Published in the journal Nanoscale, their work introduces a direct method for forming perovskite nanocrystal assemblies. This research simplifies the complex multi-step process required to create these structures.
Professor Jacek Jasieniak, senior author on the paper, said: "This research marks a notable shift in the synthesis of perovskite assemblies. Typically, achieving such assemblies necessitates several processing steps.
“Our work demonstrates that, by carefully controlling reaction conditions these assemblies can form directly within the reaction vessel."
This streamlined approach involves the synthesis of larger structures, or supercrystals, from perovskite nanocrystals. These supercrystals are approximately 1 micron in size, built from 10 nanometer-sized blocks, and are created through a modified hot-injection method.
By adjusting variables such as solvent types, ligands, and the stoichiometry of the reaction, the researchers have managed to enhance the hydrophobic interactions between the nanocrystals, prompting them to assemble into supercrystals.
A key feature of these supercrystals is their red-shifted photoluminescence, which allows them to emit a wider spectrum of colours. This property holds promise for the development of more vibrant and efficient light-emitting devices, from LEDs to advanced display technologies.
This work represents not just an advancement in the understanding and manipulation of perovskite nanocrystals but also opens up new possibilities for their application in various technologies. The ability to directly synthesize these supercrystals simplifies the production process, potentially making it more accessible for industrial applications.
The efforts of the Exciton Science team represent a promising contribution to the field of optoelectronics, hinting at a more colourful and efficient future for light-based technologies.