Quantum Dot Complex With Polymeric Ligands For Ink Viscosity Control
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Solution Overview
Problem
Current quantum dot inks for ink-jet printing face challenges with high boiling point solvents and additives like surfactants, which impair the performance of quantum dot films due to high temperature treatments and impurities, affecting light-emitting efficiency.
Innovation Solution
A quantum dot complex is developed with polymeric chain ligands that accurately control viscosity and surface tension, allowing the use of low boiling point solvents without additives, achieved through coordination bonding and active polymerization, ensuring quantum dot purity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high boiling point solvents and additives (surfactants, viscosity regulators) are used in quantum dot ink, then the ink can achieve suitable viscosity and surface tension for ink-jet printing, but the quantum dot purity is reduced and light-emitting efficiency deteriorates due to impurities and high temperature treatment requirements
Solution Approach 1:
The patent removes harmful additives (surfactants, viscosity regulators) and high boiling point solvents from the quantum dot ink system. Instead, it uses purely organic ligands with tailored molecular structures to control ink properties, thereby extracting the harmful components while maintaining functionality
Solution Approach 2:
The patent changes the molecular parameters of the ligands (using polymeric chains with controlled molecular weight and specific functional groups) to achieve the desired viscosity and surface tension without requiring high boiling point solvents or additives. This allows low boiling point solvent removal at lower temperatures
2Ease of manufacture
If conventional ligands are used on quantum dots, then the quantum dot material can be synthesized, but the viscosity and surface tension of the ink cannot be effectively controlled without adding surfactants and viscosity regulators
Solution Approach 1:
The patent merges the functions of quantum dot stabilization, viscosity control, and surface tension regulation into a single polymeric ligand molecule. The ligand contains both coordination units for quantum dot binding and polymeric chains for controlling bulk ink properties, eliminating the need for separate additives
Solution Approach 2:
The patent uses composite ligand structures combining coordination units (for quantum dot binding) and polymeric chains (for viscosity and surface tension control). This composite approach allows simultaneous achievement of quantum dot stability and ink processability
3Temperature
If low boiling point solvents are used in quantum dot ink, then the solvent can be removed at low temperature preserving quantum dot performance, but the ink cannot achieve suitable viscosity and surface tension without additives
Solution Approach 1:
The patent changes the physical parameters (viscosity, surface tension) through ligand molecular weight and structure rather than through solvent selection or additives. This enables the use of low boiling point solvents while maintaining ink processability
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 effectively regulates the viscosity and surface tension of the ink, maintaining quantum dot purity and light-emitting efficiency, suitable for high-resolution QLED displays without the need for high temperature treatments or additional additives.
Implementation Method 1
each of the polymeric chain ligands comprises a coordination unit and at least one polymeric chain, and the coordination unit connects the quantum dot with the polymeric chain
Implementation Method 2
the length of the polymeric chain is accurately controllable, so that the viscosity and surface tension of an ink containing the quantum dot complex can be effectively controlled
Implementation Method 3
the polymeric chain has a molecular weight distribution (a ratio of a weight average molecular weight to a number average molecular weight) of not more than 1.3
Data Source
AI summary
A quantum dot complex and its manufacturing method, intermediate and applications are provided. The quantum dot complex includes a quantum dot and a plurality of polymeric chain ligands, wherein each of the polymeric chain ligands includes a coordination unit and at least one polymeric chain, and the coordination unit connects the quantum dot with the polymeric chain; and the polymeric chain has a molecular weight distribution of not more than about 1.3. The surface of the quantum dot in the quantum dot complex is bonded to a plurality of polymeric chain ligands by coordination, and the length of the polymeric chain is accurately controllable, so that the viscosity and surface tension of an ink containing the quantum dot complex can be effectively controlled. Moreover, additives can be avoided and a low boiling point solvent can also be used, thereby ensuring the purity of the quantum dots in the ink.