Quantum Dot Ink Ester Solvent Printability
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Solution Overview
Problem
Current quantum dot inks for electroluminescent devices face challenges in achieving suitable viscosity and surface tension for large-area printing, which affects the charge transportation capacity and optoelectronic properties of the devices, limiting their application in optoelectronic devices.
Innovation Solution
A printing ink comprising inorganic nano-materials, specifically quantum dots, and an ester-based organic solvent with a boiling point ≥200°C and viscosity in the range of 1 cPs to 100 cPs, and surface tension between 19 dyne/cm to 50 dyne/cm, allowing for the formation of a uniform film and facilitating inkjet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dot inks contain polymer additives with high viscosity to control ink parameters, then the ink can be printed, but the charge transportation capacity of the film is reduced and optoelectronic properties are negatively impacted
Solution Approach 1:
The patent extracts and removes the harmful polymer additives from the ink formulation. By using a solvent system based on esters with high boiling points (≥200°C) and specific viscosity ranges (1-100 cPs) without adding polymer thickeners, the solution eliminates the source of the problem while maintaining printability through the inherent properties of the ester solvents.
Solution Approach 2:
The patent changes the physical parameters of the ink by selecting esters with specific boiling points (≥200°C) and viscosity ranges (1-100 cPs). This parameter optimization allows the ink to achieve suitable rheological properties for printing without requiring polymer additives, thereby maintaining charge transportation capacity.
2Area of stationary object
If quantum dot inks are formulated for large-area printing, then manufacturing area increases, but achieving suitable viscosity and surface tension becomes more difficult
Solution Approach 1:
The patent optimizes the viscosity parameter by selecting esters with viscosity in the range of 1-100 cPs and surface tension in the range of 19-50 dyne/cm. These parameter adjustments enable the ink to be suitable for large-area printing applications while maintaining proper flow characteristics.
3Ease of manufacture
If traditional solvents are used in quantum dot inks, then the ink can be prepared, but the film uniformity and device performance are compromised
Solution Approach 1:
The patent changes the solvent type from traditional solvents to esters with high boiling points (≥200°C). This parameter change improves film uniformity by enabling better solvent evaporation control and quantum dot dispersion, while the esters still provide adequate solubility for ink preparation.
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 enables the production of high-quality quantum dot films with improved uniformity and performance, enhancing the capabilities of quantum dot-based optoelectronic devices by adjusting viscosity and surface tension to optimal ranges.
Implementation Method 1
the ester-based organic solvent is able to be evaporated from a solvent system and form an inorganic nano-material film
Data Source
AI summary
Provided are a printing ink comprising inorganic nano-materials and an electronic device manufactured by printing with the printing ink, in particular, an electroluminescent device. The composition of the provided ink comprises at least one inorganic nano-material, in particular, quantum dots, and at least one ester-based organic solvent.