Quantum Dot Electrospun Film for Uniform Dispersion
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Solution Overview
Problem
Existing methods for forming large-scale quantum dot films, such as casting and spin coating, face challenges with uniform dispersion and light efficiency due to agglomeration and increased film thickness, limiting their commercialization and scalability.
Innovation Solution
The method involves forming quantum dots or dyes into fibers or beads through electrospinning and applying them to an adhesive film with pressure, followed by curing, which enhances light efficiency and conversion efficiency by preventing agglomeration and allowing for back reflection of light, and can include a core-shell structure for controlling barrier properties and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (casting, spin coating, doctor blade, painting, spray coating) are used to form large scale quantum dot films, then film formation is achieved, but uniform dispersion is poor and film thickness increases due to agglomeration and additional barrier layers
Solution Approach 1:
The patent segments the quantum dot film into a hierarchical structure with nanofibers as the base matrix and nanobeads dispersed within them. This segmentation prevents agglomeration by distributing quantum dots throughout the fiber network, achieving uniform dispersion without requiring additional barrier coating processes.
Solution Approach 2:
The patent creates a composite material system combining electrospun nanofibers containing quantum dots with dispersed nanobeads. This composite structure inherently provides both the film matrix and uniform quantum dot distribution, eliminating the need for separate barrier layers while maintaining film integrity.
2Use of energy by moving object
If electrospinning is used to form quantum dot films, then light efficiency and conversion efficiency are improved through uniform dispersion and internal reflection, but productivity is low and large scale production is limited
Solution Approach 1:
The patent merges multiple electrospinning processes into a single integrated step that simultaneously forms nanofibers and disperses nanobeads containing quantum dots. This combined approach maintains the high light efficiency benefits of electrospinning while enabling larger scale production through continuous processing.
Solution Approach 2:
The patent implements continuous electrospinning processes that can operate for extended periods to produce large area films. The method maintains continuous fiber formation and bead dispersion throughout the process, enabling scalable production while preserving the optical properties that provide high light efficiency.
3Reliability
If additional barrier and light diffusion layers are added to conventional quantum dot films, then film stability is improved, but film thickness increases and light conversion efficiency decreases
Solution Approach 1:
The patent incorporates barrier and stabilizing functions directly into the nanofiber matrix at the local level where quantum dots are embedded. The nanofiber material itself provides the necessary stability and protection, eliminating the need for separate thick barrier layers while maintaining film integrity and preventing quantum dot degradation.
4Area of stationary object
If quantum dots are dispersed in conventional film formation methods, then film coverage is achieved, but agglomeration occurs reducing light efficiency
Solution Approach 1:
The patent transitions from two-dimensional quantum dot dispersion in conventional films to a three-dimensional hierarchical structure where nanobeads are distributed within nanofibers. This dimensional change from planar dispersion to volumetric distribution prevents agglomeration while achieving complete area coverage, as the fiber network extends throughout the entire film volume.
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
This approach results in a uniformly dispersed quantum dot film with increased light efficiency and conversion efficiency, enabling mass production and application in LEDs, OLEDs, and other devices while maintaining stability against heat and moisture.
Implementation Method 1
fibers or beads of quantum dots or a dye which are prepared by electrospinning
Implementation Method 2
applying pressure to an adhesive film to make the fibers or the beads adhere thereto
Implementation Method 3
curing the adhesive film onto which the fibers or the beads have adhered
Implementation Method 4
the quantum dots or the dye is formed into fibers or beads to induce back reflection of light
Data Source
AI summary
The present disclosure relates to a large scale film containing quantum dots or a dye, a method of preparing the large scale film, including: forming quantum dots or a dye dispersed in a solvent in the form of fibers or beads; applying pressure to an adhesive film to make the fibers or the beads adhere thereto; and curing the adhesive film onto which the fibers or the beads have adhered, and fibers or beads of quantum dots or a dye which are prepared by electrospinning.