Polyurethane Dispersant for Luminescent Particles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dispersants for inorganic luminescent particles in display devices suffer from poor dispersion properties and thermal resistance, leading to reduced luminous efficiency and lifetime due to agglomeration and sensitivity to oxygen and moisture, limiting solvent compatibility and enhancing self-quenching mechanisms.
Innovation Solution
A polyurethane-based dispersant with a Host-Guest molecular conformation and a pillar structure is developed, allowing dispersion in both polar and non-polar solvents, preventing agglomeration, and enhancing thermal resistance by encapsulating inorganic luminescent particles, thereby improving their quantum efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispersants are used for inorganic luminescent particles, then the particles can be dispersed in solution, but the dispersion properties and thermal resistance are poor, leading to particle agglomeration and reduced luminous efficiency
Solution Approach 1:
The dispersant molecule is segmented into distinct functional regions: a hydrophilic polyurethane backbone and hydrophobic pillar structures. This segmentation allows different parts of the molecule to interact with different components (solvent and luminescent particles), achieving both good dispersion and thermal resistance without excessive molecular complexity
Solution Approach 2:
The dispersant combines polyurethane polymer chains with pillar-like structural units to create a composite molecular architecture. This composite structure integrates the solubility and flexibility of polyurethane with the structural stability and thermal resistance of the pillar formations, resolving the contradiction between performance and complexity
2Ease of operation
If inorganic luminescent particles are exposed to oxygen and moisture during manufacturing and use, then the particles can be processed in air, but the particles deteriorate and luminous efficiency and lifetime are reduced
Solution Approach 1:
The dispersant acts as an intermediary protective layer between the inorganic luminescent particles and the external environment (oxygen and moisture). The amphiphilic structure of the dispersant allows it to remain in contact with both the particles and the aqueous environment, shielding the particles from harmful exposure while enabling air-based processing
Solution Approach 2:
The dispersant creates a protective microenvironment around each luminescent particle that acts as an inert barrier. This protective shell prevents direct contact between oxygen/moisture and the particle surface, maintaining luminous efficiency and lifetime while allowing the overall system to be processed in air
3Use of energy by moving object
If quantum dots are used as inorganic luminescent particles, then high luminous efficiency can be achieved, but the particles have poor thermal resistance and are vulnerable to deterioration
Solution Approach 1:
The dispersant forms a flexible protective shell around the quantum dots through its polyurethane backbone structure. This shell is soft enough to accommodate the quantum dots while providing thermal protection, allowing the quantum dots to maintain high luminous efficiency without suffering from poor thermal resistance
4Adaptability or versatility
If specific type solvents are used to form quantum dot film, then quantum dots can be dispersed, but the solvent compatibility is limited and dispersion properties are poor
Solution Approach 1:
The dispersant is designed with universal compatibility for both polar and non-polar solvents through its amphiphilic structure. The polyurethane backbone provides polarity for interaction with polar solvents, while the hydrophobic pillar structures provide compatibility with non-polar solvents, enabling versatile solvent use without compromising dispersion properties
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 polyurethane-based dispersant effectively disperses inorganic luminescent particles, enhancing their thermal resistance and luminous efficiency, maintaining performance even under exposure to external factors like oxygen, moisture, and high temperatures, and improving the overall luminous properties of light-emitting films and devices.
Implementation Method 1
enhancing thermal resistance by encapsulating inorganic luminescent particles
Implementation Method 2
A polyurethane-based dispersant with a Host-Guest molecular conformation
Implementation Method 3
preventing agglomeration
Implementation Method 4
enhancing thermal resistance by encapsulating inorganic luminescent particles
Data Source
AI summary
The present disclosure relates to a dispersant having the following structure of Chemical Formula 1, a light emitting film in which the dispersant is adsorbed on a surface of an inorganic luminescent particle, and a light emitting diode and a light emitting device in which the light emitting film is applied into an emitting material layer and/or a color conversion film. The dispersant enables the inorganic luminescent particle to have excellent dispersion property and optical properties, and thus the light emitting diode and the light emitting device can its luminous efficiency and luminous lifetime.