Quantum Dot Ink Composition for Bending-Resistant Films
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Solution Overview
Problem
Existing ink compositions for forming quantum dot films are prone to damage when bent and exhibit high visibility of folded parts, which affects their reliability and performance in electronic apparatuses.
Innovation Solution
An ink composition comprising quantum dots with organic ligands, monomers with epoxy and oxetane groups, thiol-containing monomers, and tertiary amine compounds with allylamine groups, which form a crosslinked polyether and polysulfide network structure, enhancing the film's mechanical and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink composition is used for forming quantum dot film, then the film can be formed, but the film is prone to damage when bent and shows high visibility of folded parts
Solution Approach 1:
The patent uses a composite binder system comprising polyether resin and polysulfide resin in combination with specific monomers (epoxy group-containing, oxetane group-containing, and thiol group-containing monomers) to form a crosslinked network structure. This composite material approach creates a film that simultaneously achieves flexibility for bending resistance and optical properties for low folded part visibility, resolving the contradiction between reliability and harmful visual effects.
Solution Approach 2:
The patent optimizes the molecular weight ranges, functional group ratios, and compositional parameters of the binder components to achieve the desired balance between mechanical flexibility and optical transparency. By carefully controlling parameters such as the weight ratio of polyether resin to polysulfide resin and the specific functional group content, the film attains both bending resistance and reduced folded part visibility.
2Strength
If the ink composition forms a flexible film, then bending resistance improves, but the structural integrity may be compromised
Solution Approach 1:
The patent creates different local properties within the binder system: the polyether resin provides flexibility and elasticity, while the polysulfide resin contributes to structural strength and crosslinking. The epoxy and oxetane groups form rigid crosslinked networks, while the thiol groups provide additional bonding points. This local differentiation of material properties within the composite binder enables the film to simultaneously exhibit both flexibility and structural integrity.
Solution Approach 2:
The crosslinked network structure formed by the epoxy and oxetane groups acts as a pre-established protective framework that cushions and distributes mechanical stresses before they can cause damage. This预先形成的交联网络在弯曲应力作用下能够均匀分散应力，防止局部应力集中导致的结构失效，从而在保持柔性的同时维护结构完整性。
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 produces a quantum dot film that is resistant to bending damage and has low visibility of folded parts, improving the mechanical and optical properties and reliability of the film, thus enhancing the performance of electronic apparatuses.
Implementation Method 1
a first monomer containing at least one epoxy group, a second monomer containing at least one oxetane group
Implementation Method 2
a third monomer containing at least one thiol group, and a tertiary amine compound containing at least one allylamine group
Implementation Method 3
a color conversion layer including a color conversion light-emitting material that absorbs light of a specific wavelength and converts the light into light of another wavelength and emits the light
Data Source
AI summary
An ink composition includes: a quantum dot containing at least one organic ligand on a surface thereof; a first monomer containing at least one epoxy group; a second monomer containing at least one oxetane group; a third monomer containing at least one thiol group; and a tertiary amine compound containing at least one allylamine group, where the organic ligand may contain at least one polar moiety. Also, an electronic apparatus including a film prepared from the ink composition is provided.