Silica Composite Microparticles for Barrier-Free Quantum Dot Films

Solution Overview

Problem

Quantum Dot Enhancement Films (QDEF) require barrier layers for stability, which increase costs due to their necessity in maintaining operational conditions, and there is a need for films with improved stability without these layers.

Innovation Solution

Silica composite microparticles containing nanostructures are embedded in optical grade polymer films, eliminating the need for barrier layers by providing stability through the use of silica microparticles with nanostructures like InP or CdSe cores and ZnSe/ZnS shells, which are embedded via extrusion processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If barrier layers are added to QDEF to provide stability under operating conditions, then reliability is improved, but device complexity and cost increase

Engineering Contradiction:

ImprovestabilityVSAvoidstructure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the barrier layer function and the quantum dot enhancement film function into a single integrated structure. The silica microparticles containing nanostructures are embedded directly in the polymer resin, eliminating the need for separate barrier layers while providing both stability and quantum dot enhancement functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses composite materials by embedding silica microparticles containing quantum dot nanostructures within a polymer resin matrix. This composite structure provides the mechanical properties needed for film stability while the silica encapsulation protects the quantum dots, eliminating the need for additional barrier layers.

Inventive Principle:

Principle #40Composite materials

2Reliability

If barrier layers are added to QDEF to maintain operational conditions, then reliability is improved, but manufacturing cost increases

Engineering Contradiction:

ImprovestabilityVSAvoidcost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines the barrier layer function and the quantum dot enhancement film function into a single integrated structure. The silica microparticles containing nanostructures are embedded directly in the polymer resin, eliminating the need for separate barrier layers while providing both stability and quantum dot enhancement functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent extracts the barrier layer as a separate component and eliminates it by integrating its protective function directly into the film structure through silica-encapsulated quantum dots embedded in the polymer resin.

Inventive Principle:

Principle #2Taking out (Extraction)

3Device complexity

If silica microparticles with nanostructures are embedded in polymer films to eliminate barrier layers, then device complexity is reduced, but stability under operating conditions must be maintained

Engineering Contradiction:

ImprovestructureVSAvoidstability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent uses composite materials by embedding silica microparticles containing quantum dot nanostructures within a polymer resin matrix. This composite structure provides the mechanical properties needed for film stability while the silica encapsulation protects the quantum dots, eliminating the need for additional barrier layers.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by providing targeted protection to the quantum dots through silica encapsulation at the nanoparticle level, while the bulk polymer resin provides the overall film structure and stability. This localized approach to protection eliminates the need for global barrier layers.

Inventive Principle:

Principle #3Local quality

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 reduces costs by eliminating barrier layers while maintaining film stability, ensuring high emission power retention under various operating conditions, including high flux, temperature, and humidity, thus enhancing the efficiency and cost-effectiveness of display devices.

Implementation Method 1

the nanostructures are embedded in silica microparticles

Methodology Applied

Scientific EffectEncapsulation:

Implementation Method 2

adding the admixture obtained in (a) to a solution comprising a nonionic surfactant in a nonpolar aprotic solvent and mixing to give a first microemulsion

Methodology Applied

Scientific EffectMicroemulsion: Microemulsion

Implementation Method 3

admixing acetic acid, a nonionic surfactant and a nonpolar aprotic solvent to give a second microemulsion; and admixing the first and second microemulsions to give silica microparticles comprising the nanostructures

Methodology Applied

Scientific EffectPrecipitation: Precipitation

Implementation Method 4

Quantum Dot Enhancement films (QDEF) are multilayer structures consisting of a nanostructure embedded in a polymer resin

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS20250215309A1Silica composite microparticles comprising nanostructures

Publication Date: 2025.07.03 SHOEI CHEM IND CO LTD

AI summary

The present invention is in the field of nanostructures. Provided herein are microparticles comprising nanostructures and silica. Also provided herein are methods of preparing the microparticles, films comprising the microparticles, and devices comprising the microparticles. Also provided herein are display backlighting units (BLUs) that do not comprise a barrier layer.