Quantum Dot Particle Aggregate Core-Shell Structure
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Solution Overview
Problem
Quantum dot-based light conversion devices face issues with low light output efficiency and short lifespan due to high-temperature processing, which damages the quantum dots during granulation in traditional preparation methods.
Innovation Solution
A method involving the mixing of first polymer particles, a first quantum dot solution, and a second polymer solution, followed by drying to form quantum dot particles with a polymer shell, which are then optionally further processed to add additional polymer shells, avoiding high-temperature extrusion granulation and allowing for simpler, cost-effective preparation of quantum dot aggregates for light conversion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dots are mixed with polymer materials and subjected to high-temperature extrusion granulation, then the quantum dot film can be prepared, but the quantum dots are damaged by high temperature causing low light output efficiency and short lifetime
Solution Approach 1:
The patent divides the quantum dot particle into a core (first polymer particle) and shell (second polymer) structure, where the core provides structural support and the shell contains the quantum dots. This segmentation allows the quantum dots to be protected from high-temperature damage while maintaining ease of manufacture through suspension coating and drying processes.
Solution Approach 2:
The patent performs preliminary suspension coating of quantum dots onto first polymer particles before final film formation. This preliminary action allows quantum dots to be pre-positioned and protected on particle surfaces, avoiding direct exposure to high-temperature extrusion granulation that would damage them.
2Productivity
If traditional high-temperature extrusion granulation is used for preparing quantum dot particles, then the preparation process can be completed, but the quantum dots suffer damage leading to poor performance
Solution Approach 1:
The patent replaces the mechanical high-temperature extrusion granulation system with a suspension coating and drying system. Quantum dots are suspended in solution, coated onto polymer particles, and then dried to form the core-shell structure, eliminating the need for high-temperature mechanical processing that damages quantum dots.
Solution Approach 2:
The patent changes the processing parameters from high-temperature extrusion (typically 200°C or higher) to low-temperature suspension coating and drying (below quantum dot damage threshold). This parameter change maintains productivity while preserving quantum dot integrity and luminescence performance.
3Reliability
If quantum dot film with two barrier films is used, then the device structure is established, but the cost is high
Solution Approach 1:
The patent merges the quantum dot layer with the diffusion plate function into a single integrated component. The quantum dot particles are embedded within the polymer matrix of the diffusion plate itself, eliminating the need for separate quantum dot films and barrier films, thereby reducing manufacturing cost while maintaining device reliability.
Solution Approach 2:
The patent creates a multi-functional diffusion plate that simultaneously serves as the structural component, diffusion element, and quantum dot luminescence layer. This universal design consolidates multiple functions into one component, reducing the number of separate layers and barrier films needed, thus lowering manufacturing cost.
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 enhances the lifespan and light output efficiency of quantum dot-based light conversion devices by protecting quantum dots from high-temperature damage and improving the uniformity of luminescent materials, resulting in improved performance and extended product life.
Implementation Method 1
mixing a plurality of first polymer particles, a first quantum dot solution and a second polymer solution, and drying to obtain an aggregate containing a plurality of quantum dot particles A
Data Source
AI summary
The present disclosure provides a quantum dot particle aggregate and a preparation method therefor, a preparation method for a light conversion device, and quantum dot particles. The preparation method for the quantum dot particle aggregate includes: mixing a plurality of first polymer particles, a first quantum dot solution and a second polymer solution, and drying to obtain an aggregate containing a plurality of quantum dot particles A, where each of the quantum dot particles A includes a core of a first polymer particle and a shell of a second polymer formed by the second polymer, a plurality of first quantum dots are positioned in the shell of the second polymer, and the first polymer particle has a minimum dimension greater than or equal to 0.3 mm. The process reduces the damage to quantum dots and can prolong the life time of application products of quantum dots.