It is found that perovskite nanocrystals can realize both illumination and data communication

Researchers at King Abdullah University of science and technology have shown that cesium, lead, bromide, perovskite nanocrystals can produce white light and can be used as efficient lighting sources and ultra fast data transmission.

Visible light communication recently proposed (VLC) is a promising and energy-efficient lighting and high speed data communication technology, the use of visible wavelength (380-700nm) electromagnetic radiation, rather than the conventional radio frequency (RF) wave communication. In fact, compared with conventional RF based communications systems, VLC has several advantages, including high security, fast, and no adjustment and congestion bandwidth.

In typical VLC systems, emitters use LED or laser diodes (LD) with phosphors (blue, green and yellow / red color converters) to produce white light for solid-state light (SSL) and data communications. However, this makes the modulation bandwidth of the VLC system limited by phosphorus. That is, the lifetime of the long excited state of the conventional yttrium aluminum garnet (YAG) based phosphor (the time required to re emit absorbed photons) poses a major bottleneck in VLC applications. Therefore, the phosphor related bandwidth limits the VLC system to about 10MHz, and offsets its key advantages relative to the RF communication system.

In recent years, perovskite has become a "magic" material for optoelectronic applications (photovoltaics and photodetectors). In addition, recent studies have revealed perovskite nanocrystals (NC) - in the form of cesium lead bromide - with relatively high photoluminescence quantum yield (PLQY) and short photoluminescence (PL) lifetime. In fact, this combination of high PLQY and short PL lifetime is ideal for basic requirements of SSL and VLC color converters.

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