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

King Abdullah University of science and technology researchers have demonstrated that cesium lead bromide perovskite nanocrystals can produce white light, can be used as efficient lighting source 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 the conventional RF based communication system, VLC has several advantages, including high security, fast, and no need to adjust and not crowded bandwidth.

In a typical VLC system, the transmitter uses a phosphor (blue, green and yellow / red color converter) LED or laser diode (LD) to produce white light for solid-state light (SSL) and data communications. However, this makes the modulation bandwidth of VLC system limited by phosphorus. That is to say, the long excited state lifetime of conventional yttrium aluminum garnet (YAG) - based phosphors (the time required for re - emission of photons) is a serious bottleneck in VLC applications. Therefore, the bandwidth associated with the phosphor is limited to about 10MHz by the VLC system, and its key advantages relative to the RF communication system are eliminated.

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

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