Ink Composition for Organic Functional Layers Using Terpene Solvents
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Solution Overview
Problem
Existing ink compositions for electronic devices with organic functional layers face challenges in achieving homogeneity and device performance due to issues with molecular weight and solvent properties, leading to suboptimal printing and layer formation.
Innovation Solution
A novel ink composition comprising an organic functional material with a molecular weight of at most 5,000 g/mol and a first organic solvent with a boiling point between 200° C. and 320° C., selected from terpenes, terpenoids, or their combinations, which improves homogeneity and device performance by optimizing viscosity and surface tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional ink compositions with higher molecular weight organic functional materials are used, then the ink composition has sufficient stability and solubility, but the homogeneity of the ink layer on the substrate deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the organic functional material from conventional higher values to specifically 5,000 g/mol or less. This parameter change resolves the contradiction by enabling both sufficient stability/solubility and improved homogeneity in the printed ink layer, as the lower molecular weight facilitates better distribution and uniformity while maintaining adequate solubility in the solvent system.
2Productivity
If conventional solvents with lower boiling points are used, then the drying process is faster and more efficient, but the homogeneity and quality of the organic functional layer deteriorates
Solution Approach 1:
The patent changes the boiling point parameter of the solvent to a specific range (200-320°C) that balances drying efficiency with layer quality. This intermediate boiling point range allows for controlled evaporation that maintains homogeneity while achieving reasonable drying speeds, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent employs a composite solvent system comprising terpenes and/or terpenoids in combination with other solvents. This composite approach allows the solvent mixture to exhibit optimized properties where the terpene/terpenoid components contribute to homogeneity and controlled evaporation, while the combined system achieves both acceptable drying efficiency and high layer quality.
3Manufacturing precision
If ink compositions optimized for homogeneity are used, then the ink layer uniformity is improved, but the device performance may be compromised
Solution Approach 1:
The patent identifies and optimizes multiple parameters simultaneously: molecular weight (≤5,000 g/mol), solvent boiling point (200-320°C), and solvent composition (terpenes/terpenoids). This multi-parameter optimization ensures that the ink composition achieves both excellent layer uniformity and high device performance, as the specific parameter ranges are tuned to work together rather than in opposition.
Solution Approach 2:
The patent uses a composite approach combining low molecular weight organic functional materials with a specific class of solvents (terpenes and/or terpenoids). This composite material system achieves synergistic effects where the combination of these components produces both homogeneous ink layers and high-performance devices, resolving the contradiction between uniformity and performance.
4Ease of manufacture
If ink compositions with optimized solvent properties are used, then the suitability for inkjet printing is improved, but the complexity of composition selection and optimization increases
Solution Approach 1:
The patent establishes specific parameter ranges (molecular weight ≤5,000 g/mol, boiling point 200-320°C) that directly translate to inkjet printing suitability. By defining these concrete parameters, the patent simplifies the selection process despite the complexity of composition optimization, as formulators can target these specific ranges to achieve printability without exhaustive experimentation.
Solution Approach 2:
The patent introduces terpenes and/or terpenoids as intermediary solvent components that mediate between the organic functional material and the printing process. These specific solvent classes act as intermediaries that provide the necessary solubility, viscosity, and evaporation characteristics for inkjet printing, simplifying the overall composition design while achieving excellent printability.
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 proposed ink composition ensures better homogeneity and device performance by enhancing ink layer uniformity and solvent properties, making it suitable for inkjet printing and resulting in efficient electronic device fabrication.
Implementation Method 1
drying the solvent
Data Source
AI summary
The present invention relates to an ink composition comprising an organic functional material having a molecular weight of at most 5,000 g/mol and a first organic solvent selected from the group consisting of terpene, terpenoid, and combination of any of these, as well as to the use of the ink composition, an electronic device prepared by using the ink composition and method for preparing/fabricating thereof.