OLED Ink Composition for Uniform Large-Area Thin Films
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Solution Overview
Problem
Existing organic light-emitting device manufacturing methods face material loss and difficulty in producing large-area devices due to the deposition process, necessitating the development of a solution-based process.
Innovation Solution
An ink composition comprising a specific compound and solvent, which forms a stable organic material layer with uniform thickness and resistance to solvents, enabling large-area device production and improved performance.
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 structure can be formed, but material loss occurs frequently and it is difficult to manufacture large-area devices
Solution Approach 1:
The patent employs a solution process using ink composition that can be applied through printing or coating methods (hydraulic application), replacing the traditional deposition process. This allows the organic material layer to be formed by applying a liquid solution containing the organic compound and solvent, which is then dried to form the desired layer, significantly reducing material loss and enabling large-area manufacturing.
2Area of stationary object
If a deposition process is used to manufacture organic light emitting devices, then the device structure can be formed, but it is difficult to manufacture large-area devices
Solution Approach 1:
The solution process using ink composition enables the application of organic materials over large areas through printing or coating techniques. The liquid solution can be uniformly distributed across large surfaces, and the subsequent drying process forms the organic material layer efficiently, making large-area device manufacturing feasible and cost-effective.
3Loss of substance
If a solution process is used instead of deposition process, then material loss is reduced and large-area manufacturing is enabled, but the ink composition must form stable thin films with uniform thickness
Solution Approach 1:
The patent carefully controls the parameters of the ink composition, including the molecular structure of the organic compound (with specific functional groups like carboxylic acid or hydroxyl), the type and ratio of solvents (first solvent with specific boiling point range, second solvent), and additives. These parameter optimizations ensure uniform distribution, stable film formation, and consistent thickness across the substrate, achieving manufacturing precision while using the efficient solution process.
4Area of stationary object
If a solution process is used instead of deposition process, then large-area manufacturing is enabled, but the formed thin film must resist solvents to maintain stability
Solution Approach 1:
The patent employs a composite ink composition system consisting of the organic compound with specific functional groups, multiple solvents (first solvent and second solvent with different properties), and potentially additives. This composite formulation ensures that the resulting thin film has both the desired large-area coverage and the chemical stability to resist solvent attack, as the functional groups and solvent system work synergistically to create a robust, stable film structure.
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 facilitates uniform coating, stable thin film formation, and enhances device efficiency and longevity by reducing thickness deviations and allowing for large-area manufacturing.
Implementation Method 1
an ink composition including a compound represented by the following Chemical Formula 1 and a first solvent represented by the following Chemical Formula A
Implementation Method 2
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 thickness between pixels is uniformly coated
Data Source
AI summary
Provided are to 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 described herein.