Organic Semiconductor Ink Formulation for Uniform Layer Deposition
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Solution Overview
Problem
Existing formulations for organic semiconductor inkjet printing face challenges in achieving homogeneous deposition and uniform layer formation due to the complexity of solvent parameters such as surface tension, viscosity, and boiling point, which affects the performance and properties of the deposited layers.
Innovation Solution
A formulation comprising a mixture of three different organic solvents with specific boiling point and viscosity ranges, where the first solvent has a boiling point between 250-350°C and viscosity of 10 mPas, the second solvent has a boiling point between 200-350°C and viscosity between 2-5 mPas, and the third solvent has a boiling point between 100-300°C and viscosity of 3 mPas, ensuring effective solubility and controlled deposition of organic functional materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single organic solvent is used for inkjet printing of organic semiconductors, then the formulation is simple, but homogeneous deposition and uniform layer formation cannot be achieved
Solution Approach 1:
The invention divides the solvent system into three distinct components with specific boiling point ranges (first solvent: 200-350°C, second solvent: 150-300°C, third solvent: 80-200°C) and specific viscosity ranges (1-10 mPas, 1-5 mPas, and 1-3 mPas respectively). This segmentation allows each solvent to contribute different properties to the formulation, enabling precise control over deposition behavior and layer uniformity while maintaining a structured approach to formulation complexity.
Solution Approach 2:
The invention systematically controls multiple parameters including boiling points, viscosities, and solubilities of the three solvents to achieve optimal deposition. By adjusting these parameters within specific ranges and maintaining a minimum boiling point difference of 10°C between consecutive solvents, the formulation achieves homogeneous deposition and uniform layer formation without excessive complexity.
2Manufacturing precision
If solvents with different boiling points are used to control deposition, then layer uniformity is improved, but the number of parameters to control increases
Solution Approach 1:
The solvent system is segmented into three components with clearly defined boiling point ranges and viscosity ranges. This segmentation transforms the complex parameter control into a structured system where each solvent component has specific property windows, making the formulation more manageable while achieving precise deposition control.
Solution Approach 2:
The invention establishes specific parameter ranges for each solvent (boiling points: 200-350°C, 150-300°C, 80-200°C; viscosities: 1-10 mPas, 1-5 mPas, 1-3 mPas) and maintains a minimum boiling point difference of 10°C between consecutive solvents. This systematic parameter control enables precise deposition while reducing the complexity of formulation development.
3Manufacturing precision
If viscosity is increased to improve layer properties, then film uniformity improves, but inkjet printing capability deteriorates
Solution Approach 1:
The viscosity control is segmented across three solvent components, each with specific viscosity ranges (1-10 mPas, 1-5 mPas, 1-3 mPas). This segmentation allows the formulation to achieve optimal film uniformity while maintaining inkjet printability, as the combined viscosity of the multi-component system can be tuned independently of other critical properties like boiling point and solubility.
Solution Approach 2:
By controlling the viscosity of each solvent component within specific ranges and adjusting their proportions in the formulation, the invention achieves an optimal balance between film uniformity and inkjet printability. The multi-parameter control system allows independent optimization of viscosity for printability while other parameters contribute to film quality.
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 formulation enables uniform and well-defined organic layers with good layer properties and performance, facilitating efficient ink deposition and film uniformity during inkjet printing.
Implementation Method 1
a formulation containing at least one organic functional material and a mixture of three different organic solvents
Implementation Method 2
controlled deposition to form organic semiconductor layers having good layer properties and efficient performance
Data Source
AI summary
The present invention relates to a formulation containing at least one organic functional material and a mixture of three different organic solvents, a first organic solvent A, a second organic solvent B and a third organic solvent C, characterized in that the first organic solvent A has a boiling point in the range from 250 to 350° C. and a viscosity of ≥10 mPas, the second organic solvent B has a boiling point in the range from 200 to 350° C. and a viscosity in the range from 2 to 5 mPas and the third organic solvent C has a boiling point in the range from 100 to 300° C. and a viscosity of ≤3 mPas, the solubility of the at least one organic functional material in the second organic solvent B is ≥5 g/l, and the boiling point of the first organic solvent A is at least 10° C. higher than the boiling point of the second organic solvent B, to the use of this formulation for the preparation of electronic devices as well as to electronic devices prepared by using these formulations.