Quantum Dot Silicone Paste Delivery for LED Color Stability
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Solution Overview
Problem
Current methods for delivering quantum dots in solid state lighting applications face challenges such as property changes due to solvent storage, handling hazards, and limited shelf life, which affect their performance and stability.
Innovation Solution
Quantum dots are delivered in a silicone paste or as a powder, eliminating the need for organic solvents and enhancing stability, allowing for automated handling and integration into LED systems without compromising their photoluminescent properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are stored in organic solvents like toluene, then they can be transported safely, but the solvents are toxic and flammable requiring special handling
Solution Approach 1:
The patent extracts and removes the organic solvent from the quantum dot storage system, replacing it with a solid-state or water-based storage medium. This eliminates the harmful properties of organic solvents while maintaining the quantum dots in a transportable and stable form.
Solution Approach 2:
The patent introduces an intermediary substance (such as a solid matrix or water-based carrier) that mediates between the quantum dots and the storage environment, replacing the harmful organic solvent. This intermediary provides a safe alternative that maintains quantum dot stability without the toxicity and flammability issues.
2Ease of operation
If quantum dots are delivered in solvent, then handling is simplified, but property changes occur due to solvent storage
Solution Approach 1:
The patent removes the solvent from the delivery system, preventing solvent-induced property changes in the quantum dots. The quantum dots are delivered in a solvent-free or alternative medium that does not cause property changes, maintaining both ease of handling and compositional stability.
Solution Approach 2:
The patent changes the physical state or chemical composition of the delivery medium from organic solvent to solid-state or water-based carrier. This parameter change eliminates the harmful interactions between solvent and quantum dots while maintaining handling convenience through appropriate formulation.
3Manufacturing precision
If phosphor powders are used in A/B silicone, then color targets can be achieved, but the mixture has limited shelf life and requires quick dispensing
Solution Approach 1:
The patent segments the phosphor delivery system into separate components that can be stored independently with extended shelf life, then combined at the point of use. This separation prevents the shelf life limitation of pre-mixed phosphor-silicone while maintaining color target accuracy through controlled mixing.
Solution Approach 2:
The patent performs preliminary preparation of phosphor materials in a stable, long-shelf-life form, then completes the mixing and dispensing process at the point of use. This preliminary action allows for extended storage without settlement or agglomeration, while maintaining color precision through controlled final mixing.
4Productivity
If automated dispensing equipment is used for traditional phosphors, then productivity increases, but the abrasive nature of phosphor materials requires hardened steel tooling
Solution Approach 1:
The patent changes the physical form or chemical composition of the phosphor material to reduce its abrasive properties. This parameter change allows for automated dispensing using standard tooling materials rather than requiring hardened steel, simplifying the equipment while maintaining high productivity through automation.
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 method ensures stable quantum dot performance over time, facilitates safe handling, and enables high-volume production with precise color targeting, improving the efficiency and reliability of LED lighting solutions.
Implementation Method 1
quantum dots absorb light of a particular first (available or selected) wavelength, usually blue, and then emit light at a second wavelength, usually red or green
Implementation Method 2
color pigment in the paste tends to stay in suspension with minimum settling or agglomeration
Data Source
AI summary
An LED is fabricated with a composite layer including quantum dots (QDs), wherein the QDs are provided in a silicone paste. A plurality of QD silicone paste reservoirs each contain a provided silicone paste with QDs of different wavelengths. Further, a silicone paste reservoir containing a clear silicone paste. A paste mixing chamber, in to which the QD paste reservoirs and the silicone paste reservoir supply their respective pastes, mixes together the pastes and form a mixed QD silicone paste. A silicone mixing and metering component receives the mixed QD silicone paste from the paste mixing chamber, and further receives A silicone and B silicone from a respective A silicone reservoir and a B silicone reservoir, measures, and mixes the mixed QD silicone paste with the A and B silicones to form a silicone polymer composite. A dispensing component receives to the silicone polymer composite from the mixing and metering component and dispenses the composite to a molding tool.