To make a quantum dot consisting of a perovskite nanocrystal (left) more efficient, researchers have created special molecules (right) that form a protective layer around the quantum dot. (Illustration: Kovalenko Lab)
To make a quantum dot consisting of a perovskite nanocrystal ( left ) more efficient, researchers have created special molecules ( right ) that form a protective layer around the quantum dot. (Illustration: Kovalenko Lab) Researchers at Empa and ETH have developed methods for making perovskite quantum dots faster and more efficient emitters, thereby significantly improving their brightness. This is relevant for applications in displays as well as in quantum technologies. Quantum dots are a kind of artificial atom: just a few nanometres in size and made of semiconductor materials, they can emit light of a specific colour or even single photons, which is important for quantum technologies. The discoverers and pioneers of the commercial production of quantum dots were awarded the Nobel Prize in Chemistry in 2023. In recent years, quantum dots made of perovskites have attracted particular attention. Perovskites belong to a class of materials that have a similar structure to the mineral perovskite (calcium titanate).Quantum dots made of such materials were produced for the first time by ETH Zurich in 2014.
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