Quantum Dot Ink Composition for Oxygen and Moisture Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quantum dots in display devices degrade rapidly due to exposure to oxygen and moisture, leading to decreased luminous efficiency when excited by blue light over time.
Innovation Solution
An ink composition comprising quantum dots, an alkali-insoluble resin, and an alkali-soluble resin, along with specific ethylenically unsaturated monomers and solvents, forms a light conversion layer that provides water vapor and oxygen resistance, enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum dots are exposed to oxygen and moisture environment with blue light irradiation, then the display device can operate and convert light, but the luminous efficiency of quantum dots decreases rapidly
Solution Approach 1:
The patent introduces an intermediary protective layer comprising a first resin and a second resin that acts as a barrier between the quantum dots and the harmful oxygen and moisture environment. The first resin contains specific chemical groups (formula 1) that provide water vapor and oxygen resistance, while the second resin forms a compatible matrix, together protecting the quantum dots from degradation while allowing light conversion function to operate
Solution Approach 2:
The patent employs a composite material system consisting of quantum dots dispersed in a dual-resin matrix (first resin with water vapor and oxygen resistance + second resin for compatibility). This composite structure combines the protective properties of the resin system with the light conversion properties of quantum dots, creating a stable light conversion layer that resists environmental degradation
2Reliability
If a protective layer is added to protect quantum dots from oxygen and moisture, then water vapor and oxygen resistance improves, but the complexity of the ink composition increases
Solution Approach 1:
The patent merges the protective function and the binding function into a single dual-resin system. The first resin provides water vapor and oxygen resistance while the second resin ensures compatibility with quantum dots, and together they form an integrated protective matrix that eliminates the need for separate protective layers, thus managing complexity
3Duration of action of stationary object
If the light conversion layer is protected from environmental factors, then the duration of action improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent incorporates protective resin components directly into the ink composition before the light conversion layer is formed. This preliminary inclusion of protective agents (first resin and second resin) in the ink formulation ensures that protection is built-in from the start, eliminating the need for subsequent protective coating steps and simplifying the manufacturing process
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 ink composition effectively protects quantum dots from water vapor and oxygen, maintaining better dispersibility and improving luminous efficiency, thereby enhancing light resistance and weather resistance of the quantum dot light conversion layer.
Implementation Method 1
The first resin (B1) includes a compound represented by the following formula (1)... The first resin (B1) can be cross-linked by heating and ring-opening to achieve the effect of blocking water vapor and oxygen
Implementation Method 2
a light conversion layer containing quantum dots is disposed in the display device... the quantum dot light conversion layer formed by the ink composition has good water vapor and oxygen resistance properties to improve luminous efficiency
Data Source
AI summary
An ink composition, a light conversion layer and a light emitting device are provided. The resin composition includes a quantum dot (A), a first resin (B1), a second resin (B2), an ethylenically unsaturated monomer (C), an initiator (D) and a solvent (E). The first resin (B1) is an alkali-insoluble resin, and the second resin (B2) is an alkali-soluble resin. The first resin (B1) includes a compound represented by the following Formula (1):In Formula (1), n is an integer from 1 to 10, X is benzene, toluene or naphthalene, and Y is toluene, methylnaphthalene, tetrahydrodicyclopentadiene, or 4,4′-dimethyl-1,1′-biphenyl.