Cambridge University develops new generation of ultra-pure near-infrared LEDs

Recently, scientists at the Cavendish Laboratory of the University of Cambridge announced the results of a research on LED technology. They used "molecular antennas" to successfully introduce electrical energy into insulating nanoparticles, thereby developing a new ultra-pure near-infrared LED. This discovery breaks the traditional understanding that insulating materials cannot be directly energized and emit light, and brings new application prospects to fields such as medical diagnosis, optical communications, and high-sensitivity detection.



It is reported that Lanthanide-doped nanoparticles (LnNPs) have long been favored by the scientific community due to their extremely high luminescence purity and stability, especially in the second near-infrared window band that can penetrate deeply into biological tissues.

However, this type of material is essentially an insulator and cannot be directly energized like a semiconductor, which has become a major obstacle to its application in daily electronic devices. In order to overcome this problem , the research team designed an "organic-inorganic hybrid" structure and attached an organic molecule called 9-anthracenecarboxylic acid (9-ACA) to the surface of the insulating nanoparticles.

When energized, these organic molecules act as miniature "antennas" to receive charges, and through a special "triplet energy transfer" mechanism, transfer energy to the nanoparticles inside with an efficiency of more than 98%, thereby driving them to emit light.

This new type of LED demonstrates high performance advantages, requires only a low voltage of about 5 volts to start, and produces an extremely narrow spectrum with a light purity that far exceeds many existing technologies, including quantum dots. The researchers pointed out that this ultra-pure near-infrared light source is ideal for biomedical sensing and can significantly reduce signal interference and achieve more accurate data transmission.

The application potential of this technology is very broad. In the future, this kind of micro LED is expected to be implanted in wearable devices or even injected into the human body to track organ function in real time, accurately locate cancer cells, or trigger light-activated drugs. < br />
Although the technology is still in the early stages of research and development, the research team said that this achievement unlocks a new class of materials for optoelectronics. With further exploration of the combination of organic molecules and insulating nanomaterials, scientists are expected to create next-generation electronic devices with superior performance and more customized functions.