Crosslinked Ligands for Nanoparticle Stability
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Solution Overview
Problem
Semiconducting light emitting nanoparticles face stability issues under extreme conditions such as elevated heat and high light flux, and are prone to ligand detachment due to aggregation and polymerization processes, which reduces their emission quantum yield and makes them unsuitable for conductive applications like electroluminescent devices.
Innovation Solution
A semiconducting light emitting nanoparticle with a core and shell layers, surface-attached organic ligands A, B, and C, each with crosslinkable functional groups X, Y, and Z, forming a polymeric outer layer through direct linkages, providing steric protection and preventing ligand detachment without the need for additional materials or agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer layers are applied to protect semiconducting nanoparticles, then protection against outside elements is improved, but emission quantum yield drops due to aggregation and ligand detachment
Solution Approach 1:
The patent applies nested protection by forming a polymeric outer layer through crosslinking of ligands that are already attached to the nanoparticle surface. This creates a nested structure where the crosslinked ligand network is embedded within and integrated with the nanoparticle surface, providing protection without the need for separate external polymer layers that cause aggregation and quantum yield loss.
Solution Approach 2:
The patent employs self-service by using the nanoparticle's own surface-attached ligands to form the protective polymeric structure through crosslinking. The ligands that are already bound to the nanoparticle surface serve dual functions: maintaining surface attachment and forming the protective crosslinked network, eliminating the need for external protective layers that would cause harmful aggregation effects.
2Reliability
If additional polymer layers are used for protection, then stability is improved, but device complexity increases due to multiple layers and materials
Solution Approach 1:
The patent merges the protective function with the existing ligand layer by crosslinking the surface-attached ligands. Instead of adding separate protective polymer layers, the protective polymeric structure is formed by crosslinking the ligands that are already part of the nanoparticle assembly, combining the ligand attachment function with the protection function in a single integrated structure.
Solution Approach 2:
The crosslinked ligand structure serves multiple functions simultaneously: it maintains ligand attachment to the nanoparticle surface, provides steric protection against aggregation, and creates a stable polymeric network that resists external elements. This multi-functional structure eliminates the need for separate protective layers and simplifies the overall device architecture.
3Stability of the object's composition
If crosslinking agents are added for ligand crosslinking, then ligand stability is improved, but purity is reduced due to residual agents
Solution Approach 1:
The patent employs self-service by using the functional groups on the nanoparticle's own surface-attached ligands to perform the crosslinking function. The ligands contain crosslinkable functional groups that react with each other directly, eliminating the need for external crosslinking agents. This self-crosslinking mechanism achieves ligand stabilization without introducing foreign substances that would compromise purity.
4Productivity
If semiconducting nanoparticles are used in high concentration, then device performance is improved, but aggregation occurs reducing quantum yield
Solution Approach 1:
The patent applies preliminary action by forming the crosslinked polymeric outer layer on each nanoparticle before the nanoparticles are incorporated into the final device structure. This pre-formed crosslinked network provides steric protection that prevents aggregation even when nanoparticles are concentrated in the final application, allowing high concentration use without quantum yield loss.
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 polymeric outer layer enhances the stability and quantum yield of the nanoparticles, allowing for highly concentrated layers in optoelectric devices and maintaining performance under radical-rich environments.
Implementation Method 1
at least one organic ligand A comprises a crosslinkable functional group X, at least one organic ligand B comprises a crosslinkable functional group Y, and at least one organic ligand C comprises a crosslinkable functional group Z, characterized in that groups X, Y and Z are each capable of acting as a crosslinking acceptor and as a crosslinking donator
Implementation Method 2
the polymeric outer layer enhances the stability and quantum yield of the nanoparticles, allowing for highly concentrated layers in optoelectric devices and maintaining performance under radical-rich environments
Data Source
AI summary
The present invention relates to a semiconducting light emitting nanoparticle comprising a polymeric layer.