Chelated Quantum Dot Precursors for Smooth Micro-LED Color Layers
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Solution Overview
Problem
Existing techniques for manufacturing micro-LED displays face challenges in precisely and cost-effectively depositing color conversion agents, such as quantum dots, onto different pixels on a substrate, due to issues with alignment accuracy, resolution, and throughput.
Innovation Solution
A photocurable composition is developed, comprising quantum dots, quantum dot precursor materials, a chelating agent, one or more monomers, and a photoinitiator. This composition is designed to stabilize quantum dot precursor materials and inhibit their aggregation, facilitating the formation of smooth color conversion layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dot precursor materials are used in color conversion layers, then the ability to convert short wavelength light to longer wavelength light is improved, but metal-containing aggregates form causing particulate defects
Solution Approach 1:
The patent introduces chelating agents as intermediary substances that bind to metal ions in quantum dot precursor materials. These chelating agents act as mediators that prevent metal ion aggregation while allowing the precursor materials to function in color conversion. The chelating agents form stable complexes with metal ions, preventing them from forming harmful aggregates during the color conversion process.
Solution Approach 2:
The patent modifies the chemical environment by introducing chelating agents that change the binding parameters of metal ions. This parameter change transforms the free metal ions into chelated complexes, fundamentally altering their aggregation behavior and preventing particulate formation while maintaining color conversion functionality.
2Stability of the object's composition
If chelating agents are added to stabilize quantum dot precursor materials, then aggregation of metal atoms is inhibited, but the composition complexity increases
Solution Approach 1:
The chelating agents perform multiple functions simultaneously: they stabilize quantum dot precursor materials, prevent metal ion aggregation, and maintain the integrity of the color conversion layer. This multi-functionality reduces the need for additional separate additives or processing steps, thereby limiting the increase in composition complexity while achieving multiple stabilization goals.
3Manufacturing precision
If selective deposition techniques are used to deposit color conversion agents, then alignment accuracy is improved, but throughput decreases
Solution Approach 1:
The patent extracts the color conversion capability from the quantum dot precursor materials themselves, allowing them to be deposited as stable precursors that maintain their function without requiring complex selective deposition. The chelating agents enable the precursor materials to be handled and deposited more easily while maintaining precision and enabling higher throughput processing.
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 use of the photocurable composition with chelating agents reduces the formation of metal-containing aggregates, resulting in smooth color conversion layers free of particulates, thereby enhancing the manufacturing efficiency and quality of micro-LED displays.
Implementation Method 1
The chelating agent is configured to chelate the quantum dot precursor materials
Implementation Method 2
The photoinitiator initiates polymerization of the one or more monomers in response to absorption of radiation in the second wavelength band
Implementation Method 3
The quantum dots are selected to emit radiation in a first wavelength band in the visible light range in response to absorption of radiation in a second wavelength band in the UV or visible light range
Data Source
AI summary
A photocurable composition includes quantum dots, quantum dot precursor materials, a chelating agent, one or more monomers, and a photoinitiator. The quantum dots are selected to emit radiation in a first wavelength band in the visible light range in response to absorption of radiation in a second wavelength band in the UV or visible light range. The second wavelength band is different than the first wavelength band. The quantum dot precursor materials include metal atoms or metal ions corresponding to metal components present in the quantum dots. The chelating agent is configured to chelate the quantum dot precursor materials. The photoinitiator initiates polymerization of the one or more monomers in response to absorption of radiation in the second wavelength band.