Visible light communication system developed with 40x more bandwidth by adding perovskite nanocrystals

06/15/2016 - 18:34

Lisa Zyga

Cell phones and Wi-Fi devices typically transmit data using radio waves, but as the demand for wireless data transfer increases, congestion in the radio spectrum is expected to become more of a problem. One way to solve this problem is with visible light communication (VLC), a technology that uses visible light rather than radio waves for data transmission.

VLC uses lasers or LEDs that look just like traditional lights, but by rapidly switching on and off faster than the eye can see, the light transmits data in binary code to a receiver.


Ref: Perovskite Nanocrystals as a Color Converter for Visible Light Communication. ACS Photonics (31 May 2016) | DOI: 10.1021/acsphotonics.6b00187


Visible light communication (VLC) is an emerging technology that uses light-emitting diodes (LEDs) or laser diodes for simultaneous illumination and data communication. This technology is envisioned to be a major part of the solution to the current bottlenecks in data and wireless communication. However, the conventional lighting phosphors that are typically integrated with LEDs have limited modulation bandwidth and thus cannot provide the bandwidth required to realize the potential of VLC. In this work, we present a promising light converter for VLC by designing solution-processed CsPbBr3 perovskite nanocrystals (NCs) with a conventional red phosphor. The fabricated CsPbBr3 NC phosphor-based white light converter exhibits an unprecedented modulation bandwidth of 491 MHz, which is ∼40 times greater than that of conventional phosphors, and the capability to transmit a high data rate of up to 2 Gbit/s. Moreover, this perovskite-enhanced white light source combines ultrafast response characteristics with a high color rendering index of 89 and a correlated color temperature of 3236 K, thereby enabling dual VLC and solid-state lighting functionalities.