Solid Polymer Composition for Luminescent Crystal Embedding

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Solution Overview

Problem

State-of-the-art liquid crystal displays face challenges in embedding luminescent crystals due to incompatibilities between materials, leading to degradation and reduced lifetime, particularly with the use of quantum dots in backlight components.

Innovation Solution

A solid polymer composition comprising green luminescent perovskite crystals and non-perovskite red phosphor particles, embedded without encapsulation, within a polymer matrix that provides stability, eliminating the need for inorganic protection layers and simplifying manufacturing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If luminescent crystals are embedded into display components, then the display achieves required luminescent function, but material incompatibility leads to degradation and reduced lifetime

Engineering Contradiction:

Improvedisplay lifetimeVSAvoidmaterial incompatibility degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an organic polymer matrix as an intermediary material that chemically compatibly embeds both perovskite quantum dots and non-perovskite phosphors. This polymer mediator prevents direct harmful interactions between the different luminescent materials, thereby resolving the material incompatibility issue while maintaining luminescent function and improving display lifetime.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite material system consisting of the polymer matrix combined with multiple types of luminescent crystals (perovskite QDs and non-perovskite phosphors). This composite structure allows different materials to coexist without degradation, solving the incompatibility problem while achieving the required luminescent properties.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If inorganic protection layers are used to protect luminescent crystals, then stability is improved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveluminescent crystal stabilityVSAvoidstructure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent removes the separate inorganic protection layer from the structure by integrating the protective function directly into the organic polymer matrix. The polymer simultaneously serves as both the embedding medium and the protective environment for the luminescent crystals, eliminating the need for additional protection layers and simplifying the overall device structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The organic polymer matrix performs multiple functions simultaneously: it embeds the luminescent crystals, provides chemical compatibility, offers protection against degradation, and maintains structural integrity. This multi-functional material replaces what would traditionally require multiple separate components, reducing device complexity while improving stability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If multiple luminescent materials with different chemical properties are used, then color gamut is improved, but chemical incompatibility between materials occurs

Engineering Contradiction:

Improvecolor gamutVSAvoidchemical incompatibility

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent creates a locally optimized chemical environment within the polymer matrix that is specifically suited for accommodating different types of luminescent materials. The polymer's chemical properties are tailored to be compatible with both perovskite quantum dots and non-perovskite phosphors, allowing each material to maintain its luminescent properties without chemical degradation, thus achieving wide color gamut without incompatibility.

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 composition achieves high stability and luminescent efficiency for green and red light emission, enhancing the longevity and performance of light-emitting devices like LCDs by ensuring chemical compatibility and reducing degradation from environmental factors.

Implementation Method 1

green luminescent perovskite crystals, non-perovskite red phosphor particles

Methodology Applied

Scientific EffectLuminescence: Luminescence

Implementation Method 2

luminescent efficiency for green and red light emission

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS20220396730A1Solid polymer composition, a self-supporting film and a light emitting device

Publication Date: 2022.12.15 AVANTAMA AG

AI summary

The invention refers in a first aspect to a solid polymer composition (100) comprising green luminescent crystals (1), non-perovskite red phosphor particles, and a polymer (3). The polymer (3) has a molar ratio of the sum of (oxygen+nitrogen) to carbon z, wherein z≤0.9, z≤0.75 in particular z≤0.4, in particular z≤0.3, in particular z≤0.25. A second aspect of the invention refers to a self-supporting film comprising the solid polymer composition (100) of the first aspect. A third aspect of the invention refers to a light emitting device comprising either the solid polymer composition (100) according to the first aspect of the invention or the self-supporting film according to the second aspect of the invention.