Researchers at the University of Illinois Urbana-Champaign, working with the University of Notre Dame, have developed a micro-LED that set a speed record for its device type while consuming only 25 milliwatts. The information is CONFIRMED: the study was published in IEEE Electron Device Letters and publicised by the university.
The device reached an optical modulation bandwidth of 2.75 gigahertz — its light can respond to extremely rapid electrical changes. That figure describes the light source's response, not the data rate of a complete communication system.
The practical interest lies in data centers, where huge volumes of information move between nearby components, and short-distance optical links offer a way to carry data quickly without wasting energy. Lasers are often used for these links, but they need power and generate heat; LEDs offer another route, provided they respond fast enough.
The team worked with gallium nitride micro-LEDs with quantum wells — very thin layers that help confine the electrical charges involved in producing light. The researchers compared diameters from 100 micrometers down to just 2 micrometers and found the best balance not in the smallest device, but in one of 5 micrometers.
The record applies specifically to quantum-well LEDs, not to every kind of LED. Detailed modelling helped the team handle imperfections and unwanted electrical effects that slow performance. The small diameter could also allow many emitters to be arranged in compact arrays, each carrying a separate stream of information.
Even so, the experiment does not mean the device is ready to replace lasers or wiring in data centers. A practical link would need to integrate the transmitter with other components, and its real usefulness will depend on more than the performance of a single light source. The work serves as a roadmap for exploring more economical optical links.
Sources
Image credit: Micro-LED image released by The Grainger College of Engineering at the University of Illinois Urbana-Champaign, via Knowridge.
Transparency: this article was produced with the assistance of artificial intelligence, based on cross-checking public posts on X and sources on the internet. Readers are advised to consult the original sources to confirm details before making any decision.
Muse
