Quantum Dot Cladding for Water and Oxygen Barrier

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Solution Overview

Problem

Quantum dot materials face instability due to water and oxygen exposure, leading to fluorescence quenching, which existing cladding methods fail to adequately address, especially when using atomic layer deposition alone, resulting in incomplete coverage and reduced water and oxygen barrier properties.

Innovation Solution

A two-step method involving a first cladding layer made of materials like SiO2, followed by a second cladding layer using atomic layer deposition, provides a compact and effective barrier against water and oxygen, ensuring the quantum dot's stability by forming a complete and continuous inorganic cladding layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single cladding layer (either organic or inorganic) is used to protect quantum dots, then the water and oxygen barrier properties are improved to some extent, but the compactness and completeness of the cladding layer are insufficient, leading to partial exposure of quantum dots and reduced protection effectiveness

Engineering Contradiction:

Improvewater and oxygen barrier propertiesVSAvoidcompactness of cladding layer

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The cladding structure is divided into multiple independent layers: an organic polymer cladding layer and an inorganic cladding layer. Each layer provides different protective functions, and their combination achieves complete coverage and compact protection, solving the problem of insufficient protection from a single cladding layer.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite cladding structure combining organic polymer materials and inorganic materials. The organic layer provides baseline protection and the inorganic layer provides enhanced barrier properties, creating a synergistic effect that overcomes the limitations of using either material alone.

Inventive Principle:

Principle #40Composite materials

2Reliability

If atomic layer deposition (ALD) technology is used directly to clad pure quantum dots, then the water and oxygen barrier properties are improved, but the carrier gas precursor cannot effectively combine with the ligand on the quantum dot surface, resulting in incomplete cladding and reduced protection

Engineering Contradiction:

Improvewater and oxygen barrier propertiesVSAvoidcompleteness of cladding coverage

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The organic polymer cladding layer is deposited first as a preliminary step before applying the inorganic cladding layer via ALD. This preliminary organic layer provides a surface that facilitates effective combination with the ALD precursor, ensuring complete and uniform inorganic cladding coverage on the quantum dot surface.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The organic polymer cladding layer acts as an intermediary between the quantum dot surface and the inorganic cladding layer. It mediates the interaction by providing a suitable surface for ALD precursor deposition, enabling complete and effective inorganic cladding that would not be achieved directly on the quantum dot surface.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 two-step method significantly enhances the water and oxygen barrier properties of quantum dots, improving their stability and maintaining light conversion efficiency above 80% even after 1000 hours of continuous lighting under high-intensity blue light.

Implementation Method 1

select an appropriate material to block water and oxygen

Methodology Applied

Scientific EffectPhysical barrier:

Implementation Method 2

the water and oxygen barrier properties of the organic polymer

Methodology Applied

Scientific EffectWater and oxygen barrier properties:

Implementation Method 3

An atomic layer deposition (ALD) technology for cladding the quantum dot

Methodology Applied

Scientific EffectAtomic layer deposition:

Implementation Method 4

implemented by dissociating and aggregating a precursor of a cladding layer on the surface of the quantum dot

Methodology Applied

Scientific EffectDissociation and aggregation:

Implementation Method 5

quantum dot fluorescent material emits white light based on blue light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS11535796B2Quantum dot material, and preparation method and use thereof

Publication Date: 2022.12.27 SHENZHEN PLANCK INNOVATION TECH CO LTD

AI summary

Provided are a quantum dot material, a preparation method and use thereof. The quantum material includes a quantum dot, and a first cladding layer and a second cladding clad outside of the quantum dot, wherein the first cladding layer is located between the quantum dot and the second cladding layer. The quantum dot material provided herein has good water and oxygen barrier properties and good stability.