Thiol Monomer Polymer Matrix for Nanocrystal Stability
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Solution Overview
Problem
There is a need for semiconductor nanocrystals with improved properties such as stability, luminous efficacy, and color purity to enhance their application in display devices.
Innovation Solution
A composition for a light emitting particle-polymer composite is developed, comprising a light emitting particle, a first monomer with at least two thiol groups, and a second monomer with unsaturated carbon-carbon bonds, which are polymerized to form a stable polymer matrix for the nanocrystals, improving device efficiency and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor nanocrystals are used in display devices, then optoelectronic properties can be controlled by adjusting size, but stability and lifetime are insufficient
Solution Approach 1:
The patent creates a composite material system consisting of semiconductor nanocrystals embedded in a polymer matrix formed from thiol-containing monomers. This composite structure combines the size-tunable optoelectronic properties of nanocrystals with the stabilizing protective environment of the polymer matrix, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The polymer matrix acts as an intermediary between the semiconductor nanocrystals and the external environment. The thiol groups in the polymer provide protective coordination to the nanocrystal surfaces while maintaining the desired optoelectronic properties, thus mediating between the need for stability and the need for functional performance.
2Manufacturing precision
If semiconductor nanocrystals are synthesized with controlled size and structure, then color purity and luminous efficacy improve, but device lifetime remains limited
Solution Approach 1:
The patent applies beforehand cushioning by incorporating the nanocrystals into a protective polymer matrix before device operation begins. The thiol-containing polymer provides pre-established protection against degradation mechanisms such as oxidation and aggregation, cushioning the nanocrystals from harmful environmental factors before they can cause damage.
Solution Approach 2:
The patent utilizes parameter changes by controlling the polymerization conditions to optimize the polymer matrix structure. By adjusting monomer ratios, molecular weight, and crosslinking density, the polymer matrix properties are tuned to provide maximum protection while maintaining the nanocrystals' size-controlled optoelectronic properties.
3Reliability
If a polymer matrix is formed around nanocrystals, then stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the nanocrystal dispersion and polymer matrix formation steps into a single integrated process. The thiol-containing monomers are mixed with the nanocrystals before polymerization, combining the protective encapsulation and matrix formation into one step, thereby reducing manufacturing complexity while maintaining stability.
Solution Approach 2:
The thiol groups in the monomers provide self-service by automatically coordinating to the nanocrystal surfaces during polymerization. This self-organizing behavior reduces the need for complex surface treatment steps or separate encapsulation processes, simplifying manufacturing while ensuring stable nanocrystal incorporation.
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 light emitting particle-polymer composite exhibits enhanced stability and efficiency, maintaining performance for extended periods, particularly in optoelectronic devices like LEDs and OLEDs, with improved luminance and photoconversion efficiency.
Implementation Method 1
a first monomer including at least two thiol groups, each located at a terminal end of the first monomer; and a second monomer including at least two unsaturated carbon-carbon bonds, each located at a terminal end of the second monomer
Data Source
AI summary
A composition comprising: a first monomer comprising at least three thiol groups, each located at a terminal end of the first monomer, wherein the first monomer is represented by the following Chemical Formula 1-1:a second monomer comprising at least two unsaturated carbon-carbon bonds, each located at a terminal end of the second monomer, wherein the second monomer is represented by the following Chemical Formula 2:wherein in Chemical Formulae 1 and 2 groups R2, Ra to Rd, Ya to Yd, L1′ and L2, X and variables k3 and k4 are the same as described in the specification, and a first light emitting particle, wherein the first light emitting particle consists of a semiconductor nanocrystal comprising a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, or a combination thereof, wherein the first light emitting particle has a core/shell structure having a first semiconductor nanocrystal being surrounded by a second semiconductor nanocrystal, and the first semiconductor nanocrystal being different from the second semiconductor nanocrystal.