Semiconductor Nanorod Ink Composition for Stable Electrophoretic Alignment
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Solution Overview
Problem
The dispersion stability of semiconductor nanorods in solutions is poor, leading to sedimentation and agglomeration issues, which hampers their alignment and use in nano-scale LED devices, particularly in electrophoresis processes, due to the low viscosity and high volatility of conventional organic solvents.
Innovation Solution
A three-component solvent system is developed, comprising a first solvent with a viscosity of ≤70 cps at 25°C and a dielectric constant ≥5, a second solvent with a viscosity ≥80 cps at 25°C or being a solid with a dielectric constant ≥5, and a third solvent with a dielectric constant <5, along with semiconductor nanorods coated with metal oxides like alumina or silica, to enhance dispersion stability and electrophoretic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional organic solvents are used to disperse semiconductor nanorods, then the nanorods can be dispersed in solution, but the dispersion stability is poor leading to sedimentation and agglomeration
Solution Approach 1:
The patent changes the physical and chemical parameters of the solvent system by selecting specific solvents with controlled viscosity (≥80 cP at 25°C) and dielectric constant (≥5), thereby improving the dispersion stability of semiconductor nanorods and preventing sedimentation and agglomeration
Solution Approach 2:
The patent uses a composite solvent system comprising multiple components including high viscosity solvents and solvents with specific dielectric constants, creating a composite medium that provides both stable dispersion and prevents agglomeration of nanorods
2Ease of operation
If low viscosity solvents are used for ink jetting, then ink jetting properties are improved, but storage stability of nanorods deteriorates
Solution Approach 1:
The patent optimizes the viscosity parameter of the solvent to be ≥80 cP at 25°C, which provides sufficient storage stability for nanorods while maintaining compatibility with ink jetting processes through controlled temperature conditions
Solution Approach 2:
The patent employs a dynamic approach where the solvent viscosity is optimized for storage conditions, and temperature control is used during ink jetting to temporarily reduce viscosity for proper flow, thus balancing storage stability with processing ease
3Speed
If high volatility solvents are used for ink jetting, then drying speed is improved, but dispersion stability and alignment quality deteriorate
Solution Approach 1:
The patent selects solvents with high dielectric constant (≥5) and controlled volatility, where the dielectric constant optimization improves electrophoretic alignment quality while the controlled volatility maintains adequate drying speed for ink jetting applications
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 solution provides excellent electrophoretic, ink-jetting, and storage stability, allowing for improved alignment and patterning of semiconductor nanorods, maintaining high viscosity at room temperature while enabling ink-jetting at elevated temperatures, thus overcoming the limitations of conventional solvents.
Implementation Method 1
the first solvent has a viscosity of less than or equal to 70 cps at 25° C.... the second solvent includes a compound having a viscosity of greater than or equal to 80 cps at 25° C.
Implementation Method 2
the first solvent... includes a compound having a dielectric constant of greater than or equal to 5, the second solvent includes a compound having... a dielectric constant of greater than or equal to 5, and the third solvent includes a compound having a dielectric constant of less than 5
Implementation Method 3
research on a curable composition containing semiconductor nanorods capable of improving dispersion stability in a solvent (or polymerizable compound) of semiconductor nanorods and implementing a high dielectrophoresis rate
Data Source
AI summary
Disclosed are an ink composition, a layer manufactured using the ink composition, and an electrophoresis device and a display device including the same. The ink composition includes (A) a semiconductor nanorod; and (B) a mixed solvent including a first solvent, a second solvent, and a third solvent, wherein the first solvent has a viscosity of less than or equal to 70 cps at 25° C. and includes a compound having a dielectric constant of greater than or equal to 5, the second solvent includes a compound having a viscosity of greater than or equal to 80 cps at 25° C. or being a solid or having a dielectric constant of greater than or equal to 5, and the third solvent includes a compound having a dielectric constant of less than 5.