Diol-Based Nanorod Ink Composition for Stable Dispersion and Jetting
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Solution Overview
Problem
Existing methods struggle with the dispersion stability of semiconductor nanorods in solutions, particularly for ultra-small LED devices, leading to challenges in mounting and coating processes due to sedimentation and high viscosity issues.
Innovation Solution
An ink composition with a specific solvent system, including diol-based compounds, is developed to maintain high viscosity at room temperature for sedimentation stability and low viscosity at elevated temperatures for ink-jetting, incorporating semiconductor nanorods coated with metal oxides for improved dispersion and dielectrophoretic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the ink composition has high viscosity at room temperature, then sedimentation stability of semiconductor nanorods is improved, but ink-jetting properties deteriorate
Solution Approach 1:
The ink composition's viscosity is designed to be dynamic rather than static. At room temperature (20-25°C), the viscosity is ≥50 cps to prevent sedimentation, but at elevated temperatures (35-65°C), the viscosity drops to ≤20 cps to enable smooth ink-jetting. This temperature-dependent viscosity change allows the same ink to satisfy both stability and manufacturability requirements under different process conditions.
Solution Approach 2:
The invention changes the viscosity parameter of the ink composition based on temperature conditions. By formulating the ink with specific solvent components and concentration ratios, the viscosity is optimized to fall within ≥50 cps at room temperature for stability, and ≤20 cps at elevated temperatures for jetting performance. This parameter adjustment resolves the contradiction between stability and ease of manufacture.
2Length of moving object
If semiconductor nanorods are used for ultra-small LED devices, then device miniaturization is achieved, but dispersion stability in solution deteriorates
Solution Approach 1:
The ink composition acts as an intermediary medium that stabilizes semiconductor nanorods in solution. By carefully selecting solvent components and their ratios, the ink formulation prevents aggregation and sedimentation of nanorods, maintaining them in a stable dispersed state. This intermediary ink system enables the use of ultra-small nanorods while preserving their dispersion stability, thus resolving the contradiction between device miniaturization and material stability.
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 ensures excellent dispersion stability and dielectrophoretic properties, enabling efficient large-area coating and panel production of semiconductor nanorods, enhancing luminous efficiency and process reliability.
Implementation Method 1
the ink composition has a viscosity of greater than or equal to 50 cps at 20° C. to 25° C. and less than or equal to 20 cps at 35° C. to 65° C.
Implementation Method 2
The ink composition ensures excellent dispersion stability and dielectrophoretic properties, enabling efficient large-area coating and panel production of semiconductor nanorods
Data Source
AI summary
Provided are an ink composition, a layer prepared using the ink composition, and a display device comprising the layer, the ink composition comprising a solvent comprising (A) semiconductor nanorods, and (B) at least one diol-based compound, wherein the ink composition has a viscosity of at least 50 cps at 20° C. to 25° C. and at most 20 cps at 35° C. to 65° C.