Quantum Dot Optical Films Adhesion Stability

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Solution Overview

Problem

Current quantum dot-containing materials face challenges in achieving optimal adhesion and stability within polymer matrices, particularly in optical films, due to issues with free volume parameters and the integration of quantum dots with adhesion promoters and other components.

Innovation Solution

A pre-polymer formulation comprising quantum dots and a cyclohexylacrylate monomer with a free volume parameter less than or equal to 0.03 cm3/g, along with additional components like adhesion promoters, scatterers, and cross-linking agents, is used to create a quantum dot composition that is dispersed in a polymer matrix, enhancing adhesion and stability within optical films.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If quantum dots are integrated into polymer matrices with conventional free volume parameters, then the quantum dot composition can be formed, but adhesion and stability are insufficient

Engineering Contradiction:

Improveadhesion and stabilityVSAvoidintegration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by specifically selecting polymer precursors with controlled free volume parameters (VFH2/γ ≤ 0.03 cm³/g) to optimize the polymer matrix properties. This parameter control enables improved adhesion and stability of quantum dots within the matrix while maintaining manufacturability through UV-curable formulations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining quantum dots with UV-curable polymer matrices containing specific precursors (acrylates, methacrylates, vinyl monomers). This composite approach integrates multiple components (quantum dots, polymer precursors, photoinitiators, adhesion promoters) to achieve enhanced adhesion and stability while maintaining processability.

Inventive Principle:

Principle #40Composite materials

2Productivity

If quantum dot composition is cured efficiently, then production time is reduced, but maintaining adhesion and stability becomes challenging

Engineering Contradiction:

Improvecuring efficiencyVSAvoidadhesion and stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent utilizes phase transitions through UV photopolymerization, where UV-curable polymer precursors transition from liquid monomer/oligomer state to solid cross-linked polymer network. This rapid phase transition enables efficient curing while the cross-linked structure maintains adhesion and stability of the quantum dot composition.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The patent replaces traditional thermal curing mechanisms with UV photopolymerization. This substitution allows rapid curing through light activation rather than prolonged heating, improving productivity while the photopolymerized cross-linked structure ensures maintained adhesion and stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If polymer matrix with low free volume parameter is used, then adhesion is improved, but selection and formulation becomes more complex

Engineering Contradiction:

ImproveadhesionVSAvoidformulation ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs UV-curable polymer precursors (acrylates, methacrylates, vinyl monomers) that serve multiple functions: they provide the required low free volume parameters for adhesion, offer UV-curability for efficient curing, and can be formulated with photoinitiators and adhesion promoters. This multi-functionality simplifies the overall formulation process despite the specific parameter requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 results in improved adhesion and reduced edge ingress in optical films, maintaining luminance and optical properties over time, while allowing for efficient curing and integration of quantum dots within the polymer matrix.

Implementation Method 1

a quantum dot-containing layer disposed between the first and second substrates, the quantum dot-containing layer including a quantum dot composition

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

a pre-polymer formulation comprising quantum dots and a precursor for a polymer having a free volume parameter VFH2/γ with a value less than or equal to 0.03 cm3/g

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentUS11060022B2Quantum dot-containing materials and products including same cross reference to related applications

Publication Date: 2021.07.13 SAMSUNG ELECTRONICS CO LTD

AI summary

A pre-polymer formulation comprising quantum dots and a precursor for a polymer having a free volume parameter VFH2/γ with a value less than or equal to 0.03 cm3/g is disclosed. A pre-polymer formulation comprising quantum dots and a cyclohexylacrylate monomer is further disclosed. Also disclosed are a quantum dot composition including quantum dots dispersed in a polymer matrix, the quantum dot composition being prepared from a pre-polymer formulation comprising quantum dots and a precursor for a polymer having a free volume parameter VFH2/γ with a value less than or equal to cm3/g; a method; and other products including a quantum dot composition described herein.