Curable Organic Electronic Material for Stable Low-Voltage Operation
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Solution Overview
Problem
High molecular weight-type organic EL elements face challenges in achieving multi-layered structures and improving luminescent efficiency and lifetime due to solubility issues and instability of materials used in wet processes, while low molecular weight-type elements require vacuum film formation and have limited productivity and high driving voltages.
Innovation Solution
An organic electronic material comprising an ionic compound with specific structures and a charge transporting unit, including polymerizable substituents, is used to form a curable ink composition that enables stable, low-voltage operation and long-term performance by forming insoluble layers through polymerization, suitable for high molecular weight-type elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high molecular weight materials are used for organic EL elements to enable wet process film formation, then ease of manufacture and productivity are improved, but solubility issues cause lower layers to dissolve when upper layers are applied, preventing multi-layered structure formation
Solution Approach 1:
The patent changes the molecular weight parameter of the organic material from low to high molecular weight, enabling wet process film formation. Simultaneously, it introduces a crosslinking mechanism that changes the physical state of the material from soluble to insoluble after film formation, resolving the solubility conflict required for multi-layered structure stability.
Solution Approach 2:
The patent applies a preliminary crosslinking treatment to the first organic layer before applying subsequent layers. This preliminary action converts the soluble polymer into an insoluble crosslinked network, preventing dissolution when upper layers are applied through wet processes, thus enabling stable multi-layered structure formation.
2Manufacturing precision
If low molecular weight materials are used for organic EL elements, then vacuum film deposition is enabled with good film quality, but productivity is limited and driving voltages are high
Solution Approach 1:
The patent replaces the mechanical vacuum deposition system with a wet process coating system. Instead of using vacuum equipment to deposit low molecular weight materials, the invention uses solution-based coating methods with high molecular weight polymers, significantly improving productivity while maintaining film quality through the crosslinking stabilization mechanism.
3Reliability
If charge transporting compounds are mixed with electron accepting compounds to improve luminescent efficiency and lifetime, then element performance is improved, but driving voltage increases and requires complex multi-layered structures
Solution Approach 1:
The patent merges the charge transporting compound and electron accepting compound into a single high molecular weight polymer material. This combination eliminates the need for separate layers or complex mixing structures, simplifying the device architecture while maintaining improved luminescent efficiency and lifetime through the integrated molecular design.
4Reliability
If multiple organic layers are formed to improve luminescent efficiency and lifetime, then element performance is improved, but wet process application causes lower layers to dissolve
Solution Approach 1:
The patent applies preliminary crosslinking treatment to each organic layer after deposition but before subsequent layer application. This preliminary action creates an insoluble protective network in the lower layer, preventing dissolution during wet process application of upper layers, thus enabling successful multi-layered structure formation with improved 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
The solution allows for the production of organic electronic elements with improved charge transporting performance, reduced driving voltage, and extended lifetime, enabling efficient and stable operation, particularly for high molecular weight-type organic EL elements, while also addressing solubility and stability issues.
Implementation Method 1
it is considered important to produce a compound composed of radical cations of the charge transporting compound and counter anions, which is produced in the case of mixing the charge transporting compound and the electron accepting compound
Implementation Method 2
the charge transporting compound includes one or more polymerizable substituents
Data Source
Figure 1
AI summary
Provided is an organic electronic material which is excellent in curability at low temperatures in the case as an ink composition, and able to prepare an organic electronic element capable of reducing the driving voltage and of being driven stably for a long time. The organic electronic material is characterized by containing at least an ionic compound represented by the following general formula (1), and a compound including a charge transporting unit. [In the general formula (1), Ar represents an aryl group or a heteroaryl group, Ra to Rb each independently represent a hydrogen atom (H), an alkyl group, a benzyl group, an aryl group, or a heteroaryl group, and Ar, Ra and Rb may be linked to each other to form a ring. However, at least one of Ra to Rb is any of a hydrogen atom, an alkyl group, and a benzyl group. A represents an anion.]