Layered Barrier for Quantum Dot LEDs

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Solution Overview

Problem

Current barrier coatings for quantum dot-polymer composites in light emitting diodes are economically and technologically inferior, and their performance is significantly reduced under harsh conditions such as high temperature and high humidity, leading to instability and reduced luminous efficiency.

Innovation Solution

A layered structure comprising a first layer of a polymerization product from a monomer combination with thiol and ene compounds, and a second layer of inorganic material, which provides enhanced stability and barrier properties when applied to a photoconversion layer with quantum dots, maintaining luminous efficiency even under harsh conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a deposited metal oxide barrier film is used to protect quantum dots, then barrier properties are improved, but manufacturing cost and process complexity increase

Engineering Contradiction:

Improvebarrier propertiesVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the material parameters from inorganic metal oxide to organic polymer composition, and alters the deposition method parameters from vacuum sputtering to solution-based coating, thereby reducing manufacturing cost while maintaining barrier functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces expensive deposited metal oxide barrier films with a cost-effective polymer-based barrier layer that can be applied through simple coating processes, making the barrier protection economically viable for mass production

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If a deposited metal oxide barrier film is used to protect quantum dots, then barrier properties are improved, but device complexity increases

Engineering Contradiction:

Improvebarrier propertiesVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the barrier function from the complex vacuum deposition process and implements it through a simple polymer coating process, eliminating the need for sophisticated deposition equipment and complex process control

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical vacuum deposition system with a chemical solution-based coating system, substituting complex physical vapor deposition with simple liquid application methods that are easier to implement and control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If currently available barrier coating is used, then initial barrier properties are achieved, but performance is greatly reduced under harsh conditions (high temperature and high humidity)

Engineering Contradiction:

Improveinitial barrier propertiesVSAvoidstability under harsh conditions

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses a composite polymer composition containing specific additives and fillers that work synergistically to provide both initial barrier properties and long-term stability under harsh conditions, combining multiple material functions in a single layer

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the barrier layer by incorporating specific polymer matrices and functional additives that enhance thermal and moisture resistance, thereby improving stability under harsh conditions while maintaining barrier effectiveness

Inventive Principle:

Principle #35Parameter changes

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 layered structure effectively protects quantum dots from moisture and oxygen, maintaining high luminous efficiency and color purity, and exhibits improved reliability and stability under high temperature and high humidity conditions, reducing production costs while matching the performance of expensive deposition-type barrier elements.

Implementation Method 1

a first layer including a polymerization product of a monomer combination including a first monomer having at least two thiol groups at its terminal end and a second monomer having at least two carbon-carbon unsaturated bond-containing groups at its terminal end

Methodology Applied

Scientific EffectThiol-ene polymerization: Chemical Bonding

Implementation Method 2

the first layer including a polymerization product of a monomer combination including a first monomer having at least two thiol groups at its terminal end and a second monomer having at least two carbon-carbon unsaturated bond-containing groups at its terminal end

Methodology Applied

Scientific EffectDiffusion barrier: Diffusion Barrier

Data Source

PatentUS10559726B2Layered structures and quantum dot sheets and electronic devices including the same

Publication Date: 2020.02.11 SAMSUNG ELECTRONICS CO LTD

AI summary

A layered structure having a first layer including a polymerization product of a monomer combination including a first monomer having at least two thiol groups at its terminal end and a second monomer having at least two carbon-carbon unsaturated bond-containing groups at its terminal end, wherein the first monomer includes a first thiol compound represented by Chemical Formula 1-1 including a thioglycolate moiety and a second thiol represented by Chemical Formula 1-2, and wherein the second monomer includes an ene compound represented by Chemical Formula 2:wherein in Chemical Formulae 1-1, 1-2, and 2, groups and variables are the same as described in the specification.