Solid Polymer Composition for Stable Green and Red Luminescence

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Solution Overview

Problem

Existing luminescent crystal-based display components face challenges with material incompatibilities leading to degradation and instability, affecting their lifetime and brightness.

Innovation Solution

A solid polymer composition comprising green and red luminescent perovskite crystals, encapsulated in a polymer matrix with barrier layers, which enhances stability and brightness by reducing exposure to oxygen and humidity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If luminescent crystals are embedded in display components, then brightness and color emission are achieved, but material incompatibilities cause degradation and reduced lifetime

Engineering Contradiction:

ImprovebrightnessVSAvoidlifetime

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

A polymer matrix is introduced as an intermediary material to embed and protect luminescent crystals. The polymer acts as a compatible host that prevents direct contact between incompatible crystal materials, thereby reducing degradation while maintaining brightness emission.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The polymer matrix creates an inert protective environment around luminescent crystals, isolating them from harmful external factors such as oxygen and moisture. This inert encapsulation prevents chemical degradation and extends the operational lifetime of the display components.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Ease of manufacture

If luminescent crystals are exposed to oxygen and humidity, then manufacturing simplicity is maintained, but stability and brightness deteriorate

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidstability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

A polymer encapsulation layer is applied as a flexible protective shell around luminescent crystals. This thin film barrier prevents oxygen and humidity penetration while maintaining manufacturing simplicity through conventional coating and curing processes.

Inventive Principle:

Principle #30Flexible shells and thin films

3Stability of the object's composition

If barrier layers are added to protect luminescent crystals, then stability under humidity and oxygen exposure is improved, but device complexity increases

Engineering Contradiction:

ImprovestabilityVSAvoidstructure complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The protective barrier function is merged with the polymer matrix that already serves as the embedding medium for luminescent crystals. This combination eliminates the need for separate barrier layers, maintaining stability while avoiding additional structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

4Object-affected harmful factors

If polymer encapsulation is used to protect luminescent crystals, then resistance to oxygen and humidity is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveprotection against degradationVSAvoidencapsulation precision

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The polymer matrix performs self-encapsulation of luminescent crystals during the manufacturing process. The polymer spontaneously forms a protective shell around each crystal without requiring precise external positioning or complex encapsulation steps, thereby reducing manufacturing precision requirements while maintaining protection against oxygen and humidity.

Inventive Principle:

Principle #25Self-service

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 improves the stability and brightness of luminescent crystals, maintaining consistent color coordinates and efficiency under high blue flux and humidity conditions.

Implementation Method 1

Methodology Applied

Scientific EffectEncapsulation: Physical Containment

Implementation Method 2

The green luminescent crystals are of size between 3 nm and 3000 nm, and emit green light in response to excitation by light with a shorter wavelength

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS12448565B2Solid polymer composition, a self-supporting film and a light emitting device

Publication Date: 2025.10.21 AVANTAMA AG

AI summary

The invention refers in a first aspect to self-supporting film comprising green luminescent crystals (1), red luminescent crystals (2), and a polymer (3). The green luminescent crystals (1) are perovskite crystals. The red luminescent crystals (2) are zincblende or wurzite, preferably zincblende, crystals. A second aspect of the invention refers to a solid polymer composition (100). A third aspect of the invention refers to a light emitting device comprising either the solid polymer composition (100) or the self-supporting film.