Nobel Chemistry prize awarded for discovery of quantum dots that bring colour to LED lights

STOCKHOLM - Scientists Moungi Bawendi, Louis Brus and Alexei Ekimov won the 2023 Nobel Prize in Chemistry for their discovery of clusters of atoms known as quantum dots, now used to create colour in flat screens, light emitting diode (LED) lamps and devices that help surgeons see blood vessels in tumours.

The prize-awarding academy said the scientists had "added colour to nanotechnology" - when matter is used on an atomic or molecular level in manufacturing - and that their findings held great potential in many fields.

"Researchers believe that in the future they could contribute to flexible electronics, tiny sensors, thinner solar cells and encrypted quantum communication," the academy said in a statement.

The more than century-old prize is awarded by the Royal Swedish Academy of Sciences and is worth 11 million Swedish crowns (S$1.3 million).

Earlier on Wednesday (Oct 3), the academy appeared to have inadvertently published the names of the three scientists before the official announcement.

Asked during a press conference how he felt to hear news of his award, Bawendi said by phone from the United States: "very surprised, sleepy, shocked, unexpected and very honoured."

One of the "fascinating and unusual properties" of quantum dots is that they create different colour lights, depending on the particle size, while keeping the atomic structure unchanged, said Johan Aqvist, Chair of the Nobel Committee for Chemistry.

"There's a lot of work that's still being heavily researched on other potential applications including catalysis and quantum effects of all sorts," Bawendi told a news conference.

"It's a very exciting area of research. I'm sure something really interesting is going to come out this."

In the early 1980s, Ekimov discovered that the colour of glass changes with the size of copper chloride molecules contained in it and that sub-atomic forces were at play.

A few years later, Brus mad similar ground-breaking discoveries on the colour of fluids.

In 1993, Bawendi revolutionised the production of quantum dots, made up of clusters ranging from a few hundred to a few thousand atoms.

Bawendi is a professor at the Massachusetts Institute of Technology (MIT), Brus is professor emeritus at Columbia University and Ekimov works for Nanocrystals Technology Inc.

Brus was hired by AT&T Bell Labs in 1972 where he spent 23 years, devoting much of the time to studying nanocrystals.

Bawendi was born in Paris and grew up in France, Tunisia, and the U.S. Bawendi did his postdoctoral research under Brus then joined MIT in 1990 and became professor in 1996.

Ekimov was born in the Soviet Union worked for the Vavilov State Optical Institute before moving to the United States. In 1999, Ekimov was named chief scientist at Nanocrystals Technology Inc.

The third of this year's crop of awards, the chemistry Nobel follows those for medicine and physics announced earlier this week.

Established in the will of Swedish dynamite inventor and chemist Alfred Nobel, the prizes for achievements in science, literature and peace have been awarded since 1901 with a few interruptions, primarily due to the world wars.

The economics prize is a later addition funded by the Swedish central bank.

While the chemistry awards are sometimes overshadowed by the physics prize and its famous winners such as Albert Einstein, chemistry laureates include many scientific greats, including radioactivity pioneer Ernest Rutherford and Marie Curie, who also won the physics prize.

Last year's chemistry award went to scientists Carolyn Bertozzi, Morten Meldal and Barry Sharpless for pioneering work in "click chemistry", discovering reactions that let molecules snap together to create new compounds.

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