Inkjet Composition with Dual Boiling Point Fluorinated Alcohols
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Solution Overview
Problem
The inkjet method for forming films in light emitting devices faces issues with dischargeability and clogging due to insufficient solution properties, particularly when using solutions with fluorinated alcohols as solvents.
Innovation Solution
A composition comprising a blend of fluorinated alcohols with specific boiling point ranges and a charge transportable compound, optimized for inkjet dischargeability, is developed, including a mixture of fluorinated alcohols A and B with boiling points between 50°C and 300°C, and a charge transportable compound, which reduces clogging and enhances film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solution containing fluorinated alcohol and charge transportable compound is used for inkjet method, then film formation is achieved, but dischargeability is insufficient and clogging occurs
Solution Approach 1:
The patent changes the physical and chemical parameters of the solvent system by selecting fluorinated alcohols with specific boiling point ranges (50-150°C for alcohol A, 150-300°C for alcohol B) and controlling their compositional ratios (10-90 mass% for alcohol B). These parameter changes optimize the solution's viscosity, surface tension, and evaporation characteristics to achieve both good dischargeability and prevent clogging in inkjet application
Solution Approach 2:
The patent uses a composite solvent system comprising two different fluorinated alcohols (A and B) with distinct boiling point ranges, combined with charge transportable compounds. This composite material approach allows the solution to exhibit synergistic properties: fluorinated alcohol A provides low-temperature evaporation for good dischargeability, while fluorinated alcohol B provides high-temperature stability and prevents clogging, achieving both requirements simultaneously
2Ease of operation
If fluorinated alcohol with specific boiling point range is used, then dischargeability is improved, but solution composition complexity increases
Solution Approach 1:
The patent simplifies the composition selection process by establishing clear parameter ranges: fluorinated alcohol A with boiling point 50-150°C and fluorinated alcohol B with boiling point 150-300°C, with alcohol B comprising 10-90 mass% of the total. These defined parameters provide a systematic framework that balances dischargeability improvement with composition manageability
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 composition improves dischargeability in inkjet methods, reduces clogging, and enables the production of high-quality films and light emitting devices with improved luminance life and film formability.
Implementation Method 1
a fluorinated alcohol A represented by the formula (1) and having a boiling point of 50°C or more and less than 150°C, a fluorinated alcohol B represented by the formula (1) and having a boiling point of 150°C or more and less than 300°C
Data Source
AI summary
To provide a composition that is excellent in dischargeability by an ink jet method and is less likely to cause clogging of an ink jet apparatus. A composition comprising a fluorinated alcohol A represented by the formula (1) and having a boiling point of 50°C or more and less than 150°C, a fluorinated alcohol B represented by the formula (1) and having a boiling point of 150°C or more and less than 300°C and a charge transportable compound, wherein the rate of the above-described fluorinated alcohol B with respect to 100 parts by mass of the sum of the above-described fluorinated alcohol A and the above-described fluorinated alcohol B is 10 parts by mass to 90 parts by mass: CnFH2nF+1-mFFmFOH (1) (In the formula (1), nF is an integer of 1 to 12 and mF is an integer of 1 to 25, provided that 2nF+1 ≥ mF.).