Method for preparing fluorescent nanomaterial-polymer composite, and light emitting device

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Solution Overview

Problem

Fluorescent nanomaterials used in display and illumination applications are prone to instability due to damage from oxygen and water vapor, leading to poor performance in wavelength conversion elements.

Innovation Solution

A method involving mixing fluorescent nanomaterials with a polymer at a temperature higher than the polymer's melting point, followed by cooling, to create a stable fluorescent nanomaterial-polymer composite, which is then formed into a wavelength converting element with enhanced stability and resistance to environmental factors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If fluorescent nanomaterials are dispersed in polymer using conventional methods, then the preparation process is simple, but the stability of fluorescent nanomaterials deteriorates due to damage from oxygen and water vapor

Engineering Contradiction:

Improvepreparation process simplicityVSAvoidstability of fluorescent nanomaterials

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs an inert atmosphere (nitrogen or argon) throughout the preparation process to exclude oxygen and water vapor. The fluorescent nanomaterials are mixed with the polymer in a molten state under inert gas protection, and the resulting composite is sealed in a hermetic structure, creating a protected environment that prevents oxidation and hydrolysis of the nanomaterials while maintaining simple preparation procedures

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent creates a composite material system where fluorescent nanomaterials are embedded within a polymer matrix under inert conditions. This composite structure provides both the functional properties of the nanomaterials and the protective encapsulation of the polymer, while the hermetic sealing adds a third layer of protection against environmental factors

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If fluorescent nanomaterials are exposed to external environment, then the preparation process is straightforward, but the service life deteriorates due to oxidation and hydrolysis

Engineering Contradiction:

Improvepreparation straightforwardnessVSAvoidservice life of wavelength converting element

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The patent maintains an inert atmosphere during the entire preparation and sealing process, ensuring that fluorescent nanomaterials never come into contact with oxygen or water vapor. The hermetic sealing encapsulates the composite in a permanent protective barrier, extending service life while keeping the preparation process straightforward

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent performs preliminary protection by sealing the fluorescent nanomaterial-polymer composite in a hermetic structure immediately after preparation, before any environmental damage can occur. This preliminary encapsulation prevents subsequent oxidation and hydrolysis, extending service life without complicating the overall manufacturing process

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If fluorescent nanomaterial-polymer composite is not hermetically sealed, then the manufacturing process is simpler, but the resistance to environmental factors deteriorates

Engineering Contradiction:

Improvestructure complexityVSAvoidresistance to oxygen and water vapor

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent uses inert atmosphere filling combined with hermetic sealing to create a permanently protected internal environment. The sealing structure, while adding some complexity, provides robust protection against oxygen and water vapor penetration, significantly improving resistance to environmental factors

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent employs thin film sealing structures (such as metal or ceramic coatings) to hermetically seal the fluorescent nanomaterial-polymer composite. These thin film barriers provide effective protection against environmental factors while minimizing the increase in overall device complexity

Inventive Principle:

Principle #30Flexible shells and thin films

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 method significantly improves the service life and stability of the fluorescent nanomaterial-polymer composite, maintaining brightness over time even in harsh conditions, making it suitable for various application scenarios.

Implementation Method 1

in a first temperature at or higher than a melting point of the polymer, the precursor is mixed, and then cooled

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 2

in a first temperature at or higher than a melting point of the polymer, the precursor is mixed, and then cooled

Methodology Applied

Scientific EffectPhase change: Phase Change

Data Source

PatentUS11873437B2Method for preparing fluorescent nanomaterial-polymer composite, and light emitting device

Publication Date: 2024.01.16 SUZHOU XINGSHUO NANOTECH CO LTD

AI summary

Disclosed are a method for preparing a fluorescent nanomaterial-polymer composite and a wavelength converting element, and a light emitting device. The method for preparing the fluorescent nanomaterial-polymer composite includes: at least one precursor provided, the precursor includes a fluorescent nanomaterial and a polymer; and in a first temperature at or higher than a melting point of the polymer, the precursor is mixed, and then cooled.