29/05/2026
Researchers at the University of Cambridge have developed a new light-emitting system that could eventually improve cancer imaging, smartphone screens and low-energy computing.
The discovery emerged from a collaboration between St John’s physicist Dr Rakesh Arul (pictured) and chemists in the laboratory of Professor Akshay Rao, after they noticed an unexpected effect in molecules attached to microscopic particles containing rare-earth metals.
“We were seeing surprisingly bright emission from states that are normally considered optically dark,” said Dr Arul, Research Fellow.
“In the process of unravelling the mystery, we found that this bright emission came from a normally dark molecular state, the triplet, which is conventionally forbidden from emitting light via the rules of quantum mechanics.”
Researchers say the discovery could improve medical imaging because longer-lasting light signals are easier for scanners to distinguish from surrounding tissue. This could help doctors detect smaller tumours or track biological processes more accurately.
The same principle could also help reduce energy consumption in consumer electronics, which waste significant amounts of power.