Quantum Dot Patterning via Electrospray Ionization
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Solution Overview
Problem
Current quantum dot display technologies face challenges in creating high-quality, high-density patterns with minimal contamination, especially for electroluminescent quantum dots, as existing methods like photolithography and inkjet printing cause residual contamination, and transfer printing struggles to scale for large flexible displays.
Innovation Solution
The method involves using electrospray ionization and an ionic lens, such as a conductive or insulator lens, to selectively deposit electrically charged quantum dots onto targeted microscopic areas, minimizing cross-contamination and enabling direct deposition onto electrodes, thus simplifying the display structure and reducing the need for multiple layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is used to pattern quantum dots, then high manufacturing precision can be achieved, but residual organic contamination from photoresist reduces optical performance
Solution Approach 1:
The patent extracts and removes the photoresist layer after quantum dot patterning through oxygen plasma treatment. This separation eliminates the contamination problem by removing the harmful photoresist organic material while preserving the patterned quantum dots, thus resolving the contradiction between achieving high patterning precision and avoiding organic contamination
Solution Approach 2:
The patent employs oxygen plasma, a strong oxidizing environment, to completely decompose and remove the organic photoresist material. This accelerated oxidation process efficiently eliminates residual organic contamination from the quantum dot patterns, improving optical performance while maintaining the precision achieved during photolithography
2Adaptability or versatility
If transfer printing with viscoelastic stamps is used, then flexible display production is enabled, but scaling to large area displays is difficult
Solution Approach 1:
The patent segments the quantum dot ink into aerosol droplets that can be independently deposited across large areas. This aerosol-based approach allows parallel deposition over extended surfaces without the mechanical constraints of stamp-based transfer printing, enabling both flexibility and large-scale production
Solution Approach 2:
The patent utilizes aerosol technology, which involves pneumatic principles for generating and controlling fine liquid droplets in gas flow. This approach enables precise control of quantum dot deposition over large flexible areas, overcoming the scaling limitations of viscoelastic stamp transfer printing while maintaining flexibility
3Area of stationary object
If inkjet printing is used to deposit quantum dots, then large area coverage is achieved, but residual organic contamination from carrier liquid reduces optical performance
Solution Approach 1:
The patent exploits the phase transition of the carrier liquid from liquid to vapor through evaporation. By controlling the evaporation process, the carrier liquid is completely removed after deposition, leaving only the quantum dots without residual organic contamination, thus maintaining high optical performance across large areas
Solution Approach 2:
The patent rapidly evaporates the carrier liquid immediately after deposition, rushing through the drying phase to eliminate contamination before it can affect the quantum dot optical properties. This quick phase transition approach prevents residual liquid from degrading performance while maintaining large area coverage
4Stability of the object's composition
If quantum dots are produced by liquid solution-based process, then material stability is improved, but integration into traditional microfabrication techniques is difficult
Solution Approach 1:
The patent replaces traditional mechanical microfabrication techniques with aerosol-based deposition. This substitution allows liquid solution-based quantum dot ink to be deposited in a controlled manner similar to conventional fabrication processes, enabling easy integration while preserving the material stability benefits of solution-based quantum dot production
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
This approach allows for precise patterning of quantum dots with reduced contamination, improving display performance by ensuring each pixel type contains only the desired quantum dots, enabling the production of flexible, large-scale, and high-density quantum dot displays with enhanced optical performance.
Implementation Method 1
forming the electrically charged quantum dots in air, in a pure and discrete manner from other materials, by passing the liquid solution containing quantum dots through the process of electrospray ionization
Implementation Method 2
Focusing quantum dots through the holes that define the sub-pixel by means of electric force
Implementation Method 3
high electrical voltage directly supplies a carrier liquid containing quantum dots to a surface in the electrohydrodynamic jet printing method
Data Source
AI summary
The present invention relates to a patterning method for producing optical displays and electronic/electro-optical devices based on quantum dots. By means of the invention, a pixelated multi-colored display containing quantum dots with no significant contamination can be produced, and quantum dots can be selectively patterned in targeted microscopic fields on an optical surface, with very little contamination.