Quantum Dot Polymer Composite Composition for Heat-Stable Luminescence
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Solution Overview
Problem
Quantum dot polymer composites face challenges in maintaining the luminous properties and stability of quantum dots due to their nano-size, which are affected by external environments and heat-treating processes during composite preparation.
Innovation Solution
A composition comprising quantum dots with an organic ligand, a binder polymer, a thiol compound with multiple thiol groups, a polyvalent metal compound, a photopolymerizable monomer, and a photoinitiator, where the binder polymer includes a copolymer with carboxylic acid groups and a multiple aromatic ring-containing polymer, stabilizing the quantum dots and enhancing their dispersibility and heat stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are dispersed in a polymer matrix to form a quantum dot polymer composite, then the luminous properties and stability of quantum dots are improved, but the preparation processes (e.g., heat-treating process) have substantial and adverse effects on their luminous properties
Solution Approach 1:
The patent introduces a binder polymer as an intermediary substance between quantum dots and the polymer matrix. This binder polymer specifically interacts with quantum dots through coordination bonds, forming a protective interface that shields quantum dots from harmful heat-treating processes while maintaining their luminous properties. The binder polymer acts as a mediator that enables stable dispersion without compromising quantum dot performance during composite preparation.
2Stability of the object's composition
If quantum dots are mixed with a solid state matrix to improve stability, then luminous properties are maintained, but preparation processes may have substantial adverse effects on their inherent properties
Solution Approach 1:
The patent modifies the chemical and physical parameters of the polymer matrix by incorporating a binder polymer with specific functional groups that can coordinate with quantum dots. This parameter change in the matrix composition creates a more favorable environment for quantum dots, maintaining their inherent properties during preparation while achieving stable composite formation. The binder polymer's specific chemical parameters enable gentle integration without harsh heat treatment.
3Stability of the object's composition
If quantum dots are dispersed in a polymer matrix, then process stability is improved, but the complexity of the composition increases due to multiple components
Solution Approach 1:
The binder polymer serves multiple functions simultaneously: it acts as a dispersing agent for quantum dots, a stabilizer during heat treatment, a binder for matrix formation, and a protective interface layer. This multi-functionality reduces the need for multiple separate additives, simplifying the overall composition while maintaining process stability. The universal role of the binder polymer manages composition complexity effectively.
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 achieves improved process stability and heat stability of quantum dot polymer composites, maintaining their photoconversion efficiency and dispersibility, leading to enhanced performance in electronic devices such as display and lighting devices.
Implementation Method 1
the thiol compound binds at least two quantum dots of the plurality of quantum dots to each other
Implementation Method 2
a photopolymerizable monomer having a carbon-carbon double bond; a photoinitiator
Data Source
AI summary
A composition including a plurality of quantum dots; a binder polymer; a thiol compound having at least two thiol groups; a polyvalent metal compound; a polymerizable monomer having a carbon-carbon double bond; a photoinitiator; and a solvent.