perovskite nanocrystals can achieve both illumination and data communication

- Apr 25, 2017-

Researchers at King Abdullah University of Technology have demonstrated that cesium-lead bromide perovskite nanocrystals can produce white light that can be used as a source of efficient lighting and ultra-fast data transmission.

 

The recently proposed Visible Light Communication (VLC) is a technology that has the potential to achieve both energy-efficient lighting and high-speed data communications using electromagnetic radiation at visible wavelengths (380-700 nm) rather than conventional radio frequency (RF) waves. In fact, VLC has several advantages over conventional RF-based communication systems, including high security, fast, and no need to adjust and not crowded bandwidth.

 

In a typical VLC system, the emitters use white LEDs with phosphors (blue, green and yellow / red color converters) or laser diodes (LDs) to generate white light for solid state light (SSL) and data communications. However, this limits the modulation bandwidth of the VLC system to phosphorus. That is, the long excited state lifetime of conventional yttrium aluminum garnet (YAG) -based phosphors (the time required to re-emit photons) poses a serious bottleneck in VLC applications. Thus, the bandwidth associated with the phosphor limits the VLC system to about 10 MHz and counteracts its key advantages over RF communication systems.

 

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


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