Ink Composition for Electrophoresis Using Nanorod Dispersion Stability

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Solution Overview

Problem

The dispersion stability of semiconductor nanorods in solutions or polymerizable compounds is severely deteriorated, especially for nano-scale GaN-based or InGaN-based compound semiconductors, making it difficult to effectively mount and align ultra-small LED devices for large-area coatings and displays.

Innovation Solution

An ink composition for electrophoresis apparatus is developed, comprising semiconductor nanorods coated with metal oxides like alumina or silica, and a solvent with high viscosity and low dielectric constant, such as compounds represented by Chemical Formula 1, which improves dispersion stability and dielectrophoretic properties, allowing for efficient inkjetting or slit-coating of nanorods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If semiconductor nanorods are used in solution for electrophoresis, then dielectrophoretic properties are improved, but dispersion stability is severely deteriorated

Engineering Contradiction:

Improvedielectrophoretic propertiesVSAvoiddispersion stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent introduces a specifically designed solvent as an intermediary substance between the semiconductor nanorods and the electrophoresis process. This solvent contains functional groups that interact with the nanorod surfaces to maintain stable dispersion while preserving dielectrophoretic responsiveness. The solvent acts as a mediator that prevents direct aggregation of nanorods during storage and handling, yet allows them to respond effectively to electric fields during electrophoresis.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the chemical and physical parameters of the solvent system to achieve optimal balance between dispersion stability and dielectrophoretic properties. By adjusting solvent composition, viscosity, and chemical structure (as represented by Chemical Formula 1 with specific R groups and molecular weight), the patent creates conditions where nanorods remain stably dispersed during storage but maintain high dielectrophoretic mobility during the electrophoresis process.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If ultra-small LED devices are manufactured at nano-scale, then device size is reduced, but manual disposition and mounting becomes impossible

Engineering Contradiction:

Improvedevice sizeVSAvoidmanual disposition and mounting

Core Design Contradiction:

Volume of moving objectVSEase of operation

Solution Approach 1:

The patent replaces manual mechanical handling with an automated electrophoresis-based positioning system. Instead of attempting to manually manipulate nano-scale LED devices, the invention uses dielectrophoretic forces generated by electric fields to automatically transport, align, and position the nanorods on substrates. This substitution of mechanical manipulation with field-based control enables precise positioning of ultra-small devices that are far below manual handling capabilities.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Stability of the object's composition

If nanorod dispersion is improved in solution, then dispersion stability increases, but dielectrophoretic properties are deteriorated

Engineering Contradiction:

Improvedispersion stabilityVSAvoiddielectrophoretic properties

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent applies different functional characteristics to different aspects of the solvent-nanorod interaction. The solvent is designed to provide steric or electrostatic stabilization locally at the nanorod surface to prevent aggregation, while simultaneously maintaining bulk properties that allow strong dielectrophoretic response. This local differentiation of functional quality enables the system to achieve both stable dispersion and high dielectrophoretic mobility without compromise.

Inventive Principle:

Principle #3Local 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 ink composition achieves excellent dispersion stability and high electrophoretic rates, enabling effective large-area coating and panel production with improved luminance and reduced sedimentation of nanorods.

Implementation Method 1

a solvent with high viscosity and low dielectric constant, such as compounds represented by Chemical Formula 1, which improves dispersion stability

Methodology Applied

Scientific EffectViscosity:

Implementation Method 2

a solvent with high viscosity and low dielectric constant, such as compounds represented by Chemical Formula 1

Methodology Applied

Scientific EffectDielectric constant: Dielectric Permittivity

Implementation Method 3

ink composition for electrophoresis apparatus having excellent dispersion stability and high dielectrophoretic properties of semiconductor nanorods

Methodology Applied

Scientific EffectDielectrophoresis:

Data Source

PatentUS20230227994A1Ink composition for electrophoresis device and display device using same

Publication Date: 2023.07.20 SAMSUNG SDI CO LTD

AI summary

Disclosed are an ink composition for an electrophoresis apparatus including (A) a semiconductor nanorod; and (B) a compound represented by Chemical Formula 1, and a display device manufactured using the ink composition for an electrophoresis apparatus.