 1:
The patent replaces vacuum-based vapor deposition with liquid-phase wet processing methods. By using solvent-based inkjet printing or coating techniques, the invention eliminates the need for vacuum systems while maintaining the ability to form precise multilayer structures, thereby simplifying the manufacturing equipment and enabling large-scale production
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 allows for the formation of organic EL elements with enhanced light emission efficiency and extended lifetime, capable of low-temperature processing on flexible substrates, reducing production costs and improving driving voltage stability.
Implementation Method 1
containing a polymer or oligomer which has a structure branching in three or more directions and has at least one polymerizable substituent
Data Source
AI summary
Provided are: an organic electronic material which can be easily multilayered and that can be used in substrates, such as resin, that cannot be processed at high temperatures; an ink composition containing the same; an organic thin film formed using said organic electronic material or said ink composition; and an organic electronic element and an organic EL element that are formed using said organic thin film and that have a superior luminous efficacy and emission lifespan than conventional elements. Specifically, provided are: an organic electronic material that is characterized by containing an oligomer or a polymer having a structure that branches into three or more directions and has at least one polymerizable substituent; an ink composition containing said organic electronic material; and an organic thin film prepared using the aforementioned organic electronic material. Further, provided are an organic electronic element and an organic electroluminescent element containing said organic thin film.