Stockholm: The Nobel Prize in chemistry has been awarded to Moungi Bawendi, Louis Brus and Alexei Ekimov for their work on tiny quantum dots.

Quantum dots are tiny particles, just a few atoms in diameter, whose electrons have constrained movement. This effects how they absorb and release visible light, allowing for very bright colours. They are used in many electronics, like LED displays.

These tiny particles have unique properties and now spread their light from television screens and LED lamps. They catalyse chemical reactions and their clear light can illuminate tumour tissue for a surgeon, according to the Royal Swedish Academy of Sciences.

Hans Ellegren, the secretary-general of the academy, announced the award Wednesday in Stockholm.

The Nobel Prizes carry a cash award of 11 million Swedish kronor ($1 million). The money comes from a bequest left by the prize's creator, Swedish inventor Alfred Nobel, who died in 1896.

The Royal Swedish Academy of Sciences, which awards the physics, chemistry and economics prizes, asks for nominations a year in advance from thousands of university professors and other scholars around the world.

A committee for each prize then discusses candidates in a series of meetings throughout the year. At the end of the process, the committee presents one or more proposals to the full academy for a vote. The deliberations, including the names of nominees other than the winners, are kept confidential for 50 years.

On Tuesday, the physics prize went to French-Swedish physicist Anne L'Huillier, French scientist Pierre Agostini and Hungarian-born Ferenc Krausz for producing the first split-second glimpse into the superfast world of spinning electrons.

The tiny part of each atom races around the centre and is fundamental to virtually everything: chemistry, physics, our bodies and our gadgets.

On Monday, Hungarian-American Katalin Karik and American Drew Weissman won the Nobel Prize in medicine for discoveries that enabled the creation of mRNA vaccines against COVID-19.

Last year, Americans Carolyn R Bertozzi and K Barry Sharpless, and Danish scientist Morten Meldal were jointly awarded the Nobel Prize in chemistry for developing a way of  snapping molecules together that can be used to explore cells, map DNA and design drugs that can target diseases such as cancer more precisely.

The chemistry prize means Nobel season has reached its halfway stage. The prizes in literature, peace and economics follow, with one announcement every weekday until Oct 9.

The Nobel Foundation raised the prize money by 10% this year to 11 million kronor (about $1 million). In addition to the money, winners receive an 18-carat gold medal and diploma when they collect their Nobel Prizes at the award ceremonies in December.