Chelated Quantum Dot Precursors for Smooth Micro-LED Color Layers
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Solution Overview
Problem
Current methods for manufacturing micro-LED displays face challenges in precisely and cost-effectively depositing color conversion agents, such as quantum dots, onto substrates due to issues with alignment accuracy, resolution, and throughput, leading to defects like metal aggregates in color conversion layers.
Innovation Solution
A photocurable composition comprising quantum dots, quantum dot precursor materials, a chelating agent, and a photoinitiator is used, where the chelating agent stabilizes the quantum dot precursor materials, preventing aggregation and facilitating the formation of smooth color conversion layers through photopolymerization initiated by specific wavelength radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shadow masks are used for selective deposition of color conversion agents, then deposition coverage is improved, but alignment accuracy and scalability deteriorate
Solution Approach 1:
The patent replaces the mechanical shadow mask system with a chemical deposition system using chelating agents. Instead of physically blocking light with a mask, the invention uses chemical complexes that selectively bind metal ions to control where quantum dots form, eliminating alignment issues while maintaining deposition coverage.
Solution Approach 2:
The patent introduces chelating agents as intermediary substances that mediate between the metal ion precursors and the quantum dot formation process. These chelating agents selectively bind metal ions at desired locations, controlling quantum dot nucleation and growth without requiring precise mechanical alignment.
2Manufacturing precision
If inkjet or aerosol jet printing is used for selective deposition, then resolution or accuracy is improved, but throughput deteriorates
Solution Approach 1:
The patent replaces sequential inkjet or aerosol jet printing with a parallel chemical deposition approach. Multiple quantum dot colors can form simultaneously across the entire substrate through uniform exposure to light, dramatically increasing throughput while maintaining high resolution through the selective binding properties of different chelating agents.
Solution Approach 2:
The patent performs preliminary action by pre-forming chelating agent-metal ion complexes throughout the substrate before exposure. This allows all quantum dot locations to be prepared simultaneously, and upon light exposure, quantum dots form in parallel across the entire substrate rather than being deposited sequentially.
3Device complexity
If quantum dot precursor materials are deposited without chelating agents, then deposition simplicity is improved, but aggregation and defect formation worsen
Solution Approach 1:
The patent introduces chelating agents as intermediary substances that mediate between the metal ion precursors and the quantum dot formation process. These chelating agents selectively bind metal ions at desired locations, controlling quantum dot nucleation and growth without requiring precise mechanical alignment.
Solution Approach 2:
The patent converts the potentially harmful aggregation of metal ions into a beneficial controlled nucleation process. By using chelating agents, the metal ion aggregation that would normally create defects is redirected to form uniform quantum dots at specific locations, turning a reliability problem into a precision tool.
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 solution reduces or inhibits the formation of metal-containing aggregates, resulting in smooth color conversion layers free of particulates, enhancing the quality and reliability 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
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.