Solid Polymer Composition for Luminescent Crystals
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Solution Overview
Problem
Luminescent crystals, particularly quantum dots, integrated into polymer composites for light-emitting devices face issues with thermal instability, limiting their application in display technologies due to degradation when excited by background lighting.
Innovation Solution
A solid polymer composition comprising luminescent crystals, surfactants, and a hardened/cured polymer, where the luminescent crystals are selected from specific compounds of formula (I) and embedded in a polymer matrix to enhance thermal stability and optical properties, allowing for controlled emission of light in response to excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If luminescent crystals are integrated into polymer composites for light-emitting devices, then optical properties and light emission efficiency are improved, but thermal stability deteriorates causing degradation when excited by background lighting
Solution Approach 1:
The patent uses a composite material system consisting of luminescent crystals (quantum dots) embedded in a polymer matrix. This composite structure allows the luminescent crystals to provide high light emission efficiency while the polymer matrix provides thermal stability and structural support, resolving the contradiction between optical performance and thermal stability
Solution Approach 2:
The patent modifies the polymer matrix composition and crosslinking density to enhance thermal stability. By changing the chemical parameters of the polymer system (using specific monomers, crosslinkers, and ratios), the material maintains its structural integrity at elevated temperatures while preserving the luminescent properties of the embedded crystals
2Illumination intensity
If luminescent crystals are used in light emitting devices, then brightness and optical performance are improved, but reliability deteriorates due to degradation under excitation
Solution Approach 1:
The polymer matrix acts as an intermediary between the luminescent crystals and the external environment. It protects the crystals from degradation caused by oxygen, moisture, and mechanical stress while allowing optical excitation and emission to occur efficiently, thereby maintaining both brightness and reliability
Solution Approach 2:
The patent employs a polymer encapsulation strategy that creates a protective barrier around the luminescent crystals. This encapsulation layer is designed to be stable under operating conditions, preventing crystal degradation and extending device lifetime without interfering with optical performance
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 provides a thermally stable and efficient light-emitting component with improved photoluminescence quantum yield and sharp wavelength distributions, enabling effective use in display technologies while maintaining RoHS compliance.
Implementation Method 1
The luminescent crystals of the first solid polymer composition emit light of a first wavelength in response to excitation by light with a wavelength shorter than the first wavelength
Data Source
AI summary
The present invention relates in a first aspect to a solid polymer component comprising luminescent crystals of 3-500 nm size, surfactant and a hardened/cured polymer. In a second aspect of the invention, a luminescent component comprises a first element comprising the solid polymer component according to the first aspect and an encapsulation enclosing the first element. In a third aspect of the invention, a luminescent component comprises a first film comprising the solid polymer composition of the first aspect. A fourth aspect of the invention relates to a light emitting device comprising the luminescent component according to the second or third aspect of the invention and a light source.