2G per second! The new hybrid phosphor Li-Fi speed 40 times
According to the researchers' conclusion, LED-based data transfer can be as fast as 40 times faster if manufacturers change the design of phosphors (which convert LEDs from blue to white).
A team of scientists at King Abdullah University of Saudi Arabia found that a color converter capable of supporting visible light communication (VLC) modulation at a rate close to 500 MHz, built with a combination of red phosphor and perovskite nanocrystals, claims that this 40 times faster than traditional phosphor materials.
VLC uses non-visible light modulation in LED light waves and transmits data via light waves.
This Li-Fi-enabled technology replaces wireless-based Wi-Fi technology with light to enable wireless Internet transmission.
It is also one of several positioning system technologies based on indoor lighting that helps people, products and assets in factories, stores, workplaces and other environments track.
The red phosphor and perovskite materials are much faster to tune than traditional YAG phosphors because of their shorter "lifetime in excited state," the researchers said.
Perovskites are potential minerals that can improve the performance of a range of products including LEDs, solar cells, and photodetectors.
"Traditional lighting phosphors, which are usually integrated with LEDs with limited modulation bandwidth, do not provide enough bandwidth to unlock the potential of VLC." The article is published in ACS Photonics magazine. "In this work, we demonstrate a highly advanced VLC photoconverter that is solution processed with conventional red phosphor using CsPbBr3 perovskite-type composite oxide nanocrystals (NCS)." The resulting CsPbBr3NC The white phosphor-based converter has an unprecedented modulation bandwidth of 491 MHz, about 40 times faster than conventional phosphors. "
The science team described that perovskite materials support data rates of up to 2 Gb / s, but the paper does not say whether this speed is 40 times faster than VLC with existing phosphors. But according to Phys.org, 2G is significantly faster per second than Wi-Fi with "just a few tens of megabits per second."
Proponents of Li-Fi and VLC technology say this is a huge improvement for wireless communications because the spectrum of visible light is 10,000 times larger than the radio spectrum. They also said it has a higher data density than Wi-Fi and is less susceptible to electromagnetic interference. However, its effective range is shorter than Wi-Fi.
Li-Fi may become an important artery in the Internet of Things. Last spring, Deutsche Telekom Research Institute, HHI, demonstrated how to remotely inspect cars in a car plant with Li-Fi.
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