Curable Ink Composition for Uniform Large-Area OLED Films
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Solution Overview
Problem
Existing organic light emitting devices face challenges in manufacturing large-area devices due to material loss during deposition processes and difficulty in achieving uniform thickness and stability of organic material layers.
Innovation Solution
An ink composition comprising a specific compound and solvent, which includes a curable group and heterocyclic groups, is used to form an organic material layer through a solution process, enabling uniform coating and stable thin film formation with improved interfacial characteristics and hole injection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a deposition process is used to manufacture organic light emitting devices, then the device can be manufactured with existing processes, but material loss occurs frequently and it is difficult to manufacture large-area devices
Solution Approach 1:
The patent employs a solution processing method where organic material is dissolved in a solvent to form an ink composition, which is then deposited onto the substrate. This liquid-phase deposition approach replaces traditional vacuum deposition, eliminating material loss while enabling large-area manufacturing through techniques like spin-coating, inkjet printing, or dip-coating.
Solution Approach 2:
The patent changes the physical state of the organic material from solid (used in deposition) to dissolved state in solution. By formulating the ink composition with specific solvents and concentrations, the material can be uniformly distributed and deposited without loss, then the solvent evaporates to leave the functional organic layer.
2Ease of manufacture
If a deposition process is used to manufacture organic light emitting devices, then the device can be manufactured with existing processes, but it is difficult to manufacture devices having large area
Solution Approach 1:
The solution processing method using liquid ink composition enables coverage of large substrate areas through various liquid deposition techniques. The fluid nature of the ink allows uniform coating over large surfaces that would be difficult to achieve with conventional vacuum deposition methods.
Solution Approach 2:
The ink composition can be applied through multiple deposition techniques (spin-coating, inkjet printing, dip-coating, spray coating), making the manufacturing process versatile and adaptable to different substrate sizes and shapes, thereby enabling both small and large-area device fabrication.
3Manufacturing precision
If organic material layer is formed to achieve uniform thickness, then the light-emitting efficiency is improved, but the manufacturing process becomes more complex
Solution Approach 1:
By adjusting parameters such as solvent type, ink concentration, and deposition conditions, the patent achieves uniform thickness control in the organic material layer. The solution processing method inherently provides better thickness uniformity compared to deposition, as the liquid can level out during coating and drying processes.
Solution Approach 2:
The ink composition formulation and deposition process are designed to self-level and form uniform films through controlled evaporation and drying. The solvent naturally distributes the organic material evenly, and the drying process automatically produces uniform thickness without requiring complex multi-step manufacturing procedures.
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 ink composition allows for uniform thickness and stable thin film formation, facilitating high light-emitting efficiency and long service life of organic light emitting devices, while enabling large-area manufacturing without material loss.
Implementation Method 1
X1 and X2 are the same as or different from each other, and are each independently a curable group
Implementation Method 2
a device using a solution process has been developed
Implementation Method 3
When a number of pixels are coated with the ink composition according to an exemplary embodiment of the present invention, there is an effect in which the pixels are uniformly coated to a uniform thickness between pixels
Data Source
AI summary
Provided are an ink composition comprising a compound represented by Chemical Formula 1 and a first solvent represented by Chemical Formula A, an organic material layer including the same and an organic light emitting device including the same,wherein all the variables are descried herein.