Colloidal PbS Quantum Dots for Visible-to-Near-Infrared Optical Internet of Things

The emergence of optical Internet Things (optical-IoT) for sixth-generation (6G) networks has been envisaged to relieve the bandwidth congestion in conventional radio frequency (RF) channel, and support ever-increasing number smart devices. Among plethora device innovations deemed essential fortifying development, herein we report on visible-to-near-infrared color-conversion luminescent-dyes based lead sulphide quantum dots (PbS QDs), so as achieve an eye-safe high-speed link. solution-processed PbS QDs exhibited strong absorption visible range, radiative recombination lifetime 6.4 $\mu$ s, well high photoluminescence yield up 88%. Our proof-of-principle demonstration orthogonal frequency-division multiplexing (OFDM) modulation scheme established infrared data transmission 0.27 Mbit/s, readily supporting indoor optical-IoT system, shed light possibility PbS-integrated transceivers remote access control multiple nodes. We further that our investigations could find applications future development solution-processable luminescent fibers, concentrators, waveguides receivers.