Perovskites LEDs aim for gigabit LiFi

Perovskites LEDs aim for gigabit LiFi

Technology News |
By Nick Flaherty

European researchers have developed perovskite LEDs on silicon that could reach gigabit speeds using low cost perovskite materials.

The joint team of researchers from ten labs investigated how to release high-speed photonic sources using a metal-halide perovskite material on silicon for gigabit LiFi light communication.

Although research has progressed substantially in optimizing their external quantum efficiency, the modulation characteristics of perovskite LEDs remain unclear. The fast perovskite photonic sources on silicon based on tailoring alkylammonium cations in perovskite systems.

The team integrated a Fabry–Pérot microcavity on the silicon to show perovskite devices with efficient modulation bandwidths of up to 42.6 MHz and data rates above 50 Mbps, with further analysis suggesting that the bandwidth may exceed gigahertz levels. The principles developed here will support the development of perovskite light sources for next-generation data-communication architectures. The demonstration of solution-processed perovskite emitters on silicon substrates also opens up the possibility of integration with micro-electronics platforms.

This involved researchers from Surry, Cambridge, Bath, Warwick, UCL, EMPA and UESTC.

“Billions of IoT connected devices have the potential to add significant value to industry and the global economy. In this market costs and compatibility are often prioritised over data transmission speed and scientists are looking for alternative ways to reduce energy consumption per bit and improve compactness while simultaneously working on improving the speed of data connection,” said Dr Wei Zhang, lead corresponding author of the study and associate professor at University of Surrey’s Advanced Technology Institute.

“In our study we have made a huge leap forward and shown how metal-halide perovskites could provide a cost-efficient and powerful solution to make LEDs which have enormous potential to increase their bandwidths into the gigahertz levels. The insights gained from this research will undoubtedly shape the future of data communication.”

“Moreover, our investigations will accelerate the development of high-speed perovskite photodetectors and continuous wave pumped perovskite lasers, thus opening up new avenues for advancements in optoelectronic technologies.”

“We provided the first study to elucidate the mechanisms behind achieving high-speed perovskite LEDs, which represents a significant step toward the realisation of perovskite light sources for next-generation data communications,” said Hao Wang, co-first author and Ph.D. student at the University of Cambridge.

“The ability to achieve solution-processed perovskite emitters on silicon substrates also paves the way for their integration with micro-electronics platforms, presenting new opportunities for seamless integration and advancement in the field of data communications.”;



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