Quantum Dot Ink Composition for Stable Inkjet Deposition
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Solution Overview
Problem
Existing light-emitting devices face challenges in properly jetting nanoparticle ink compositions due to variations in surface tension, viscosity, and boiling point, leading to inkjet failures.
Innovation Solution
A nanoparticle ink composition with inorganic nanoparticles, such as quantum dots or metal oxides, is formulated within a specific Ohnesorge number range of 0.1 to 0.2, using solvents like alcohol-based or ether-based solvents to stabilize ink droplets and prevent nozzle clogging, allowing stable jetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nanoparticle ink composition is used for jetting, then light-emitting device manufacturing is enabled, but inkjet failures occur due to variations in surface tension, viscosity, and boiling point
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Ohnesorge number (a dimensionless number involving viscosity, surface tension, and density) within the range of 0.05 to 0.5, and preferably 0.1 to 0.3. This parameter optimization resolves the contradiction by adjusting the ink composition parameters to achieve both manufacturability and jetting reliability, preventing inkjet failures while enabling light-emitting device production
2Manufacturing precision
If nanoparticle ink composition is jetted, then nanoparticle layers can be deposited, but nozzle clogging occurs
Solution Approach 1:
The patent uses parameter changes by optimizing the Ohnesorge number range (0.05 to 0.5, preferably 0.1 to 0.3) to control the flow characteristics of the nanoparticle ink. This prevents nozzle clogging while maintaining manufacturing precision for nanoparticle layer deposition, as the optimized parameters ensure smooth ink flow through the jetting system
Solution Approach 2:
The patent introduces an intermediary approach by using the Ohnesorge number as a mediating parameter that balances multiple properties (viscosity, surface tension, density) of the ink composition. This intermediary parameter enables the ink to flow smoothly through the jetting system without clogging, while still achieving precise nanoparticle layer deposition
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 enables stable jetting of ink droplets, preventing nozzle clogging and ensuring consistent deposition of nanoparticle layers in light-emitting devices, enhancing manufacturing efficiency and device performance.
Implementation Method 1
Existing light-emitting devices face challenges in properly jetting nanoparticle ink compositions due to variations in surface tension, viscosity, and boiling point
Implementation Method 2
Existing light-emitting devices face challenges in properly jetting nanoparticle ink compositions due to variations in surface tension, viscosity, and boiling point
Implementation Method 3
A nanoparticle ink composition with inorganic nanoparticles, such as quantum dots or metal oxides, is formulated within a specific Ohnesorge number range of 0.1 to 0.2, using solvents like alcohol-based or ether-based solvents to stabilize ink droplets
Data Source
AI summary
A nanoparticle ink composition includes: a solvent; and one or more inorganic nanoparticles substantially dispersed in the solvent, wherein the inorganic nanoparticles include one or more quantum dots or a metal oxide having a diameter of about 20 nm or less, and the nanoparticle ink composition has an Ohnesorge number of about 0.1 to about 0.2.