Engineers have created a “minifactory” for the production of quantum dots of the entire spectrum
Posted On March 23, 2021
What are Quantum Dots?
Researchers have developed a microfluidic system for synthesizing perovskite quantum dots across the entire spectrum of visible light. It can be configured to produce nanocrystals of any color and can be fully monitored in real time for quality control and significant cost savings.
Over the past 20 years, colloidal semiconductor nanocrystals, called quantum dots (QDs), have become widespread in LED displays, solar energy collection devices, bio-sensing, and other fields. A team of scientists from North Carolina State University has created a fully automated continuous production system that operates at room temperature.
The engineers themselves call their microfluidic platform the nanocrystal factory. The system consists of three modules responsible for premixing halide salts and quantum dots, controlling the reaction rate and monitoring the process. The ability to accurately control the chemical composition and processing parameters allows you to achieve manufacturing high-quality CT perovskite of any color.
Cesium-lead bromide nanocrystals with green emission are initially synthesized, and then various halide salts are added to fine-tune their fluorescence characteristics across the entire spectrum of visible light. Negatively charged ions the salts introduced replace bromine atoms with iodine (moving towards the red edge) or chlorine (towards blue).
According to scientists, the developed technology will ensure an increase in production efficiency and practical application of the products obtained. As an example, they point to attractiveness of perovskite quantum dots for solar energy. Despite their high efficiency rates, their production is still too expensive for global use. Moreover, more than 60% of expenses are associated with production.
According to preliminary estimates, the created microfluidic platform will reduce overall production costs by at least half. At the same time, continuous quality control will allow you to quickly make adjustments as needed in order to exclude deviations in different batches..
The team has already submitted a patent application and is looking for partners who will help commercialize the developed synthesis technology.
The direction is very promising, since recently scientists from Stanford University found that the radiation efficiency of QDs can exceed 99.9% even when using cheap semiconductors.
We also previously reported that scientists have made a breakthrough in the production of nanochips..
text: Ilya Bauer, photo: Unsplash, North Carolina State University