A newly developed approach uses “molecular antennas” to direct electrical energy into nanoparticles that normally cannot conduct electricity. This advance has led to a completely new category of ultra-pure near-infrared LEDs designed for uses in medical diagnostics, optical communication systems, and sensing technologies.
Researchers at the Cavendish Laboratory, University of Cambridge have discovered a way to electrically activate insulating nanoparticles, something that had been considered unachievable under standard conditions. By attaching organic molecules that function like miniature antennas, the team successfully produced the first light-emitting diodes (LEDs) based on these particles. The findings, reported in Nature, introduce a pathway for next-generation devices that could support deep-tissue medical imaging and high-speed data transfer.
The research centers on lanthanide-doped nanoparticles (LnNPs), a group of materials known for generating extremely pure and stable light. Their emission is especially strong in the second near-infrared range, which can move through dense biological tissue. Despite these advantages, their lack of electrical conductivity has long prevented them from being integrated into electronic components such as LEDs.
“These nanoparticles are fantastic light emitters, but we couldn’t power them with electricity. It was a major barrier preventing their use in everyday technology,” said Professor Akshay Rao, who led the research at the Cavendish Laboratory. “We’ve essentially found a back door to power them. The organic molecules act like antennas, catching charge carriers and then ‘whispering’ it to the nanoparticle through a special triplet energy transfer process, which is surprisingly efficient.
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