Light Scattering Sheet with Recrystallized Quantum Dots
Solution Overview
Problem
Existing light scattering technologies for quantum dot-based lighting devices face challenges in achieving uniform distribution and stability of quantum dots, leading to inefficient light scattering and agglomeration issues.
Innovation Solution
A light scattering sheet with a light conversion layer comprising quantum dots uniformly dispersed within a polymer crystal domain, where the quantum dots are recrystallized between polymer chains, reducing agglomeration and enhancing stability, and the polymer's crystallinity ensures efficient light scattering without the need for additional light scattering layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are dispersed in a polymer matrix, then light scattering performance is improved, but quantum dots tend to agglomerate and distribution uniformity deteriorates
Solution Approach 1:
The polymer is segmented into crystalline domains and amorphous domains, with quantum dots preferentially located in the amorphous regions. This segmentation prevents quantum dot agglomeration by providing isolated dispersion sites while maintaining high light scattering performance through the crystalline structure.
Solution Approach 2:
Different regions of the polymer have different properties: crystalline domains provide structural stability and light scattering, while amorphous domains provide spaces for uniform quantum dot dispersion. This local differentiation resolves the contradiction between light scattering performance and distribution uniformity.
2Illumination intensity
If additional light scattering layers are added to enhance light scattering, then light scattering performance is improved, but device complexity increases
Solution Approach 1:
The light scattering function and quantum dot dispersion function are merged into a single polymer composite material. The crystalline polymer provides light scattering while the amorphous regions accommodate quantum dots, eliminating the need for separate light scattering layers and reducing device complexity.
Solution Approach 2:
The polymer composite serves multiple functions simultaneously: it acts as a light scattering medium, a quantum dot carrier, and a structural support. This multi-functionality replaces what would traditionally require multiple separate components, simplifying the overall device structure.
3Use of energy by moving object
If quantum dots are densely packed to improve light conversion, then light efficiency is improved, but heat transfer increases causing stability issues
Solution Approach 1:
The polymer matrix acts as an intermediary between quantum dots, providing thermal isolation while maintaining optical coupling. This allows quantum dots to be densely packed for high light efficiency while the polymer matrix prevents direct heat transfer between them, maintaining stability.
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 achieves improved light efficiency, reduced agglomeration, and enhanced stability of quantum dots, maintaining high light scattering performance even without additional light scattering layers, while minimizing direct heat transfer and ensuring stability to environmental changes.
Implementation Method 1
a particle of the present specification converts a wavelength of incident light to generate light having a converted wavelength
Implementation Method 2
scatter light
Implementation Method 3
the quantum dots are recrystallized between polymer chains
Data Source
Figure 1~1(c)
Figure 2
Figure 3
AI summary
Provided are a light scattering sheet, an electronic device comprising the same, and a method of manufacturing the same.